Conveners
WG4 Heavy Flavours
- Mikhaylo Lisovyi (DESY/Hamburg Uni)
- Martijn Mulders (CERN)
- Maximilian Stahlhofen (DESY)
WG4 Heavy Flavours
- Martijn Mulders (CERN)
- Mikhaylo Lisovyi (DESY/Hamburg Uni)
- Maximilian Stahlhofen (DESY)
WG4 Heavy Flavours
- Maximilian Stahlhofen (DESY)
- Mikhaylo Lisovyi (DESY/Hamburg Uni)
- Martijn Mulders (CERN)
WG4 Heavy Flavours
- Mikhaylo Lisovyi (DESY/Hamburg Uni)
- Maximilian Stahlhofen (DESY)
- Martijn Mulders (CERN)
WG4 Heavy Flavours
- Maximilian Stahlhofen (DESY)
- Mikhaylo Lisovyi (DESY/Hamburg Uni)
- Martijn Mulders (CERN)
WG4 Heavy Flavours
- Martijn Mulders (CERN)
- Mikhaylo Lisovyi (DESY/Hamburg Uni)
- Maximilian Stahlhofen (DESY)
WG4 Heavy Flavours
- Mikhaylo Lisovyi (DESY/Hamburg Uni)
- Martijn Mulders (CERN)
- Maximilian Stahlhofen (DESY)
WG4 Heavy Flavours
- Martijn Mulders (CERN)
- Mikhaylo Lisovyi (DESY/Hamburg Uni)
- Maximilian Stahlhofen (DESY)
WG4 Heavy Flavours
- Martijn Mulders (CERN)
- Mikhaylo Lisovyi (DESY/Hamburg Uni)
- Maximilian Stahlhofen (DESY)
Mr
Anton Karpishkov
(Samara State Aerospace University)
12/04/2016, 09:00
Heavy Flavours (Charm, Beauty and Top)
We study the inclusive DDbar and DD pair production in proton-proton collisions at the LHC at leading order of the parton Reggeization approach endowed with universal scale-depended fragmentation functions for c-quark to D-meson and for gluon to D-meson transitions. We have described DDbar and DD correlations in azimuthal angle, as well as transverse momentum, rapidity, and invariant mass...
Prof.
Antoni Szczurek
(the Institute of Nuclear Physics PAS)
12/04/2016, 09:20
Heavy Flavours (Charm, Beauty and Top)
Some time ago two of us predicted that at large energies relevant for the LHC the production of double charm should be dominated by the double-parton scattering (DPS) mechanism [1]. Those studies of double $c \bar c$ production was extended next to the $k_t$-factorization approach which includes effectively higher-order QCD effects [2,3]. A relatively good description of the LHCb experimental...
Yu Zhang
(UCAS)
12/04/2016, 09:40
Heavy Flavours (Charm, Beauty and Top)
The BESIII Experiment at the Beijing Electron Positron Collider (BEPCII) has accumulated the world's largest e+e- collision samples atψ(3770) peak, around theψ(4040) nominal mass, and at the Lambda_c-pair mass threshold which allow us to study decays of charmed mesons and baryons in a uniquely clean background. In this talk, we will review our recent results including: (1) the extractions of...
Mr
Pietro Marino
(SNS and INFN-Pisa)
12/04/2016, 10:00
Heavy Flavours (Charm, Beauty and Top)
Most recent results on CP violation searches in the charm sector are presented. These include the world’s most precise measurements of direct and indirect CP asymmetries in the singly-Cabibbo-suppressed modes D0->pipi and D0->KK, based on the 3/fb data sample collected by LHCb during Run I.
Adrian John Bevan
(Queen Mary University of London)
12/04/2016, 11:00
Heavy Flavours (Charm, Beauty and Top)
Based on the full data set recorded with the BABAR detector at center-of-mass energies at and near the Upsilon(4S) resonance, and corresponding to an integrated luminosity of approximately 468 fb-1, we measure the D0-D0bar mixing parameters using a time-dependent amplitude analysis of the decay D0 -> pi+pi-pi0.
With the same BABAR data set, we also measure the mass difference, Delta m,...
Guennadi Borisov
(Lancaster)
12/04/2016, 11:20
Heavy Flavours (Charm, Beauty and Top)
Search for deviations from the standard model is performed in the systems of the neutral B mesons.
