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BEGIN:VEVENT
SUMMARY:Soft Gluon Resummation for Dijet Process
DTSTART;VALUE=DATE-TIME:20211118T164000Z
DTEND;VALUE=DATE-TIME:20211118T170000Z
DTSTAMP;VALUE=DATE-TIME:20220119T053700Z
UID:indico-contribution-111797@indico.desy.de
DESCRIPTION:Speakers: Feng Yuan (Lawrence Berkeley National Laboratory)\n
In this talk\, we will present our results on the soft gluon resummation i
n the dijet production processes where the total transverse momentum of th
e dijet is much smaller than the jet momentum.\nhttps://indico.desy.de/eve
nt/28334/contributions/111797/
URL:https://indico.desy.de/event/28334/contributions/111797/
END:VEVENT
BEGIN:VEVENT
SUMMARY:T-odd transverse-momentum-dependent gluon distributions in a spect
ator model
DTSTART;VALUE=DATE-TIME:20211116T153000Z
DTEND;VALUE=DATE-TIME:20211116T155000Z
DTSTAMP;VALUE=DATE-TIME:20220119T053700Z
UID:indico-contribution-111974@indico.desy.de
DESCRIPTION:Speakers: Alessandro Bacchetta (University of Pavia and INFN)\
, Marco Radici (INFN - Pavia)\, Francesco Giovanni Celiberto (ECT*/FBK Tre
nto & INFN-TIFPA)\nWe perform explorative analyses of the 3D gluon content
of the proton via a study of polarized T-odd gluon TMDs at leading twist\
, calculated in a spectator model for the parent nucleon. Our approach enc
odes a flexible parametrization for the spectator-mass density\, suited to
describe both moderate and small-x effects. All these prospective develop
ments are relevant in the investigation of the gluon dynamics inside nucle
ons and nuclei\, which constitutes one of the major goals of new-generatio
n colliding machines\, as the Electron-Ion Collider\, the High-Luminosity
LHC\, NICA-SPD\, and the Forward Physics Facility.\nhttps://indico.desy.de
/event/28334/contributions/111974/
URL:https://indico.desy.de/event/28334/contributions/111974/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Determination of the Collins-Soper Kernel from Lattice QCD via mom
ents of quasi-TMDs
DTSTART;VALUE=DATE-TIME:20211116T140000Z
DTEND;VALUE=DATE-TIME:20211116T142000Z
DTSTAMP;VALUE=DATE-TIME:20220119T053700Z
UID:indico-contribution-110946@indico.desy.de
DESCRIPTION:Speakers: Maximilian Schlemmer\nWe present lattice results for
the non-perturbative Collins-Soper (CS) kernel\, which describes the ener
gy-dependence of transverse momentum-dependent parton distributions (TMDs)
. The CS kernel is extracted from the ratios of first Mellin moments of qu
asi-TMDs evaluated at different nucleon momenta.\nThe analysis is done wit
h dynamical $N_f=2+1$ clover fermions for the CLS ensemble H101 ($a=0.0854
\\\,\\mathrm{fm}$\, $m_{\\pi}=m_K=422\\\,\\mathrm{MeV}$). The computed CS
kernel is in good agreement with experimental extractions and previous lat
tice studies.\nhttps://indico.desy.de/event/28334/contributions/110946/
URL:https://indico.desy.de/event/28334/contributions/110946/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Azimuthal correlations in Z+jet events
DTSTART;VALUE=DATE-TIME:20211116T170000Z
DTEND;VALUE=DATE-TIME:20211116T172000Z
DTSTAMP;VALUE=DATE-TIME:20220119T053700Z
UID:indico-contribution-112229@indico.desy.de
DESCRIPTION:Speakers: Heng Yang (CMS (CMS Fachgruppe QCD))\, Qun Wang (DES
Y)\, Hannes Jung (DESY)\, Armando Bermudez Martinez (CMS (CMS Fachgruppe Q
CD))\, Mikel Mendizabal Morentin (DESY)\nWe present a measurement of azimu
thal correlations in Z+jet events measured by CMS at sqrt{s}=13 TeV. The m
easurements are compared to predictions at NLO using Pythia8 parton shower
and hardonization as well as Parton Branching TMDs and TMD shower.\nPredi
ctions are given for the back-to-back configuration and a comparison of th
e prediction with measurements of multi-jets in the same kinematic range i
s shown.\nhttps://indico.desy.de/event/28334/contributions/112229/
URL:https://indico.desy.de/event/28334/contributions/112229/
END:VEVENT
BEGIN:VEVENT
SUMMARY:TMD extraction and PDF bias problem
DTSTART;VALUE=DATE-TIME:20211118T150000Z
DTEND;VALUE=DATE-TIME:20211118T152000Z
DTSTAMP;VALUE=DATE-TIME:20220119T053700Z
UID:indico-contribution-112230@indico.desy.de
DESCRIPTION:Speakers: Ignazio Scimemi\nThe extraction of TMD PDF includes
PDF as input. In some recent extractions we have observed how the quality
of the extraction depends on the selected PDF set. We show here how this p
roblem\, the PDF bias\, is solved with a flavor dependent model for the no
n-perturbative TMD input.\nhttps://indico.desy.de/event/28334/contribution
s/112230/
URL:https://indico.desy.de/event/28334/contributions/112230/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Transverse momentum dependent distributions in dijet and heavy had
ron pair production at EIC
DTSTART;VALUE=DATE-TIME:20211117T153000Z
DTEND;VALUE=DATE-TIME:20211117T155000Z
DTSTAMP;VALUE=DATE-TIME:20220119T053700Z
UID:indico-contribution-112231@indico.desy.de
DESCRIPTION:Speakers: Rafael F. del Castillo (Universidad Complutense de M
adrid)\nWe discuss the measurement of gluon transverse momentum distributi
on (TMD) in dijet and heavy hadron pair (HHP) production in semi-inclusive
deep inelastic scattering. The factorization of these processes in impact
parameter space shows the appearance of a specific new soft factor matrix
element on top of angular a complex valued anomalous dimensions. We show
in detail how these features can be treated consistently and we discuss a
scale prescription for the evolution kernel of the dijet soft function. A
s a result\, we obtain phenomenological predictions for unpolarized and an
gular modulated cross sections for the electron-ion collider (EIC) using c
urrent available information on unpolarized TMD.\nhttps://indico.desy.de/e
vent/28334/contributions/112231/
URL:https://indico.desy.de/event/28334/contributions/112231/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Jet production and TMD evolution
DTSTART;VALUE=DATE-TIME:20211118T160000Z
DTEND;VALUE=DATE-TIME:20211118T162000Z
DTSTAMP;VALUE=DATE-TIME:20220119T053700Z
UID:indico-contribution-112744@indico.desy.de
DESCRIPTION:Speakers: Armando Bermudez Martinez (CMS (CMS Fachgruppe QCD))
\nWe investigate the TMD evolution contribution to jet production. Calcula
tions of jet production at the LHC using the TMD merging method are presen
ted. The predictions show very good agreement with the data over a wide ki
nematic range. Lower matching cone radii are preferred by jet events than
Z + jets events.\nhttps://indico.desy.de/event/28334/contributions/112744/
URL:https://indico.desy.de/event/28334/contributions/112744/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Azimuthal correlations in high pt dijet events with PB TMDs
DTSTART;VALUE=DATE-TIME:20211118T162000Z
DTEND;VALUE=DATE-TIME:20211118T164000Z
DTSTAMP;VALUE=DATE-TIME:20220119T053700Z
UID:indico-contribution-112309@indico.desy.de
DESCRIPTION:Speakers: Armando Bermudez Martinez (CMS (CMS Fachgruppe QCD))
\, Hannes Jung (DESY)\, Qun Wang (DESY)\nWe present a comparison of predic
tions obtained with PB TMDs (MG5-aMC+CA3(jj)NLO) with measurements in the
back-to-back region.\n\nThe presentation is a result of the PB-TMD Monte C
arlo school.\n\nThe speaker will be selected from the participants of the
PB-TMD school.\nhttps://indico.desy.de/event/28334/contributions/112309/
URL:https://indico.desy.de/event/28334/contributions/112309/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Precision measurements using soft drop jet mass
DTSTART;VALUE=DATE-TIME:20211119T130000Z
DTEND;VALUE=DATE-TIME:20211119T132000Z
DTSTAMP;VALUE=DATE-TIME:20220119T053700Z
UID:indico-contribution-111670@indico.desy.de
DESCRIPTION:Speakers: Aditya Pathak (University of Manchester)\nSoft drop
jet mass is an attractive candidate for precision measurements such as the
top mass $m_t$ and the strong coupling constant $\\alpha_s$\, as it can b
e perturbatively calculable to high accuracy besides being more robust aga
inst nonperturbative and underlying event corrections. In this talk I will
describe the prospects for the top mass and $\\alpha_s$-determination at
the LHC using soft drop jet mass by combining state-of-the-art resummed pr
edictions with a field theoretic treatment of nonperturbative power correc
tions. I will show that the observable is promising for $m_t$ measurement
in a definite top mass scheme with ${\\cal O}(1)$ GeV uncertainty. On the
other hand\, the dominant uncertainty in the $\\alpha_s$-determination is
limited by nonperturbative corrections\, and for measurements on $p_T \\ge
q 1$ TeV\, is saturated to about 2%.\nhttps://indico.desy.de/event/28334/c
ontributions/111670/
URL:https://indico.desy.de/event/28334/contributions/111670/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Recent results on extractions of quark TMDs
DTSTART;VALUE=DATE-TIME:20211118T152000Z
DTEND;VALUE=DATE-TIME:20211118T154000Z
DTSTAMP;VALUE=DATE-TIME:20220119T053700Z
UID:indico-contribution-112838@indico.desy.de
DESCRIPTION:Speakers: Alessandro Bacchetta (University of Pavia and INFN)\
nWe review the recent progress on the extraction of TMD PDFs and TMD FFs f
rom global data of Semi-Inclusive Deep-Inelastic Scattering\, Drell-Yan an
d Z boson production. Particular attention will be devoted to the effects
of the increase in theoretical accuracy.\nhttps://indico.desy.de/event/283
34/contributions/112838/
URL:https://indico.desy.de/event/28334/contributions/112838/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Track functions and TMD physics
