Name: Loops and Legs in Quantum Field Theory
Start: 2018-04-29T16:00:00+02:00
End: 2018-05-04T14:30:00+02:00
Location: D-56329 St. Goar, Germany

Sunday 29 April
- Sun 29 Apr
- Mon 30 Apr
- Tue 1 May
- Wed 2 May
- Thu 3 May
- Fri 4 May
- 16:00
  
  Registration
- 18:00
  
  Dinner
- 19:30
  
  Reception
Monday 30 April
- Sun 29 Apr
- Mon 30 Apr
- Tue 1 May
- Wed 2 May
- Thu 3 May
- Fri 4 May
- Plenary 1
  - 1
    
    Welcome
    
    Speaker: Prof. Johannes Bluemlein (DESY)
  - 2
    
    Jet cross sections with NNLOJET
    
    In my talk, I would like to review the phenomenology of LHC observables related to processes newly implemented in the NNLOJET parton level generator.
    
    Speaker: Prof. Aude Gehrmann-De Ridder (ETH, Zurich)
    
    Slides
  - 3
    
    Threshold and jet radius joint resummation for single-inclusive jet production
    
    Speaker: Sven-Olaf Moch (UHH)
    
    Slides
- 10:30
  
  Coffee break
- Plenary 1
  - 4
    
    NNLO corrections to VBF Higgs production
    
    Higgs production through Vector Boson Fusion (VBF) is the most important tree level production channel for Higgs production at the LHC. We present NNLO QCD corrections to differential distributions of H+2j in VBF using the antenna subtraction formalism.
    
    Speaker: Mr Juan Cruz-Martinez (IPPP Durham)
    
    Slides
  - 5
    
    Non-resonant and electroweak corrections to top pair production
    
    Speaker: Andreas Maier (IPPP, Durham University)
    
    Slides
  - 6
    
    Elliptic polylogarithms and two-loop Feynman integrals
    
    Speaker: Dr Claude Duhr (CERN)
    
    Slides
  - 7
    
    Applications of integrand reduction to 5-gluon 2-loop scattering amplitudes in QCD
    
    Speaker: Simon Badger (Edinburgh)
    
    Slides
- 13:00
  
  Lunch
- Parallel 1
  - 8
    
    Charm and Bottom Quark Masses: an Update
    
    Speaker: Prof. Johann Kuehn (KIT)
    
    Slides
  - 9
    
    No-$\pi^2$ Theorem for Euclidean Massless Correlators
    
    Speaker: Dr Konstantin Chetyrkin (Institut für Theoretische Teilchenphysik, KIT)
    
    Slides
  - 10
    
    The massive 3-loop form factor in the planar limit
    
    Speaker: Dr Narayan Rana (DESY)
    
    Slides
- Parallel 2
  - 11
    
    Pentagon functions for non-planar scattering amplitudes
    
    Speaker: Prof. Johannes Henn (JGU Mainz)
    
    Slides
  - 12
    
    Progress in the calculation of the complete set of two-loop five-point master integrals
    
    Speaker: Dr Konstantinos Papadopoulos (NCSR DEMOKRITOS)
    
    Slides
  - 13
    
    Planar Two-Loop Five-Gluon Amplitudes from Numerical Unitarity
    
    Speaker: Dr Ben Page (Freiburg University)
    
    Slides
- 16:00
  
  Coffee break
- Parallel 1
  - 14
    
    Electroweak radiative corrections to polarized Bhabha scattering
    
    Speaker: Dr Andrei Arbuzov (JINR)
    
    Slides
  - 15
    
    Electroweak corrections in the Two-Higgs-Doublet Model and Singlet Extensions of the Standard Model
    
    Speaker: Prof. Stefan Dittmaier (University of Freiburg)
    
    Slides
  - 16
    
    Anomalous triple-gauge-boson interaction in vector-boson pair production with Recola2
    
    Diboson production processes are of great importance in high-energy physics. On one hand, they are sensitive to the gauge-boson self interaction so that their measurement is a crucial test of the Standard Model (SM) description of the gauge-boson dynamics. On the other hand, diboson production at the LHC is a source of background for other SM processes as well as for direct New Physics (NP) searches. Therefore a precise theoretical knowledge of these processes is mandatory not only in view of precision tests of the SM but also in the one of the NP searches. We compute the NLO QCD and NLO electroweak corrections to diboson production processes at the LHC including the effect of the anomalous triple-gauge-boson interactions at NLO QCD accuracy. The anomalous triple-gauge-boson interactions are parametrized in terms of higher-dimension operators in the effective field theory (EFT) framework. Our calculation is the first application of Recola2 to EFT models.
    