The Bs system is studied in the decay into J/psi phi. The mixing phase phi_s and the width difference DeltaGamma_s are determined through the simultaneous study of angular distributions in the final state and of the decay time, performed together with flavor tagging at production. ÊThe...
Dr
Deepanwita Dutta
(Tata Institute of Fundamental Research)
12/04/2016, 11:40
Heavy Flavours (Charm, Beauty and Top)
We present the results of radiative and annihilation penguin $B(B_{s})$ decays at Belle. The $b\rightarrow s (d)\gamma$ processes are sensitive to physics beyond the Standard Model as new heavy particles can enter the loop and change the branching fractions and/or the kinematic variables. We report the results of fully inclusive $B\rightarrow X_{s,d}\gamma$ decay with both leptonic tagging and...
Adrian John Bevan
(London QUML)
12/04/2016, 12:00
Heavy Flavours (Charm, Beauty and Top)
Processes involving the FCNC transitions in b-hadron decays are suppressed in the SM and are sensitive to new physics.
New results in the search for the rare decays of Bs and Bd into mu+mu- are presented. They are based on the full sample of data collected by ATLAS at 7 and 8 TeV of collision energy. The consistency with the SM and with other available measurements is discussed.
The...
Dr
Hang Yin
(Central China Normal Univerisity)
12/04/2016, 12:40
Heavy Flavours (Charm, Beauty and Top)
Precision measurements of the Bc mass, lifetime and relative production cross-section, and the observation of several new decay modes were achieved using the 3 fb-1 of data collected by the LHCb experiment during the first run of the LHC. These results provide useful input for QCD effective models.
Tomasz Szumiak
(Cracow-AGH)
12/04/2016, 14:30
Heavy Flavours (Charm, Beauty and Top)
By using the very first proton-proton collision data of the LHC Run II, LHCb performed a series of measurements, notably including the cross-sections for heavy boson, quarkonia, beauty and charm productions. The results have been carried out by exploiting a new scheme for the LHCb software trigger that gives the possibility to finalise physics analyses directly from data objects produced by...
Prof.
Kai-Feng Chen
(National Taiwan University)
12/04/2016, 14:50
Heavy Flavours (Charm, Beauty and Top)
The available statistics of heavy flavored particles collected at the LHC in pp collisions at 7, 8 and 13 TeV provides an excellent opportunity to test the standard model and probe for new physics effects. A review of selected recent measurements on heavy flavors (production and propeties, rare decays, CP violation, exotic and standard quarkonia) by CMS based on LHC Run I and Run II data is presented.
Artem Maevskiy
(M.V. Lomonosov Moscow State University)
12/04/2016, 15:10
Heavy Flavours (Charm, Beauty and Top)
This talk will report on four measurement recently completed by ATLAS:
(a) the decay of Lambda_b into Lambda and psi(2S), observed for the first time and compared to the decay into Lambda and J/psi;
(b) the decay of Bc into J/psi Ds and J/psi Ds*, including the first polarisation measurement for the latter channel;
(c) the measurement of the ratio of the fragmentation fraction f_s/f_d,...
Sven-Olaf Moch
(UHH)
12/04/2016, 15:30
Heavy Flavours (Charm, Beauty and Top)
We update predictions for lepton fluxes from the hadroproduction of charm quarks in the scattering of primary cosmic rays with the Earth's atmosphere. The calculation of charm-pair hadroproduction applies the latest results from perturbative QCD through next-to-next-to-leading order and modern parton distributions, together with estimates on various sources of uncertainties. Our predictions...
Dr
Oleksandr Zenaiev
(DESY)
12/04/2016, 16:30
Heavy Flavours (Charm, Beauty and Top)
A summary of measurements of the fragmentation of charm quarks into a specific hadron is given. Measurements performed in photoproduction and deep inelastic scattering in e+-p, pp and e+e- collisions are compared, using up-to-date branching ratios. Within uncertainties, all measurements agree, supporting the hypothesis that fragmentation is independent of the specific production process....
Abilio De Freitas
(DESY - Zeuthen)
12/04/2016, 16:50
Heavy Flavours (Charm, Beauty and Top)
We report on the current status of the ongoing calculation of 3-loop heavy flavor corrections to deep inelastic structure functions at large virtualities.