DTSTART;VALUE=DATE-TIME:20211118T130000Z
DTEND;VALUE=DATE-TIME:20211118T132000Z
DTSTAMP;VALUE=DATE-TIME:20220119T053700Z
UID:indico-contribution-110943@indico.desy.de
DESCRIPTION:Speakers: Wouter Waalewijn (University of Amsterdam / Nikhef)\
nI will talk about track functions and TMD physics.\nhttps://indico.desy.d
e/event/28334/contributions/110943/
URL:https://indico.desy.de/event/28334/contributions/110943/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Measurements of the Z boson production at ATLAS
DTSTART;VALUE=DATE-TIME:20211115T164000Z
DTEND;VALUE=DATE-TIME:20211115T170000Z
DTSTAMP;VALUE=DATE-TIME:20220119T053700Z
UID:indico-contribution-112410@indico.desy.de
DESCRIPTION:Speakers: Aleksei Ezhilov (ATLAS)\nPrecision measurements of
the Drell-Yan process at LHC provide most precise tests of perturbative Q
CD and information about the parton distribution functions for quarks with
in the proton. We present the measurement of the transverse momentum and p
histart_eta distributions of Drell-Yan lepton pairs at 13 TeV. The measure
ment is corrected for detector inefficiency and resolution and compared wi
th state-of-the-art theoretical calculations. A summary of similar measure
ments at 7 and 8 TeV is also presented.\nhttps://indico.desy.de/event/2833
4/contributions/112410/
URL:https://indico.desy.de/event/28334/contributions/112410/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Intrinsic kt and DY production at different masses and energies
DTSTART;VALUE=DATE-TIME:20211115T140000Z
DTEND;VALUE=DATE-TIME:20211115T142000Z
DTSTAMP;VALUE=DATE-TIME:20220119T053700Z
UID:indico-contribution-112228@indico.desy.de
DESCRIPTION:Speakers: Armando Bermudez Martinez (CMS (CMS Fachgruppe QCD))
\, Mikel Mendizabal Morentin (DESY)\, Hannes Jung (CMS (CMS Fachgruppe QCD
))\nWe present a study of intrinsic kt effects in DY production from very
low DY masses up to the Z-boson mass\, covering a large range of center-of
-mass energies from \\sqrt{s} = 40 GeV up to LHC energies.\nThe descriptio
n of measurements from different experiments is studied with MCatNLO suppl
emented with Pythia8 as well as with Parton Branching TMDs.\nAn energy dep
endent intrinsic kt width is needed to described the measurements when Pyt
hia8 is used\, while a fixed intrinsic kt width works with PB TMDs.\nhttps
://indico.desy.de/event/28334/contributions/112228/
URL:https://indico.desy.de/event/28334/contributions/112228/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Parton showers and PDFs ⊕ N3LO preview
DTSTART;VALUE=DATE-TIME:20211115T130000Z
DTEND;VALUE=DATE-TIME:20211115T132000Z
DTSTAMP;VALUE=DATE-TIME:20220119T053700Z
UID:indico-contribution-112553@indico.desy.de
DESCRIPTION:Speakers: Stefan Prestel (Lund University)\nhttps://indico.des
y.de/event/28334/contributions/112553/
URL:https://indico.desy.de/event/28334/contributions/112553/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Determining Transverse Momentum Dependent Parton Distribution Func
tions with Monte Carlo generators
DTSTART;VALUE=DATE-TIME:20211115T134000Z
DTEND;VALUE=DATE-TIME:20211115T140000Z
DTSTAMP;VALUE=DATE-TIME:20220119T053700Z
UID:indico-contribution-112351@indico.desy.de
DESCRIPTION:Speakers: Yuchen Zhou (CMS (CMS Fachgruppe QCD))\, Suzanne Ste
el (None)\, Sara Taheri Monfared (DESY)\, Hannes Jung (CMS (CMS Fachgruppe
QCD))\nTransverse Momentum Dependent (TMD) parton distribution is a very
powerful concept for the description of low and high transverse momentum e
ffects in high energy collisions. The Parton Branching (PB) method provide
s TMD distributions that can be used in parton shower simulations\, as alr
eady implemented in CASCADE Monte Carlo event generator. \nWe develop a me
thod\, PS2TMD\, that allows determining effective TMDs from the standard M
onte Carlo parton showers. This method is validated and implemented to suc
cessfully reconstruct the PB-TMDs with different configuration settings. W
e also discuss kinematic shifts in longitudinal momentum distributions fro
m initial state showering and point out the sizable influence of different
reconstruction definitions on both collinear and transverse momentum PDFs
.\nhttps://indico.desy.de/event/28334/contributions/112351/
URL:https://indico.desy.de/event/28334/contributions/112351/
END:VEVENT
BEGIN:VEVENT
SUMMARY:TMDPDFs and TMDFFs at N3LO for N3LL' Resummation
DTSTART;VALUE=DATE-TIME:20211116T161000Z
DTEND;VALUE=DATE-TIME:20211116T163000Z
DTSTAMP;VALUE=DATE-TIME:20220119T053700Z
UID:indico-contribution-111661@indico.desy.de
DESCRIPTION:Speakers: Gherardo Vita (SLAC)\nIn this talk I discuss the cal
culation at N$^3$LO of the quark and gluon unpolarized $q_T$ Beam Function
s and of the TMD Fragmentation Functions. I illustrate their role in the r
esummation of QCD observables at N3LL'\, such as $q_T$ distributions and E
nergy Energy Correlators. The matching kernels onto standard PDFs or FFs o
f these collinear gauge invariant objects can be obtained from the colline
ar expansion of differential partonic cross sections at the LHC\, which we
have calculate at N$^3$LO for both Drell-Yan and Higgs production in gluo
n fusion. I conclude by presenting the results for the N3LO EEC Jet Functi
on and the resummation at N3LL' of the EEC in the back-to-back limit.\nhtt
ps://indico.desy.de/event/28334/contributions/111661/
URL:https://indico.desy.de/event/28334/contributions/111661/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Closing talk
DTSTART;VALUE=DATE-TIME:20211119T153000Z
DTEND;VALUE=DATE-TIME:20211119T160000Z
DTSTAMP;VALUE=DATE-TIME:20220119T053700Z
UID:indico-contribution-113228@indico.desy.de
DESCRIPTION:Speakers: Pierre Van Mechelen (U Antwerp)\nhttps://indico.desy
.de/event/28334/contributions/113228/
URL:https://indico.desy.de/event/28334/contributions/113228/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Dynamical resolution scale fits for TMDs at Next-to-Leading-Order
(NLO)
DTSTART;VALUE=DATE-TIME:20211116T155000Z
DTEND;VALUE=DATE-TIME:20211116T161000Z
DTSTAMP;VALUE=DATE-TIME:20220119T053700Z
UID:indico-contribution-112234@indico.desy.de
DESCRIPTION:Speakers: Ola Lelek (University of Antwerp)\, Francesco Hautma
nn (University of Antwerp\, University of Oxford)\, Lissa Keersmaekers (Un
iversity of Antwerp)\, Safura Sadeghi Barzani (University of Antwerp\, Sha
hid Beheshti University)\, Sara Taheri Monfared (DESY)\nThe parton-branchi
ng solutions of QCD evolution equations have been recently\nstudied. From
this approach\, a method to construct both collinear and transverse\nmomen
tum dependent (TMD) parton densities has been formulated. In this\nformali
sm\, soft-gluon color coherence effects are taken into account by\nintrodu
cing the soft-gluon resolution scale. Both analytical studies and\nnumeric
al solutions of PB evolution equations in the presence of dynamical\nresol
ution scales at Leading-Order (LO) in the strong coupling have been\nprese
nted. In this talk\, we show preliminary results of fits to the high-preci
sion\ndeep inelastic scattering (DIS) structure-function measurements rega
rding the\nimplications of dynamical resolution scales at Next-to-Leading-
Order (NLO)\naccuracy in the strong coupling. We also illustrate the diffe
rence between LO\nand NLO distributions fits.\nhttps://indico.desy.de/even
t/28334/contributions/112234/
URL:https://indico.desy.de/event/28334/contributions/112234/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Helicity Evolution at Small x: the Single-Logarithmic Contribution
DTSTART;VALUE=DATE-TIME:20211117T140000Z
DTEND;VALUE=DATE-TIME:20211117T142000Z
DTSTAMP;VALUE=DATE-TIME:20220119T053700Z
UID:indico-contribution-112409@indico.desy.de
DESCRIPTION:Speakers: Yossathorn Tawabutr (The Ohio State University)\, An
drey Tarasov (The Ohio State University)\, Yuri Kovchegov (The Ohio State
University)\nWe calculate single-logarithmic corrections to the small-$x$
flavor-singlet helicity evolution equations derived previously at the doub
le-logarithmic approximation. The new single-logarithmic part of the evolu
tion kernel sums up powers of $\\alpha_s\\ln(1/x)$\, which are an importan
t correction to the dominant powers of $\\alpha_s\\ln^2(1/x)$ summed up pr
eviously by the double-logarithmic kernel at small values of Bjorken $x$ a
nd with $\\alpha_s$ the strong coupling constant. The single-logarithmic t
erms arise separately from either the longitudinal or transverse momentum
integrals. Consequently\, the evolution equations we derive not only inclu
de the small-$x$ evolution kernel\, but they also coincide in assumptions
with the leading-order polarized DGLAP splitting functions. We further enh
ance the equations by calculating the running coupling corrections to the
kernel.\nhttps://indico.desy.de/event/28334/contributions/112409/
URL:https://indico.desy.de/event/28334/contributions/112409/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Transverse momentum distributions in low-mass Drell-Yan lepton pai
r production at NNLO QCD
DTSTART;VALUE=DATE-TIME:20211115T172000Z
DTEND;VALUE=DATE-TIME:20211115T174000Z
DTSTAMP;VALUE=DATE-TIME:20220119T053700Z
UID:indico-contribution-112421@indico.desy.de
DESCRIPTION:Speakers: Aude Gehrmann-De Ridder (ETH Zurich)\, Adrian Rodrig
uez Garcia (ETH Zurich)\, Nigel Glover (Durham University)\, Alexander Hus
s (CERN)\, Imre Majer (ETH Zurich)\, Rhorry Gauld (University of Bonn)\,
Thomas Gehrmann (University of Zurich)\nThe production of lepton pairs at