Dr
Valerio Bertone
(University of Oxford)
12/04/2016, 17:10
Heavy Flavours (Charm, Beauty and Top)
In this talk I will present a novel determination of the mass of the
charm quark extracted by analyzing the statistical quality of fits of
parton distribution functions (PDFs) to inclusive and exclusive charm
deep-inelastic scattering (DIS) cross-section data from Runs I and II
of the HERA collider. We employ the running mass definition in the
MSbar scheme, which improves the perturbative...
Prof.
Fred Olness
(SMU)
12/04/2016, 17:30
Heavy Flavours (Charm, Beauty and Top)
As the energy of the LHC increases, the heavy quarks play a more significant role. We examine both the impact of the heavy quarks on
the predictions for processes such as boson production (both with and without an associated heavy quark), and consider methods to constrain the heavy quark PDFs.
Andrew Papanastasiou
(Cavendish Laboratory, University of Cambridge)
12/04/2016, 17:50
Heavy Flavours (Charm, Beauty and Top)
After carefully explaining how fixed and variable flavour schemes arise in
the context of DIS, I will discuss how one can consistently combine the
merits of the two. The final matched result includes the full power
corrections of the fixed-flavour scheme and resums the potentially large
logs. I will then talk about the application of this approach to the case
of bbH at the LHC and present...
Christian Weiss
(Jefferson Lab)
12/04/2016, 18:10
Heavy Flavours (Charm, Beauty and Top)
We study the prospects for measuring nuclear modifications of the gluon density
(gluonic EMC effect, antishadowing, shadowing) using open heavy flavor production
(charm, beauty) at a future Electron-Ion Collider (EIC). Such direct measurements
complement indirect studies of nuclear gluons through DGLAP evolution and could
substantially advance our understanding of QCD in nuclei. Building...
Mr
Nazar Bartosik
(DESY)
13/04/2016, 09:00
Heavy Flavours (Charm, Beauty and Top)
Measurements of the inclusive and differential top quark pair production cross section at 7 TeV, 8 TeV and 13 TeV are presented, performed using CMS data collected in 2011, 2012 and 2015. The total cross section is measured in the lepton+jets, dilepton and fully hadronic channels, including the tau-dilepton and tau+jets modes. Indirect constraints on both the top quark mass and alpha_s are...
Mr
Hasib Ahmed
(University of Oklahoma)
13/04/2016, 09:20
Heavy Flavours (Charm, Beauty and Top)
Measurements of the inclusive and differential topquark pair cross sections in protonproton collisions at both 8 and 13 TeV
with the ATLAS detector at the Large Hadron Collider are presented. The inclusive measurements reach high precision and are
compared to the best available theoretical calculations. Differential measurements of the kinematic properties of the top quark
production...
Deniz Poyraz
(Ghent University in Ghent, Belgium)
13/04/2016, 09:40
Heavy Flavours (Charm, Beauty and Top)
Measurements of several top-quark properties are presented, obtained from the CMS data collected at various centre-of-mass energies. The results include measurements of the top pair charge asymmetry, the W helicity in top decays, the top quark charge, the ttbar spin correlation, of the top polarisation and the search for anomalous couplings. The results are compared with predictions from the...
Mohammad Kareem
(Georg-August-Universitaet Goettingen)
13/04/2016, 10:00
Heavy Flavours (Charm, Beauty and Top)
Precise measurements of the properties of the top quark test the Standard Model (SM) and can be used to constrain new physics models.
The top quark pair charge asymmetry is an asymmetry predicted to occur beyond leadingorder QCD in the SM, and may be significantly
enhanced by the presence of new physics. The ttbar production charge asymmetry is measured inclusively and differentially...
Prof.
Matthias Steinhauser
(KIT)
13/04/2016, 11:00
Heavy Flavours (Charm, Beauty and Top)
In this talk the relation between heavy quark masses defined in the
on-shell and $\overline{\rm MS}$ scheme is discussed at four-loop
order in QCD. Special emphasis is put on the top quark mass where the
four-loop result is used to estimate the remaining renormalon
uncertainty. The relation between the $\overline{\rm MS}$ and on-shell
mass can also be used to establish precise relations...