low invariant mass and finite transverse momentum resolves QCD dynamics at
the boundary between the perturbative and non-perturbative domains. We in
vestigate the impact of NNLO QCD corrections for the lepton pair transvers
e momentum distributions at energies corresponding to the BNL RHIC collide
r and to fixed-target experiments. Satisfactory perturbative convergence i
s observed in both cases. Only the collider data are found to be well-desc
ribed by perturbative QCD.\nhttps://indico.desy.de/event/28334/contributio
ns/112421/
URL:https://indico.desy.de/event/28334/contributions/112421/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Introduction
DTSTART;VALUE=DATE-TIME:20211115T124000Z
DTEND;VALUE=DATE-TIME:20211115T130000Z
DTSTAMP;VALUE=DATE-TIME:20220119T053700Z
UID:indico-contribution-106827@indico.desy.de
DESCRIPTION:Speakers: Hannes Jung (CMS (CMS Fachgruppe QCD))\nOnline\nhttp
s://indico.desy.de/event/28334/contributions/106827/
URL:https://indico.desy.de/event/28334/contributions/106827/
END:VEVENT
BEGIN:VEVENT
SUMMARY:A Monte-Carlo Simulation of Double Parton Scattering
DTSTART;VALUE=DATE-TIME:20211115T151000Z
DTEND;VALUE=DATE-TIME:20211115T153000Z
DTSTAMP;VALUE=DATE-TIME:20220119T053700Z
UID:indico-contribution-110244@indico.desy.de
DESCRIPTION:Speakers: Jonathan Gaunt (University of Manchester)\nDouble pa
rton scattering (DPS) is the process in which one has two separate hard sc
atterings in an individual proton-proton collision. In recent years much p
rogress has been made towards the proper description of this phenomenon in
QCD\, including a consistent description of perturbative splittings that
yield the parton pair in one or both protons\, and a coherent framework fo
r combining both double and single scattering without double counting. How
ever\, phenomenological predictions for DPS are often made using Monte Car
lo codes or the "pocket formula"\, which are based on a simple picture of
two uncorrelated scatters. I describe the development of a new Monte Carlo
simulation for DPS\, dShower\, that is based on the modern theoretical pi
cture. The structure of the DPS shower will be discussed\, as well as the
procedure to combine this shower with an SPS shower such that one can simu
late both processes without double counting.\nhttps://indico.desy.de/event
/28334/contributions/110244/
URL:https://indico.desy.de/event/28334/contributions/110244/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The Collins-Soper kernel from lattice QCD via quasi TMDPDFs
DTSTART;VALUE=DATE-TIME:20211116T134000Z
DTEND;VALUE=DATE-TIME:20211116T140000Z
DTSTAMP;VALUE=DATE-TIME:20220119T053700Z
UID:indico-contribution-110245@indico.desy.de
DESCRIPTION:Speakers: Phiala Shanahan (MIT)\, Yong Zhao\, Michael Wagman\n
I will describe recent lattice QCD determinations of the nonperturbative C
ollins-Soper kernel\, which describes the rapidity evolution of quark tran
sverse-momentum-dependent parton distribution functions. It is found that
different approaches to extract the Collins-Soper kernel from the same und
erlying lattice QCD matrix elements yield significantly different results
and uncertainty estimates\, revealing that power corrections\, such as tho
se associated with higher-twist effects\, and perturbative matching betwee
n quasi and light-cone beam functions\, cannot be neglected. I will discus
s the implications of these observations for future controlled calculation
s of this quantity\, and what will be required to achieve them.\nhttps://i
ndico.desy.de/event/28334/contributions/110245/
URL:https://indico.desy.de/event/28334/contributions/110245/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Jet-based TMD measurements with H1 data and machine-learning unfo
lding
DTSTART;VALUE=DATE-TIME:20211117T163000Z
DTEND;VALUE=DATE-TIME:20211117T165000Z
DTSTAMP;VALUE=DATE-TIME:20220119T053700Z
UID:indico-contribution-110246@indico.desy.de
DESCRIPTION:Speakers: Miguel Arratia (University of California\, Riverside
)\nRecently\, jet measurements in deep-inelastic scattering (DIS) events c
lose to Born kinematics have been proposed as a new probe to study transve
rse-momentum-dependent (TMD) PDFs\, TMD fragmentation functions\, and TMD
evolution. In this talk\, I will report measurements of lepton-jet momentu
m imbalance in high-Q2 DIS events collected with the H1 detector at HERA.
These data bridge DIS measurements from fixed target experiments and Dr
ell-Yan measurements at colliders\, thus providing a stringent test of TMD
factorization\, evolution and universality. This measurement also represe
nts the first example of unfolding assisted with machine learning. These r
esults serve as a pathfinder for the Electron-Ion Collider jet-based 3D im
aging program\, which I will describe briefly.\nhttps://indico.desy.de/eve
nt/28334/contributions/110246/
URL:https://indico.desy.de/event/28334/contributions/110246/
END:VEVENT
BEGIN:VEVENT
SUMMARY:DPDs in colour space: perturbative splitting and positivity
DTSTART;VALUE=DATE-TIME:20211115T155000Z
DTEND;VALUE=DATE-TIME:20211115T161000Z
DTSTAMP;VALUE=DATE-TIME:20220119T053700Z
UID:indico-contribution-111976@indico.desy.de
DESCRIPTION:Speakers: Peter Josef Ploessl (T (Phenomenology))\nDouble part
on scattering (DPS) - the situation where two individual hard interactions
happen during a single hadron-hadron collision - is sensitive to all sort
s of correlations between two partons inside a hadron\, e.g.~spin\, colour
\, or spatial separation. Therefore DPS gives access to information about
hadron structure not accessible in single parton scattering (SPS). This in
formation is encoded in double parton distributions (DPDs) which are the D
PS counterpart of PDFs in SPS.\nAt small inter-parton distances the leadin
g contribution to DPDs is due to a perturbative splitting mechanism\, whic
h makes it possible to calculate DPDs in perturbation theory in this regim
e. We compute the unpolarized perturbative splitting DPDs at next-to-leadi
ng order (NLO) for all possible colour correlations and study their numeri
cal importance compared to the leading order (LO) splitting DPDs.\nWith th
ese NLO splitting DPDs we can show that positivity bounds for colour space
DPDs can be violated. We furthermore find that even at LO positivity can
be violated by evolution from lower to higher scales\, in contrast to the
situation for ordinary PDFs.\nhttps://indico.desy.de/event/28334/contribut
ions/111976/
URL:https://indico.desy.de/event/28334/contributions/111976/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The differential cross section of the single inclusive e+ e- annih
ilation to the hadrons via gamma-production\, in the different k_t-factor
ization frameworks
DTSTART;VALUE=DATE-TIME:20211118T142000Z
DTEND;VALUE=DATE-TIME:20211118T144000Z
DTSTAMP;VALUE=DATE-TIME:20220119T053700Z
UID:indico-contribution-111977@indico.desy.de
DESCRIPTION:Speakers: Majid Modarres (University of Tehran)\, Roghieh Tagh
avi (University of Tehran)\nFor the first time\, we study the differential
cross section of the single inclusive ${e^ + }{e^ - }$ annihilation to t
he hadrons via $\\gamma$-production\, in the different ${k_{t}}$-factoriza
tion frameworks\, using\n the transverse momenta of the incoming partons
\, by apply the KMR and method to calculate the unintegrated parton fra
gmentation functions (UFFs) from the ordinary integrated one\, i.e.\, the
parton fragmentation functions (FFs). The LO sets of DSS library for t
he input FFs is used. The numerical results are compared with the experim
ental data in the different energies which are reported by the different
collaborations\, such as TASSO\, AMY\, MARK II\, CELLO and Belle with t
he other QCD+fragmentation models. The behaviors of the normalized diff
erential cross sections and the multiplicity versus the "transverse moment
um" ($p_\\bot$) are discussed. The final results demonstrate that the KM
R and MRW UFFs give a good description of data and there is not much signi
ficant difference between the above three schemes. On the other hand\, ou
r results become closer to the data for the lower values of $p_\\bot$
and the higher values of center of mass energies.\nhttps://indico.desy.de
/event/28334/contributions/111977/
URL:https://indico.desy.de/event/28334/contributions/111977/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Sum rules for triple parton distribution functions
DTSTART;VALUE=DATE-TIME:20211115T153000Z
DTEND;VALUE=DATE-TIME:20211115T155000Z
DTSTAMP;VALUE=DATE-TIME:20220119T053700Z
UID:indico-contribution-111664@indico.desy.de
DESCRIPTION:Speakers: Jonathan Gaunt (University of Manchester)\, Oleh Fed
kevych (University of Genoa and INFN - National Institute for Nuclear Phys
ics (sezione di Genova))\nRecent measurements of the triple J/psi producti
on performed by the CMS collaboration suggest non-negligible contribution
from a triple parton scattering (TPS). The CMS results can be seen as a fi
rst experimental observation of a TPS process. Unfortunately\, due to the
absence of experimental fits\, triple parton distribution functions (tPDFs
)\, needed for the theoretical computation of TPS cross sections\, remain
unknown. Therefore\, in phenomenological studies of the TPS phenomenon one
still has to rely on certain model-dependent assumptions about the shape
of tPDFs and their relation to standard single parton distribution functio
ns.\n\nIn this talk I will discuss how one can extend the sum rules\, prev
iously proposed by Gaunt and Stirling for the double parton distribution f
unctions\, to the case of tPDFs and how one can use PYTHIA8 code to constr
uct tPDFs which will approximately obey such sum rules. Additionally\, I
will demonstrate how one can proof the sum rules for ''bare'' tPDFs using
the light-cone formalism.\nhttps://indico.desy.de/event/28334/contribution
s/111664/
URL:https://indico.desy.de/event/28334/contributions/111664/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Sudakov resummation from the BFKL evolution
DTSTART;VALUE=DATE-TIME:20211117T130000Z
DTEND;VALUE=DATE-TIME:20211117T132000Z
DTSTAMP;VALUE=DATE-TIME:20220119T053700Z
UID:indico-contribution-111667@indico.desy.de
DESCRIPTION:Speakers: Maxim Nefedov (Samara State University)\nBased on: P
hys. Rev. D 104\, 054039 (2021) [https://arxiv.org/abs/2105.13915]\n\nThe
Leding-Logarithmic (LL) gluon Sudakov formfactor is derived from rapidity-
ordered BFKL evolution with longitudinal-momentum conservation. This deriv
ation further clarifies the relation between High-Energy and TMD-factoriza
tions and can be extended beyond LL-approximation as well.\nhttps://indico
.desy.de/event/28334/contributions/111667/
URL:https://indico.desy.de/event/28334/contributions/111667/
END:VEVENT
BEGIN:VEVENT
SUMMARY:In-medium jet evolution via coherent medium induced radiation and
scatterings
DTSTART;VALUE=DATE-TIME:20211118T134000Z
DTEND;VALUE=DATE-TIME:20211118T140000Z
DTSTAMP;VALUE=DATE-TIME:20220119T053700Z
UID:indico-contribution-111666@indico.desy.de
DESCRIPTION:Speakers: Krzysztof Kutak (Institute of Nuclear Physics Polish
Academy of Sciences)\, Konrad Tywoniuk (University of Bergen)\, Martin Ro
hrmoser (Institute of Nuclear Physics\, Polish Academy of Sciences)\, Wies
ław Płaczek (Uniwersytet Jagiellonski Kraków)\, Etienne Blanco (IFJ-PAN
)\nWe propose a system of evolution equations that describe in-medium time
-evolution of transverse-momentumdependent quark and gluon fragmentation f
unctions. \nFurthermore\, we solve this system of equations using Monte Ca
rlo methods. We use the obtained solutions to construct observables that a
llow us to see \ndifferent behaviour of quark and gluon initiated final-st
ate radiation\, i.e. the average transverse momentum and energy contained
\nin a cone. In particular\, the later allows us to conclude that in the g
luon-initiated processes there is less energyin a cone\, so that the quark
jet \nis more collimated.\nhttps://indico.desy.de/event/28334/contributio
ns/111666/
URL:https://indico.desy.de/event/28334/contributions/111666/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Factorization for quark and gluon lattice TMDs
DTSTART;VALUE=DATE-TIME:20211116T145000Z
DTEND;VALUE=DATE-TIME:20211116T151000Z
DTSTAMP;VALUE=DATE-TIME:20220119T053700Z
UID:indico-contribution-111665@indico.desy.de
DESCRIPTION:Speakers: Yong Zhao (Argonne National Laboratory)\, Iain Stewa
rt (Massachusetts Institute of Technology)\, Stella Schindler (Massachuset
ts Institute of Technology)\, Markus Ebert (Max-Planck-Institut für Physi
k)\nRecent years have seen prominent progress in the first-principles calc
ulation of transverse-momentum-dependent parton distributions (TMDs) from
the so-called lattice TMDs\, which are equal time correlators that include
quasi-TMDs and those from the Lorentz-invariant approach. In this talk\,
I will show that the lattice TMDs and TMDs are related by a factorization
formula which can be rigorously derived in QCD. As a corollary\, there is
no mixing between quark and gluon sectors\, or quark of different flavors\
, in the matching for lattice TMDs\, which implies that their lattice calc
ulations can be much simpler than the collinear parton distributions. We a
lso verify these results at one-loop in perturbation theory.\nhttps://indi
co.desy.de/event/28334/contributions/111665/
URL:https://indico.desy.de/event/28334/contributions/111665/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Isolated photon production in the Parton Reggeization Approach wit
h real NLO corrections
DTSTART;VALUE=DATE-TIME:20211116T153000Z
DTEND;VALUE=DATE-TIME:20211116T155000Z
DTSTAMP;VALUE=DATE-TIME:20220119T053700Z
UID:indico-contribution-111975@indico.desy.de
DESCRIPTION:Speakers: Vladimir Saleev (Samara National Research University
)\, Alina Kuznetsova (Samara University)\nWe study isolated photon product
ion in the Parton Reggeization Approach with NLO corrections originated fr
om subprocesses of additional parton emissions. Two matching schemes are t
ested. The first one is based on Kt-ordering of emitted partons during Kt-
depended evolution\, the second one applies rapidity-ordering for factoriz
ation of real parton emissions. We compare our predictions for transverse
momentum spectra of isolated photons measured at the LHC.\nhttps://indico.
desy.de/event/28334/contributions/111975/
URL:https://indico.desy.de/event/28334/contributions/111975/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Role of parton fragmentation for associated J/psi production at h
igh energies
DTSTART;VALUE=DATE-TIME:20211119T132000Z
DTEND;VALUE=DATE-TIME:20211119T134000Z
DTSTAMP;VALUE=DATE-TIME:20220119T053700Z
UID:indico-contribution-111971@indico.desy.de
DESCRIPTION:Speakers: Artem Lipatov (Skobeltsyn Institute of Nuclear Physi
cs Lomonosov Moscow State University\, Moscow)\, Andrei Prokhorov (Lomonos
ov Moscow State University (RU)\, Joint Institute for Nuclear Research (R
U))\, Sergey Baranov (Lebedev Physical Institute)\nWe investigate the role
of parton fragmentation processes for associated gauge boson (Z or W) and
J/psi production at the LHC conditions. We focused on new partonic subpro
cesses\, namely\, the charmed or strange quark excitation followed by the
charmed quark fragmentation c -> J/psi + c. Additionaly we take into accou
nt the effects of multiple quark and gluon radiation in the initial and fi
nal states. We find that these contributions are important and reduce the
gap between the theoretical predictions and experimental results.\nhttps:/
/indico.desy.de/event/28334/contributions/111971/
URL:https://indico.desy.de/event/28334/contributions/111971/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Rapidity correlations in multiperipheral models and high energy QC
D
DTSTART;VALUE=DATE-TIME:20211115T142000Z
DTEND;VALUE=DATE-TIME:20211115T144000Z
DTSTAMP;VALUE=DATE-TIME:20220119T053700Z
UID:indico-contribution-112235@indico.desy.de
DESCRIPTION:Speakers: Grigorios Chachamis (IFT UAM-CSIC)\, Agustin Sabio V
era (IFT-CSIC & UAM)\nParticle-particle correlations\, especially rapidity
-rapidity correlations was already an important tool for hadron collider p
hysics since the early 70s. Recently\, we studied one-particle rapidity di
stributions and two-particle rapidity-rapidity correlations at hadron coll
iders revisiting one of the old models\, the Chew-Pigniotti multiperiphera
l model and we were surprised to realize that the predictions were very mu
ch in line with the predictions one gets for the minijet radiation by usin
g perturbative high energy QCD. Here\, we report on further results we obt
ain from studying rapidity-rapidity correlations by using the Monte Carlo
code BFKLex.\nhttps://indico.desy.de/event/28334/contributions/112235/
URL:https://indico.desy.de/event/28334/contributions/112235/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Hunting stabilization effects of the high-energy resummation via h
eavy flavor production at the LHC
DTSTART;VALUE=DATE-TIME:20211117T132000Z
DTEND;VALUE=DATE-TIME:20211117T134000Z
DTSTAMP;VALUE=DATE-TIME:20220119T053700Z
UID:indico-contribution-112375@indico.desy.de
DESCRIPTION:Speakers: Mohammed Maher Abdelrahim Mohammed (Università dell
a Calabria and INFN - Gruppo collegato di Cosenza)\, Francesco Giovanni Ce
liberto (ECT*/FBK Trento & INFN-TIFPA)\, Alessandro Papa (Università dell
a Calabria and INFN - Gruppo collegato di Cosenza)\, Dmitry Yu Ivanov (Sob
olev Institute of Mathematics)\, Michael Fucilla (Università della Calabr
ia and INFN - Gruppo collegato di Cosenza)\nWith the aim of targeting for
clear signals of the stabilization of the high-energy resummation under hi
gher-order corrections and energy-scale variation\, we investigate the inc
lusive semi-hard production of two bottom-flavored hadrons\, as well as a
single bottom-flavored hadron accompanied by a light jet. Working within t
he hybrid high-energy and collinear factorization formalism\, which encode
s the BFKL resummation of energy logarithms up to NLL accuracy\, we presen
t predictions for cross sections differential in rapidity and transverse m
omentum\, and for azimuthal-angle correlations. The fair stability the eme
rgers from the analysis of our distributions motivates our interest toward
future studies in wider kinematic ranges\, as the ones reachable at new-g
eneration colliding facilities (HL-LHC\, the FPF\, the EIC\, and NICA). He
re\, our hybrid factorization could serve as an additional tool to improve
the standard fixed-order description of heavy-flavored emissions and to p
ossibly gauge the feasibility of precision studies of these channels in th
e high-energy regime.\nhttps://indico.desy.de/event/28334/contributions/11
2375/
URL:https://indico.desy.de/event/28334/contributions/112375/
END:VEVENT
BEGIN:VEVENT
SUMMARY:HERAPDF2.0Jets and prospects for parton-branching PDFs with HERA j
ets data.