Michael Bender
(LMU München)
13/04/2016, 11:20
Heavy Flavours (Charm, Beauty and Top)
The latest measurements of the top quark mass using the ATLAS experiment are presented. A measurement based on a multidimensional
template fit that can constrain the uncertainties on the energy measurements of jets is presented and combined with a measurement
using dilepton events. A new measurement of the top quark mass using leptonic kinematic variables is presented. The measurement...
Mr
Simon Spannagel
(DESY - CMS)
13/04/2016, 11:40
Heavy Flavours (Charm, Beauty and Top)
Measurements of the top quark mass are presented, obtained from CMS data collected in proton proton collisions at the LHC at centre-of-mass energies of 7 TeV and 8 TeV. The mass of the top quark is measured using several methods and channels, including the reconstructed invariant mass distribution of the top quark, an analysis of endpoint spectra as well as measurements from shapes of top...
Dr
Giuseppe Bevilacqua
(University of Debrecen)
13/04/2016, 12:00
Heavy Flavours (Charm, Beauty and Top)
We present results for the NLO QCD corrections to the process $pp \to t\bar{t} j \to W^+W^-b\bar{b} j \to e^+ \nu_e \mu^- \bar{\nu}_\mu b \bar{b} j + X$, including for the first time the full off-shell effects for top quarks and W bosons: double-, single- and non-resonant contributions at the order {\cal{O}}(\alpha_{s}^4 \alpha^4). Focusing on the case of the LHC at 8 TeV, we analyse...
Dr
Stephan Thier
(Universität Hamburg)
13/04/2016, 12:20
Heavy Flavours (Charm, Beauty and Top)
We determine the mass of the top quark from cross section data for the hadro-production of single top quarks in the $t$- and $s$-channel reactions. We apply QCD perturbative corrections up to next-to-next-to-leading order terms from soft-gluon resummation to extract the top-quark mass in well-defined renormalization schemes. The cross section for the production of single top quarks is...
Prof.
Andre Hoang
(University of Vienna)
13/04/2016, 12:40
Heavy Flavours (Charm, Beauty and Top)
The lack of knowledge how the top quark mass parameter in Monte-Carlo event
generators (MCs) is related to field theoretically defined mass schemes limits the
theoretical interpretation of the top quark mass measurements based on templates
obtained from direct reconstruction analyses at hadron colliders. In the first part of the talk
I review the conceptual aspects of the problem and...
Mr
Patrick Rieck
(Humboldt-University of Berlin)
13/04/2016, 14:30
Heavy Flavours (Charm, Beauty and Top)
Measurements of single topquark production in proton proton collisions are presented. The measurements include the first
such measurements from the 13 TeV ATLAS dataset. In the leading order process, a W boson is exchanged in the tchannel.
The single topquark and antitop total production cross sections, their ratio, as well as a measurement of the inclusive
production cross section...
Soureek Mitra
(Tata Institute of Fundamental Research in Mumbai, India)
13/04/2016, 14:50
Heavy Flavours (Charm, Beauty and Top)
Measurements of single top quark production are presented, performed using CMS data collected in 2011, 2012 and 2015 at centre-of-mass energies of 7, 8 and 13 TeV respectively. The cross sections for the electroweak production of single top quarks in the t-channel and in association with W-bosons is measured and the results are used to place constraints on the CKM matrix element Vtb. In the...
Alexander Khanov
(Oklahoma State)
13/04/2016, 15:10
Heavy Flavours (Charm, Beauty and Top)
The large centreofmass energy available at the protonproton collider LHC allows for the copious production of top quark pairs
in association with other final state particles at high transverse momentum. The ATLAS experiment has measured several final state
observables that are sensitive to additional radiation in top antitop quark final states. Results on the top production in...
Bugra Bilin
(Middle East Technical University, Physics Department in Ankara, Turkey.)
13/04/2016, 15:30
Heavy Flavours (Charm, Beauty and Top)
State-of-the-art theoretical predictions accurate to next-to-leading order QCD interfaced with Pythia8 and Herwig++ event generators are tested by comparing the unfolded ttbar differential data collected with the CMS detector at 8 TeV. These predictions are also compared with the underlying event activity distributions in ttbar events using CMS proton-proton data collected in 2015 at a center...