DTSTART;VALUE=DATE-TIME:20211117T151000Z
DTEND;VALUE=DATE-TIME:20211117T153000Z
DTSTAMP;VALUE=DATE-TIME:20220119T053700Z
UID:indico-contribution-112233@indico.desy.de
DESCRIPTION:Speakers: Katarzyna Wichmann (DESY)\, Sara Taheri Monfared (DE
SY)\nHERA inclusive and jet data has been used in collinear HERAPDF2.0Jets
fits at NLO and NNLO. The addition of the jet data allows a simultaneous
fit of parton distribution functions of the proton and determination of th
e strong coupling alpha_s(M2_Z). In the parton branching (PB) approach\, C
ollinear and TMD parton densities have been determined by fits to inclusiv
e deep inelastic scattering HERA data. This method allows one to simultane
ously take into account soft-gluon emission and the transverse momentum re
coils in the parton branchings along the QCD cascade. The latter leads to
a natural determination of the TMD PDFs in a proton. A crucial development
will be to include data from other measurements in a wider kinematic rang
e in order to constrain the TMD PDFs and gain sensitivity to intrinsic tra
nsverse momentum contributions. We present very preliminary results for PB
TMD fits using the same HERA inclusive and jet data at NLO. The results a
re compared to the HERAPDF2.0Jets predictions and a prospect of including
LHC data sets is discussed.\nhttps://indico.desy.de/event/28334/contributi
ons/112233/
URL:https://indico.desy.de/event/28334/contributions/112233/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Renormalization of the radiative jet function and its zero-bin sub
traction
DTSTART;VALUE=DATE-TIME:20211119T144000Z
DTEND;VALUE=DATE-TIME:20211119T150000Z
DTSTAMP;VALUE=DATE-TIME:20220119T053700Z
UID:indico-contribution-112378@indico.desy.de
DESCRIPTION:Speakers: Jungil Lee (Department of Physics\, Korea University
)\, June-Haak Ee (Fudan university)\, Xiang-Peng Wang (High Energy Physics
Division\, Argonne National Laboratory)\, Geoffrey T. Bodwin (High Energy
Physics Division\, Argonne National Laboratory)\nWe show how to compute d
irectly the renormalization/evolution of the\nradiative jet function that
appears in the factorization theorems for\n$B\\to \\gamma\\ell\\nu$ and $H
\\to \\gamma\\gamma$ through a $b$-quark\nloop. We point out that\, in ord
er to avoid double counting of soft\n contributions\, one should use in
the factorization theorems a\n subtracted radiative jet function\, fro
m which soft contributions\n have been removed. The soft-contribution s
ubtractions are zero-bin\nsubtractions in the terminology of soft-collinea
r effective theory. We\nshow that they can be factored from the radiative
jet function and that\nthe resulting soft-subtraction function gives rise
to a nonlocal\nrenormalization of the subtracted radiative jet function.
This is a\nnovel instance in which zero-bin subtractions lead to a nonloca
lity in\nthe renormalization of a subtracted quantity that is not present
in\nthe renormalization of the unsubtracted quantity. We demonstrate the\n
use of our formalism by computing the order-$\\alpha_s$ evolution kernel\n
for the subtracted radiative jet function.\nhttps://indico.desy.de/event/2
8334/contributions/112378/
URL:https://indico.desy.de/event/28334/contributions/112378/
END:VEVENT
BEGIN:VEVENT
SUMMARY:First solutions of the JIMWLK equation with the kinematical constr
aint
DTSTART;VALUE=DATE-TIME:20211116T155000Z
DTEND;VALUE=DATE-TIME:20211116T161000Z
DTSTAMP;VALUE=DATE-TIME:20220119T053700Z
UID:indico-contribution-112379@indico.desy.de
DESCRIPTION:Speakers: Piotr Korcyl (Jagiellonian University)\, Leszek Moty
ka (Jagiellonian University)\nIn this talk\, we describe the implementatio
n of the kinematical constraint within the Langevin formulation of the JIM
WLK equation following the proposal of Hatta and Iancu. We present stabili
ty and scaling tests and show first comparisons of the solutions without a
nd with the improvement. We also comment on the rapidity evolution rate of
the saturation radius.\nhttps://indico.desy.de/event/28334/contributions/
112379/
URL:https://indico.desy.de/event/28334/contributions/112379/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Power corrections in TMD factorization
DTSTART;VALUE=DATE-TIME:20211116T151000Z
DTEND;VALUE=DATE-TIME:20211116T153000Z
DTSTAMP;VALUE=DATE-TIME:20220119T053700Z
UID:indico-contribution-112380@indico.desy.de
DESCRIPTION:Speakers: Alexey Vladimirov (Regensburg University)\nI present
the recent studies of power corrections for the transverse momentum depen
dent (TMD) factorization. A particular emphasis is made on the novel metho
d of TMD operator expansion that yields the TMD factorization theorem on t
he operator level. This method grants a systematic description of power co
rrections to TMD factorization\, in particular\, it naturally introduces t
he concept of TMD-twist and allows a certain separation of kinematic and g
enuine power corrections. Also\, I present factorized expression at the ne
xt-to-leading power (NLP) (at NLO perturbative accuracy)\, and discuss the
evolution properties for TMD distribution of higher TMD-twists.\nhttps://
indico.desy.de/event/28334/contributions/112380/
URL:https://indico.desy.de/event/28334/contributions/112380/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The k_t- and (z\,k_t)-factorizations and their applications to the
e-p and p-p collisions
DTSTART;VALUE=DATE-TIME:20211118T132000Z
DTEND;VALUE=DATE-TIME:20211118T134000Z
DTSTAMP;VALUE=DATE-TIME:20220119T053700Z
UID:indico-contribution-110945@indico.desy.de
DESCRIPTION:Speakers: Majid Modarres (University of Tehran)\, Ramin Kord V
aleshabadi (University of Tehran)\, Rezaie Somayeh (University of Tehran)
\nIn the frameworks of $k_t$- and $(z\, k_t)$-factorizations we discuss v
arious TMDs (UPDFs) such as KMR\, MRW\, and PB which are based on the Suda
kov form factor and the different angular ordering. The comparison is also
made with the TMDlib and its possible extensions. The dependence of the a
bove TMDs on input PDFs i.e. MSHT20\, MMHT2014\, CT14\, etc are investigat
ed. Finally\, different processes such as e.g. $p-p$ Drell-Yan and $e-p$ i
nclusive jets productions in the above frameworks and KATIE parton-level e
vent generator are discussed and the comparison is also made with the avai
lable experimental data.\nhttps://indico.desy.de/event/28334/contributions
/110945/
URL:https://indico.desy.de/event/28334/contributions/110945/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Twist decomposition of the proton structure from BK equation
DTSTART;VALUE=DATE-TIME:20211119T144000Z
DTEND;VALUE=DATE-TIME:20211119T150000Z
DTSTAMP;VALUE=DATE-TIME:20220119T053700Z
UID:indico-contribution-112650@indico.desy.de
DESCRIPTION:Speakers: Mariusz Sadzikowski (Jagiellonian University)\, Lesz
ek Motyka (Jagiellonian University)\nWe perform a twist decomposition of t
he Balitsky-Kovchegov (BK) amplitude for the proton structure functions in
the leading logarithmic limit. Assuming a single iteration of the triple
pomeron vertex and using the Mellin space technique we discuss the BK corr
ections for the leading and subleading twist contributions.\nhttps://indic
o.desy.de/event/28334/contributions/112650/
URL:https://indico.desy.de/event/28334/contributions/112650/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Gauge-invariant TMD factorization for Drell-Yan hadronic tensor at
small $x$
DTSTART;VALUE=DATE-TIME:20211117T134000Z
DTEND;VALUE=DATE-TIME:20211117T140000Z
DTSTAMP;VALUE=DATE-TIME:20220119T053700Z
UID:indico-contribution-110941@indico.desy.de
DESCRIPTION:Speakers: Ian Balitsky (JLab/ODU)\nThe Drell-Yan process is s
tudied in the framework of TMD factorization in the Sudakov region $s\\gg
Q^2\\gg q_\\perp^2$ corresponding to recent LHC experiments with $Q^2$ of
order of mass of Z-boson and transverse momentum of DY pair $\\sim$ few t
ens GeV. The Drell-Yan hadronic tensors are calculated with ${1\\over Q^2
}$ accuracy\, first at the tree level and then with the double-log accurac
y. It is demonstrated that in the leading order in $N_c$ the higher-twist
quark-quark-gluon TMDs reduce to leading-twist TMDs due to QCD equation of
motion. The resulting tensor for unpolarized hadrons is EM gauge-invarian
t and depends on two leading-twist TMDs: $f_1$ responsible for total DY cr
oss section\, and Boer-Mulders function $h_1^\\perp$. The corresponding qu
alitative and semi-quantitative predictions for angular coefficients of Z-
boson production seem to agree with LHC data at corresponding kinematic
s.\nhttps://indico.desy.de/event/28334/contributions/110941/
URL:https://indico.desy.de/event/28334/contributions/110941/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Investigation of the proton structure with associated Z + heavy je
t production at the LHC
DTSTART;VALUE=DATE-TIME:20211116T174000Z
DTEND;VALUE=DATE-TIME:20211116T180000Z
DTSTAMP;VALUE=DATE-TIME:20220119T053700Z
UID:indico-contribution-111972@indico.desy.de
DESCRIPTION:Speakers: Gennady Lykasov (JINR)\, Maxim Malyshev (CMS (CMS Fa
chgruppe QCD))\, Hannes Jung (CMS (CMS Fachgruppe QCD))\, Artem Lipatov (S
kobeltsyn Institute of Nuclear Physics Lomonosov Moscow State University\,
Moscow)\, Semen Turchikhin (JINR)\nWe consider the production of $Z$ boso
ns associated with a heavy (charm and beauty) jet at the LHC energies usin
g two scenarios based on the transverse momentum dependent (TMD) parton de
nsities in the proton. First of them employs the Catani-Ciafaloni-Fiorani-
Marchesini gluon evolution and is implemented into the Monte-Carlo event g
enerator PEGASUS. The second scheme is based on the Parton Branching appro
ach implemented into the Monte-Carlo event generator CASCADE. We compare t
he predictions obtained within these two TMD-based approaches with each ot
her\, investigate their sensitivity to the TMD gluon densities in the prot
on and estimate the effects coming from parton showers\, double parton sca
ttering mechanism and possible intrinsic charm. Additionally\, we compare
our predictions with the results of traditional (collinear) pQCD calculati
ons performed with the NLO accuracy. It is shown that the TMD-based result
s do not contradict LHC experimental data.\nhttps://indico.desy.de/event/2
8334/contributions/111972/
URL:https://indico.desy.de/event/28334/contributions/111972/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Forward dijet production at the EIC: beyond the TMD factorization
DTSTART;VALUE=DATE-TIME:20211117T161000Z
DTEND;VALUE=DATE-TIME:20211117T163000Z
DTSTAMP;VALUE=DATE-TIME:20220119T053700Z
UID:indico-contribution-111662@indico.desy.de
DESCRIPTION:Speakers: Heikki Mäntysaari (University of Jyväskylä)\, Ren
aud Boussarie (Ecole Polytechnique\, CPHT)\, Raju Venugopalan (BNL)\, Fari
d Salazar (UCLA)\, Paul Caucal (BNL)\, Björn Schenke (BNL)\nMeasurements
of azimuthal correlations in the production of forward dijets in deep inel
astic scattering provide the opportunity to probe the Weizsäcker-Williams
gluon transverse momentum dependent (TMD) parton distribution\, and the p
ossibility for the discovery of gluon saturation at the future Electron-Io
n Collider (EIC). While the TMD factorization is expected to hold near bac
k-to-back production\, there are important kinematic (perturbative power)
and genuine saturation contributions that must be resummed for more contro
lled phenomenological predictions.\nIn this talk\, I will compare the resu
lts of the TMD and the improved TMD factorization framework to those in th
e Color Glass Condensate (CGC)\, and report on the expected size of kinema
tic and genuine saturation corrections at different kinematics accessible
at the EIC [1]. I will discuss recent progress towards the computation of
dijet production at the next-to-leading order in the CGC [2]\, and the pos
sibility of extending the TMD-CGC correspondence to higher orders in pertu
rbation theory.\n\nReferences:\n\n[1] The importance of kinematic twists a
nd genuine saturation effects in dijet production at the Electron-Ion Coll
ider. JHEP 09 (2021) 178. [arXiv: 2106.11301 hep-ph]\nR. Boussarie\, F. Sa
lazar\, H. Mäntysaari\, and B. Schenke.\n[2] Dijet impact factor in DIS a
t next-to-leading order in the Color Glass Condensate. Submitted to JHEP.
[arXiv: 2108.06347 hep-ph]\nP. Caucal\, F. Salazar\, and R. Venugopalan.\n
https://indico.desy.de/event/28334/contributions/111662/
URL:https://indico.desy.de/event/28334/contributions/111662/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Probing gluon number density with electron-dijet correlations at E
IC
DTSTART;VALUE=DATE-TIME:20211117T155000Z
DTEND;VALUE=DATE-TIME:20211117T161000Z
DTSTAMP;VALUE=DATE-TIME:20220119T053700Z
UID:indico-contribution-111973@indico.desy.de
DESCRIPTION:Speakers: Krzysztof Kutak (Institute of Nuclear Physics Polish
Academy of Sciences)\nWe propose a novel way of studying the gluon number
density (the so-called Weizsäcker-Williams gluon distribution) using the
planned Electron Ion Collider. Namely\, with the help of the azimuthal co
rrelations between the total transverse momentum of the dijet system and t
he scattered electron\, we examine an interplay between the effect of the
soft gluon emissions (the Sudakov form factor) and the gluon saturation ef
fects. The kinematic cuts are chosen such that the dijet system is produce
d in the forward direction in the laboratory frame\, which provides an upp
er bound on the probed longitudinal fractions of the hadron momentum carri
ed by scattered gluons. Further cuts enable us to use the factorization fo
rmalism that directly involves the unpolarized Weizsäcker-Williams gluon
distribution. We find this observable to be very sensitive to the soft glu
on emission and moderately sensitive to the gluon saturation.\nhttps://ind
ico.desy.de/event/28334/contributions/111973/
URL:https://indico.desy.de/event/28334/contributions/111973/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Heavy-flavor production and the kt-factorization approach in a var
iable-flavor-number scheme
DTSTART;VALUE=DATE-TIME:20211118T144000Z
DTEND;VALUE=DATE-TIME:20211118T150000Z
DTSTAMP;VALUE=DATE-TIME:20220119T053700Z
UID:indico-contribution-110947@indico.desy.de
DESCRIPTION:Speakers: Benjamin Guiot (Universidad Tecnica Federico Santa M
aria)\nWe present our last work (2108.06419) on D and B-meson production i
n the kt-factorization approach. One of our goals is to emphasize the impo
rtance of using the same scheme for UPDFs and matrix elements. Our calcula
tions\, based on 2->2 processes computed in a general-mass variable-flavor
-number scheme\, are compared to ALICE and LHCb data. Finally\, we discuss
how the 2->1 process could be consistently included in our calculations a
nd the expected consequences of this implementation.\nhttps://indico.desy.
de/event/28334/contributions/110947/
URL:https://indico.desy.de/event/28334/contributions/110947/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Evidence for the maximally entangled low x proton in Deep Inelasti
c Scattering from H1 data
DTSTART;VALUE=DATE-TIME:20211116T151000Z
DTEND;VALUE=DATE-TIME:20211116T153000Z
DTSTAMP;VALUE=DATE-TIME:20220119T053700Z
UID:indico-contribution-111668@indico.desy.de
DESCRIPTION:Speakers: Krzysztof Kutak (IFJ PAN)\, Martin Hentschinski (Uni
versidad de las Americas Puebla)\nMotivated by the Kharzeev-Levin entropy
formula which postulates a maximally entangled proton wave function in Dee
p Inelastic Scattering at low x\, we investigate the proposed relation bet
ween parton number and final state hadron multiplicity. Contrary to the or
iginal formulation we propose to determine partonic entropy from the sum o
f gluon and quark distribution functions at low x\, which we obtain from a
n unintegrated gluon distribution subject to next-to-leading Balitsky-Fadi
n-Kuraev-Lipatov evolution. We find that our framework provides a very goo
d description of recently measured H1 data on the final state hadron multi
plicity\, which provides experimental evidence for the proposed entropy fo
rmula. We furthermore provide a comparison based on CTEQ next-to-leading o
rder parton distribution functions\, which slightly overshoots the data\,
but provide in general an acceptable description.\nhttps://indico.desy.de/
event/28334/contributions/111668/
URL:https://indico.desy.de/event/28334/contributions/111668/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The role of pT resummation in fiducial cross sections at the LHC
DTSTART;VALUE=DATE-TIME:20211118T170000Z
DTEND;VALUE=DATE-TIME:20211118T172000Z
DTSTAMP;VALUE=DATE-TIME:20220119T053700Z
UID:indico-contribution-110944@indico.desy.de
DESCRIPTION:Speakers: Markus Ebert (Max-Planck-Institut für Physik)\, Fra
nk Tackmann (T (Phenomenology))\, Georgios Billis (T (Phenomenology))\, Ba
hman Dehnadi (DESY fellow)\, Johannes Michel (MIT)\nI discuss the importan
ce of pT resummation in fiducial cross sections at the LHC\, using gluon-f
usion Higgs production in the diphoton decay channel with fiducial cuts as
an example. In particular\, I discuss the treatment of fiducial power cor
rections that make the total cross section sensitive to small-pT resummati
on effects\, and thereby enhance the N3LO correction. Integrating the resu
mmed pT spectrum at N3LO+N3LL' accuracy thus allows us to predict for the
first time the total fiducial cross section N3LO and improved by resummati
on.\nhttps://indico.desy.de/event/28334/contributions/110944/
URL:https://indico.desy.de/event/28334/contributions/110944/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Measurement of the Drell-Yan transverse momentum dependence over a