Dr
Aiqiang Guo
(IHEP and DESY)
14/04/2016, 09:00
Heavy Flavours (Charm, Beauty and Top)
The BESIII Experiment collected large data samples for electron-positron collisions with center-of-mass above 4 GeV during 2013 and 2014. The analysis of these samples has resulted in a number of surprising discoveries, such as the discoveries of the electrically charged "Zc" structures, which, if resonant, cannot be accomodated in the traditional charm quark and anti-charm quark picture of...
Mr
Iain Bertram
(Lancaster University)
14/04/2016, 09:20
Heavy Flavours (Charm, Beauty and Top)
We have used the full D0 dataset consisting of 10.4 fb-1 of proton-antiproton collision data to search for new exotic QCD states. We report on the results in specific channels.
Konstantinos Kordas
(Aristotle Univ. of Thessaloniki)
14/04/2016, 09:40
Heavy Flavours (Charm, Beauty and Top)
We present the measurement of the differential cross-section of the X(3872) state through its decays to J/psi pi pi final state . The cross-section was extracted for both prompt and non-prompt production. The existence of the X(3872) suggests the presence of its bottomonium counterpart X_b. Search for X_b with the ATLAS experiment in several final states, including Upsilon pi pi, is presented.
Susan Cheatham
(Lancaster)
14/04/2016, 10:00
Heavy Flavours (Charm, Beauty and Top)
New measurements of prompt and non-prompt J/psi and of Upsilon production at a centre-of mass energy of 13 TeV are presented. Comparisons with theoretical predictions and precision measurements made at energies of 2.76, 7 and 8 TeV are discussed.
Dr
Zhiguo He
(Hamburg University)
14/04/2016, 11:00
Heavy Flavours (Charm, Beauty and Top)
We perform a complete study of prompt double $J/\psi$ hadroproduction at
leading order in the nonrelativistic-QCD factorization framework by including
all possible pairings of the $c\bar{c}$ Fock states ${}^1\!S_0^{[8]}$,
${}^3\!S_1^{[1,8]}$, and ${}^3\!P_J^{[1,8]}$ with $J=0,1,2$.
We find that the ${}^1\!S_0^{[8]}$ and ${}^3\!P_J^{[8]}$ channels of
$J/\psi$ and $\psi^\prime$ production...
Dr
Mathias Butenschön
(Universität Hamburg)
14/04/2016, 11:20
Heavy Flavours (Charm, Beauty and Top)
Over 30 years of the J/psi discovery the mechanisms behind quarkonium production are still not fully understood. The effective field theory framework of Nonrelativistic QCD (NRQCD) provides a rigorous factorization theorem for quarkonium production, which has become a standard description, also due to its phenomenological successes. In this talk we will review the state of the art in the field...
Sergey Baranov
(Lebedev Institute of Physics)
14/04/2016, 11:40
Heavy Flavours (Charm, Beauty and Top)
We provide a detailed study of prompt double J/ψ production within the non-relativistic QCD (NRQCD) framework in proton-proton collisions at the LHC. We confront the recent LHC data with the results obtained at leading-order (LO) in the NRQCD framework within two approaches of the collinear factorization and the kT-factorization. We show that the LHCb data can be fairly described within the...
Jean-Philippe Lansberg
(IPN Orsay - Paris Sud U. - CNRS/IN2P3)
14/04/2016, 12:00
Heavy Flavours (Charm, Beauty and Top)
In this talk, I will focus on the study of associated-quarkonium production in a number of channels at the LHC. First, I will address the case of quarkonium-pair production [1,2,3] which has recently been studied by LHCb [4], CMS [5] and D0 [6,7]. I will argue that the inclusion of Double-Parton Scattering (DPS) and Next-to-Leading Order (NLO) contributions are necessary to account for the...
Elisa Fioravanti
(INFN and Uniersity of Ferrara)
14/04/2016, 12:20
Heavy Flavours (Charm, Beauty and Top)
We study the reaction e+ e− -> gamma_ISR J/psi, where J/psi -> pi+ pi- pi0, and J/psi -> K+ K- pi0, using events obtained from the Initial State Radiation process. We measure the relative J/psi branching fraction and perform a Dalitz plot analysis of both J/psi decay modes using an isobar and a Veneziano model.
We present also an analysis of the process gamma gamma -> K anti-K pi. We...