wide mass range with CMS
DTSTART;VALUE=DATE-TIME:20211115T170000Z
DTEND;VALUE=DATE-TIME:20211115T172000Z
DTSTAMP;VALUE=DATE-TIME:20220119T053700Z
UID:indico-contribution-111970@indico.desy.de
DESCRIPTION:Speakers: Kyeongpil Lee (ULB)\nThe double differential cross s
ections of the Drell-Yan lepton pair\n(electron or muon) production\, as a
function of its invariant mass m_ll\, \ntransverse momentum pT\, and $\\p
hi*$ are measured. Drell-Yan masses between \n50 GeV and 1 TeV are investi
gated. Additionally\, a measurement is \nperformed requiring at least one
jet in the final state. The collected \ndata correspond to an integrated l
uminosity of 36.3 fb-1 of proton-proton \ncollisions recorded with the CMS
detector at the LHC at the center-of-mass \nenergy of 13 TeV in 2016. Mea
surements are compared to state-of-the-art \npredictions based on perturba
tive quantum chromodynamics including soft \ngluon resummation. Theses res
ults correspond to the CMS preliminary \nresults SMP-20-003.\nhttps://indi
co.desy.de/event/28334/contributions/111970/
URL:https://indico.desy.de/event/28334/contributions/111970/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Curing high-energy instability of the NLO heavy-quarkonium hadropr
oduction cross section with High-Energy Factorization
DTSTART;VALUE=DATE-TIME:20211116T145000Z
DTEND;VALUE=DATE-TIME:20211116T151000Z
DTSTAMP;VALUE=DATE-TIME:20220119T053700Z
UID:indico-contribution-111663@indico.desy.de
DESCRIPTION:Speakers: Melih Ozcelik (Institute for Theoretical Particle Ph
ysics\, KIT\, 76128 Karlsruhe\, Germany)\, Maxim Nefedov (Samara State Uni
versity)\, Jean-Philippe Lansberg (IPN Orsay - Paris Sud U. - CNRS/IN2P3)\
nThe energy dependence of the total hadroproduction cross section for pseu
doscalar quarkonia is computed via matching of the NLO Collinear-Factorisa
tion (CF) results with Leading-Logarithmic resummation of higher-order cor
rections $\\propto\\alpha_s^{n}\\ln^{n-1}(1/z)$ to the CF hard-scattering
coefficient\, where $z=M^2/\\hat{s}$ with $\\hat{s}$ being partonic center
-of-mass energy squared. The resummation is performed using High-Energy F
actorization(HEF). The resummation cures the collinear over-subtraction pr
oblem of the Next-to-Leading Order(NLO) CF calculation\, stabilizing the h
igh-energy behaviour of the cross section. Predictions of the NNLO $\\alph
a_s^2\\ln(1/z)$ term of the CF hard-scattering coefficient are made. The m
atching is performed directly in $z$-space for the first time using the I
nverse-Error Weighting (InEW) matching.\nhttps://indico.desy.de/event/2833
4/contributions/111663/
URL:https://indico.desy.de/event/28334/contributions/111663/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Disentangling Long and Short Distances in Momentum-Space TMDs
DTSTART;VALUE=DATE-TIME:20211116T130000Z
DTEND;VALUE=DATE-TIME:20211116T132000Z
DTSTAMP;VALUE=DATE-TIME:20220119T053700Z
UID:indico-contribution-112377@indico.desy.de
DESCRIPTION:Speakers: Markus Ebert (Max-Planck-Institut für Physik)\, Joh
annes Michel (not set)\, Iain Stewart (Massachusetts Institute of Technolo
gy)\, Zhiquan Sun (Massachusetts Institute of Technology)\nThe extraction
of nonperturbative TMD physics is made challenging by prescriptions that s
hield the Landau pole\, which entangle long- and short-distance contributi
ons in momentum space. The use of different prescriptions then makes the
comparison of fit results for underlying nonperturbative contributions mea
ningless on their own. We propose a model-independent method to restrict m
omentum-space observables to the perturbative domain. This method is based
on a set of integral functionals that act linearly on terms in the conven
tional position-space operator product expansion (OPE). Artifacts from the
truncation of the integral can be systematically pushed to higher powers
in $\\Lambda_{\\rm QCD}/k_T$. We demonstrate that this method can be used
to compute the cumulative integral of TMDPDFs over $k_T$ in terms of colli
near PDFs\, accounting for both radiative corrections and evolution effect
s. This gives a systematic way of correcting the naive picture where the T
MDPDF integrates to a collinear PDF\, and we find that for the unpolarized
distribution the corrections are a percent-level effect. We also show tha
t\, when supplemented with experimental data and improved perturbative inp
uts\, these functionals will enable model-independent limits to be put on
the nonperturbative OPE contributions in the Collins-Soper kernel and int
rinsic TMD distributions.\nhttps://indico.desy.de/event/28334/contribution
s/112377/
URL:https://indico.desy.de/event/28334/contributions/112377/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Zero-jettiness resummation for top-quark pair production at the LH
C
DTSTART;VALUE=DATE-TIME:20211119T134000Z
DTEND;VALUE=DATE-TIME:20211119T140000Z
DTSTAMP;VALUE=DATE-TIME:20220119T053700Z
UID:indico-contribution-112651@indico.desy.de
DESCRIPTION:Speakers: Matthew Lim (DESY)\nThe N-jettiness is a useful reso
lution variable to distinguish between events\nwith a different number of
jets in the final state. It has\nbeen successfully employed in slicing cal
culations for colour singlet processes at\nNNLO and its resummation forms
the basis for the Geneva approach to matching\nNNLO calculations to parton
showers. I will discuss the extension of the zero-jettiness\nresummation
for colour-singlet production to include the production of heavy\ncoloured
particles at the LHC. Having derived a factorisation theorem for the obse
rvable\nin this process\, we have resummed large logarithms up to approxim
ate NNLL' accuracy.\nI will describe the resummation framework we have dev
eloped and outline\nfuture applications to slicing calculations and NNLO+P
S event generation.\nhttps://indico.desy.de/event/28334/contributions/1126
51/
URL:https://indico.desy.de/event/28334/contributions/112651/
END:VEVENT
BEGIN:VEVENT
SUMMARY:T-odd effects in QCD and beyond
DTSTART;VALUE=DATE-TIME:20211119T150000Z
DTEND;VALUE=DATE-TIME:20211119T152000Z
DTSTAMP;VALUE=DATE-TIME:20220119T053700Z
UID:indico-contribution-112652@indico.desy.de
DESCRIPTION:Speakers: Andrea Signori (University of Pavia and INFN)\, Dyla
n Manna (University of Michigan)\, Christine Aidala (University of Michiga
n)\nIn this talk we will describe a parallel between phenomenological and
symmetry-based descriptions of the process dependence of the Time-reversal
-odd phenomena in QCD\, such as the Sivers effect\, with the goal of defin
ing the essential elements that lead to such process dependence in QCD. Wi
th the necessary elements clarified across these two complementary descrip
tions\, this will then serve as a starting point to explore possible gener
alizations in a different gauge theory.\nhttps://indico.desy.de/event/2833
4/contributions/112652/
URL:https://indico.desy.de/event/28334/contributions/112652/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Diphoton production at small transverse momentum: resummation and
challenges
DTSTART;VALUE=DATE-TIME:20211118T172000Z
DTEND;VALUE=DATE-TIME:20211118T174000Z
DTSTAMP;VALUE=DATE-TIME:20220119T053700Z
UID:indico-contribution-112237@indico.desy.de
DESCRIPTION:Speakers: Tobias Neumann (Brookhaven National Laboratory)\nAt
the LHC\, diphoton production constitutes the main background of Higgs pro
duction in the diphoton decay and of many new physics models predicting la
rge-mass diphoton resonances. Underestimated theoretical uncertainties and
large perturbative corrections have been a long-standing issue over the y
ears with various suggestions. Especially the transverse momentum spectrum
has lead to various prescriptions. We present transverse momentum resumme
d diphoton predictions at the level of N$^3$LL$'$+NNLO which include the r
ecently published 3-loop hard and beam functions. We discuss the residual
uncertainties and challenges for the transverse momentum distribution and
address the effect of hybrid-cone photon isolation.\nhttps://indico.desy.d
e/event/28334/contributions/112237/
URL:https://indico.desy.de/event/28334/contributions/112237/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Finite-𝑁𝑐 corrections to Wilson line correlators
DTSTART;VALUE=DATE-TIME:20211116T161000Z
DTEND;VALUE=DATE-TIME:20211116T163000Z
DTSTAMP;VALUE=DATE-TIME:20220119T053700Z
UID:indico-contribution-112310@indico.desy.de
DESCRIPTION:Speakers: Johannes Hamre Isaksen (University of Bergen)\, Konr
ad Tywoniuk (University of Bergen)\nIn high-energy heavy-ion collisions\,
a quark-gluon plasma is produced. One way to study this exotic type of mat
ter is to analyze the effect it has on high-energy partons traversing it.
This leads to a rich phenomenology that commonly is referred to as jet que
nching. High-energy partons propagating in the hot and dense medium mainly
experience transverse momentum broadening which leads to additional radia
tive energy loss. The theoretical description of the main mechanisms behin
d these phenomena has been well known for some time.\nOne effect the mediu
m has on partons propagating through it\, is that their color continuously
rotates\, an effect that is encapsulated in a Wilson line along their tra
jectory. When calculating observables\, one typically has to deal with tra
ces of two or more medium-averaged Wilson lines. These are usually dealt w
ith in the literature by invoking the large-$𝑁_𝑐$ limit\, but exact
calculations have been lacking in many cases. In our work [1]\, we show ho
w correlators of multiple Wilson lines appear\, and develop a method to ca
lculate them to all orders in $𝑁_𝑐$. Specifically\, we will focus on
the trace of four Wilson lines\, which we develop a differential equation
for. We will then generalize this calculation to a product of an arbitrar
y number of Wilson lines\, and show how to do the exact calculation numeri
cally\, and even analytically in the large-$𝑁_𝑐$ limit.\nEven though
these results are derived in the context of high-$𝑝_𝑇$ jet processe
s\, they are quite general and can be used in other situations where Wilso
n line correlators appear.\n\n[1] J. H. Isaksen and K. Tywoniuk\, “Wilso
n line correlators beyond the large-Nc\,” 7 2021 https://arxiv.org/abs/2
107.02542\nhttps://indico.desy.de/event/28334/contributions/112310/
URL:https://indico.desy.de/event/28334/contributions/112310/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Transverse Momentum Dependent Gluon Distribution within High Energ
y Factorization at Next-to-Leading Order
DTSTART;VALUE=DATE-TIME:20211117T142000Z
DTEND;VALUE=DATE-TIME:20211117T144000Z
DTSTAMP;VALUE=DATE-TIME:20220119T053700Z
UID:indico-contribution-110942@indico.desy.de
DESCRIPTION:Speakers: Martin Hentschinski (Universidad de las Americas Pue
bla)\nWe discuss Transverse Momentum Dependent (TMD) gluon distributions w
ithin high energy factorization at next-to-leading order in the strong cou
pling within the framework of Lipatov's high energy effective action. Unli
ke previous results obtained within high energy factorization\, our framew
ork allows to recover the complete anomalous dimension associated with Col
lins-Soper-Sterman (CSS) evolution of the TMD distribution\, including als
o single-logarithmic terms in the CSS evolution. Another interesting featu
re concerns the relation between unpolarized and linearly polarized gluon
TMD in the BFKL limit. While our calculation confirms that both distributi
ons agree in the BFKL limit at leading order\, we find that they differ\,
once next-to-leading order corrections are being included. We furthermore
establish a link between the QCD operator definition of the TMD gluon dist
ribution and a previously derived off-shell TMD gluon-to-gluon splitting f
unction\, which is within the present framework obtained as the real 1-loo
p correction.\nhttps://indico.desy.de/event/28334/contributions/110942/
URL:https://indico.desy.de/event/28334/contributions/110942/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Universality of quantum corrections to transverse momentum broaden
ing
DTSTART;VALUE=DATE-TIME:20211119T150000Z
DTEND;VALUE=DATE-TIME:20211119T152000Z
DTSTAMP;VALUE=DATE-TIME:20220119T053700Z
UID:indico-contribution-112653@indico.desy.de
DESCRIPTION:Speakers: Yacine Mehtar-Tani (BNL)\, Paul Caucal (BNL)\nWe sho
w that the resummation of double logarithmic corrections to transverse mom
entum broadening of fast partons in large QCD media in the vicinity of the
saturation boundary yields a universal distribution and exhibits anomalou
s scaling akin to super diffusive processes such as Lévy random walks. T
his asymptotic\, all order result may have implications in the phenomenolo
gy of dijet production in pA and AA collisions and provides a new initial
condition for small-x evolution that accounts for gluon fluctuations that
live within the target.\nhttps://indico.desy.de/event/28334/contributions/
112653/
URL:https://indico.desy.de/event/28334/contributions/112653/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Transverse-momentum resummation for boson plus jet production at h
adron colliders
DTSTART;VALUE=DATE-TIME:20211116T172000Z
DTEND;VALUE=DATE-TIME:20211116T174000Z
DTSTAMP;VALUE=DATE-TIME:20220119T053700Z
UID:indico-contribution-112311@indico.desy.de
DESCRIPTION:Speakers: Jürg Haag (UZH)\nIn this talk I discuss the associa
ted production of a vector or Higgs boson with a jet in hadronic collision
s. When the transverse momentum of the boson-jet system is much smaller th
an its invariant mass\, the QCD perturbative expansion is affected by larg
e logarithmic terms that must be resummed to all orders. I discuss the all
-order resummation structure of the logarithmically enhanced contributions
up to next-to-leading logarithmic accuracy. The presented resummation for
malism is fully differential in the kinematic variables of the boson-jet
system. Soft-parton radiation produces azimuthal correlations that are ful
ly accounted for in this framework. I present explicit analytical results
up to next-to-leading order and next-to-leading logarithmic accuracy\, tha
t include the exact dependence on the jet radius. I also elaborate on the
presence of non-global logarithms for this observable as well as the absen
ce of clustering logarithms when one uses anti-kt jet-clustering.\nhttps:/
/indico.desy.de/event/28334/contributions/112311/
URL:https://indico.desy.de/event/28334/contributions/112311/
END:VEVENT
BEGIN:VEVENT
SUMMARY:A Philosophical Perspective on Problems in Physics
DTSTART;VALUE=DATE-TIME:20211117T183000Z
DTEND;VALUE=DATE-TIME:20211117T193000Z
DTSTAMP;VALUE=DATE-TIME:20220119T053700Z
UID:indico-contribution-112074@indico.desy.de
DESCRIPTION:Speakers: Radin Dardashti (U. Wuppertal)\nThe everyday practic
e of physicists is to a large extent determined by the scientific problems
they are confronted with. The conceptual analysis of scientific problems
and how they change\, therefore\, may allow for a fine-grained investigati
on of the development of a scientific discipline. In this talk I discuss w
hat constitutes a scientific problem\, what its elements are and how they
change. I will illustrate the advantages of a more problem-focused approac
h in understanding the development of modern particle physics and provide
a perspective that may shed some light in the assessment of open problems
and whether they constitute “genuine” problems.\nhttps://indico.desy.d
e/event/28334/contributions/112074/
URL:https://indico.desy.de/event/28334/contributions/112074/
END:VEVENT
BEGIN:VEVENT
SUMMARY:QCD/QED interference in fixed color parton showers
DTSTART;VALUE=DATE-TIME:20211115T132000Z
DTEND;VALUE=DATE-TIME:20211115T134000Z
DTSTAMP;VALUE=DATE-TIME:20220119T053700Z
UID:indico-contribution-112592@indico.desy.de
DESCRIPTION:Speakers: Leif Gellersen (Lund UNiversity)\nWe assess the effe
ct of QCD/QED interference effects in fixed color parton showers with tree
level matrix element corrections.\nhttps://indico.desy.de/event/28334/con
tributions/112592/
URL:https://indico.desy.de/event/28334/contributions/112592/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Factorization for the Transverse Momentum Distributions in SIDIS a
t Subleading Power
DTSTART;VALUE=DATE-TIME:20211116T132000Z
DTEND;VALUE=DATE-TIME:20211116T134000Z
DTSTAMP;VALUE=DATE-TIME:20220119T053700Z
UID:indico-contribution-112376@indico.desy.de
DESCRIPTION:Speakers: Markus Ebert (Max-Planck-Institut für Physik)\, Iai
n Stewart (Massachusetts Institute of Technology)\, Anjie Gao (Massachuset
ts Institute of Technology)\nFully differential measurements of the Semi-I
nclusive DIS process with polarized beams provide important information on
the three-dimensional structure of hadrons. In particular\, azimuthal asy
mmetries of the fragmenting hadron probe interesting new correlations betw
een partons in the hadronic system through novel hadronic distribution fun
ctions. In the framework of factorization for transverse momentum distribu
tions (TMDs) some key asymmetries start at subleading order in the power e
xpansion\, where the formalism needed to fully relate observables and dist
ributions is not yet under control\, being primarily at tree level in the
parton model. In this talk I utilize the soft collinear effective theory f
ormalism to answer a few open questions\, including providing generalized
definitions of the distribution functions that are valid beyond tree level
\, giving a proof of completeness of the basis of functions\, and providin
g a description of soft dynamical effects. These results enable a QCD desc
ription of SIDIS azimuthal asymmetries beyond tree level\, and hence provi
de a framework for systematically improvable relations to the underlying d
istributions.\nhttps://indico.desy.de/event/28334/contributions/112376/
URL:https://indico.desy.de/event/28334/contributions/112376/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Next-to SV resummed Drell-Yan cross section beyond leading-logarit
hm
DTSTART;VALUE=DATE-TIME:20211119T140000Z
DTEND;VALUE=DATE-TIME:20211119T142000Z
DTSTAMP;VALUE=DATE-TIME:20220119T053700Z
UID:indico-contribution-111669@indico.desy.de
DESCRIPTION:Speakers: Ajjath A.H (IMSc\, Chennai)\, aparna sankar (IMSc\,
India)\, Pooja Mukherjee (University of Bonn\, Germany)\, Ravindran V.\, S
urabhi Tiwari\nWe present the resummed predictions for inclusive cross sec
tion for Drell-Yan (DY) production up to next-to-next-to leading logarith
mic ($\\rm \\overline{ NNLL}$) accuracy taking into account both soft virt
ual (SV) and next-to SV (NSV) threshold logarithms. We restrict ourselve
s to resummed contributions only from quark anti-quark ($q \\bar q$) initi
ated channels. The resummation is performed in Mellin-$N$ space. We der
ive the $N$-dependent coefficients and the $N$-independent constants to
desired accuracy for our study. The resummed results are matched through
the minimal prescription procedure with the fixed order results. We find
that the resummation\, taking into account the NSV terms\, appreciably in
creases the cross section while decreasing the sensitivity to renormalisat
ion scale. We observe that\, at 13 TeV LHC energies\, the SV+NSV resummati
on at $\\rm \\overline{ NLL} (\\rm \\overline{NNLL})$ gives about 8\\% (2
\\%) corrections respectively to the NLO (NNLO) results for the considered
$Q$ range: 150-3500 GeV. In addition\, the absence of quark gluon initia
ted contributions to NSV part in the resummed terms leaves large factorisa
tion scale dependence indicating their importance at NSV level. We also s
tudy the numerical impact of $N$-independent constants and explore the amb
iguity involved in exponentiating them.Finally we present our predictions
for the neutral Drell-Yan process at various center of mass of energies.\n
https://indico.desy.de/event/28334/contributions/111669/
URL:https://indico.desy.de/event/28334/contributions/111669/
END:VEVENT
END:VCALENDAR