    Speaker: Mauro Chiesa (University of Würzburg)
    
    Slides
  - 17
    
    Analytic tools for IR subtraction beyond NLO
    
    Speaker: Prof. Lorenzo Magnea (University of Torino)
    
    Slides
- Parallel 2
  - 18
    
    The rho-parameter at three loops and elliptic functions
    
    Speaker: Abilio De Freitas (DESY)
    
    Slides
  - 19
    
    Some 4-loop results on QCD cusp anomalous dimension
    
    Speaker: Dr Andrey Grozin (Budker Institute of Nuclear Physics)
    
    Slides
  - 20
    
    Numerical evaluation of two-loop amplitudes
    
    Speaker: Mr Stephan Jahn (Max Planck Institute for Physics)
    
    Slides
  - 21
    
    Four gluon Scattering Amplitude at Three Loops in QCD
    
    Speaker: Dr Taushif Ahmed (Mainz University)
    
    Slides
- 18:30
  
  Dinner
Tuesday 1 May
- Sun 29 Apr
- Mon 30 Apr
- Tue 1 May
- Wed 2 May
- Thu 3 May
- Fri 4 May
- Parallel 3
  - 22
    
    Fully Differential Higgs Pair Production in Association With a Vector Boson at NNLO in QCD
    
    We present a fully differential next-to-next-to-leading order calculation of the Higgs pair production in association with a Z boson, which is important for probing the trilinear Higgs self-coupling. The next-to-next-to-leading-order corrections enhance the next-to-leading order total cross sections by a factor of 1.2∼1.5, depending on the collider energy, and change the shape of next-to-leading order kinematic distributions. We discuss how to determine the trilinear Higgs self-coupling using our results.
    
    Speaker: Dr Jian Wang (Technical University of Munich)
    
    Slides
  - 23
    
    Double Higgs Production in the High Energy Limit
    
    Speaker: Mr Joshua Davies (University of Liverpool)
    
    Slides
  - 24
    
    Top quark mass effects in HJ production at NLO
    
    Speaker: Dr Matthias Kerner (Max-Planck-Institut für Physik, München)
    
    Slides
- Parallel 4
  - 25
    
    The Z boson resonance at 2 loops
    
    Speaker: Janusz Gluza (Silesia University)
    
    Slides
  - 26
    
    Five-particle phase-space integrals in QCD
    
    Speaker: Oleksandr Gituliar (Universität Hamburg)
    
    Slides
  - 27
    
    Precise determination of the strong coupling from energy-energy correlation
    
    In this talk we present a determination of the strong coupling from a fit of QCD predictions for energy-energy correlation measured in electron-positron collisions at various center-of-mass energies. Experimental data are compared to precise theoretical calculations incorporating NNLO predictions combined with NNLL resummation in the back-to-back region. Hadronization corrections are assessed using modern shower Monte Carlo programs matched to NLO fixed-order computations.
    
    Speaker: Zoltán Tulipánt (University of Debrecen)
    
    Slides
- 10:30
  
  Coffee break
- Parallel 3
  - 28
    
    Sector-improved residue subtraction: Improvements and Applications
    
    Speaker: Arnd Behring (DESY Zeuthen)
    
    Slides
  - 29
    
    Precision calculations in new physics models
    
    Speaker: Dominik Stoeckinger (TU Dresden)
    
    Slides
  - 30
    
    Multi-Loop Amplitudes in the High-Energy Limit in N = 4 SYM
    
    Speaker: Robin Marzucca (UCLouvain)
    
    Slides
  - 31
    
    On the evaluation of scattering amplitudes with massive particles
    
    Speaker: Dr Amedeo Primo
    
    Slides
- Parallel 4
  - 32
    
    Loop-tree duality at two loops
    
    Speaker: Dr German Rodrigo (IFIC-S8a Valencia)
    
    Slides
  - 33
    
    On the gauge dependence of Quantum Electrodynamics
    
    Speaker: Henry Kißler (HU Berlin)
    
    Slides
  - 34
    
    Top pair production at NNLO
    
    Speaker: Mr Sebastian Sapeta (IFJ PAN, Kraków)
    
    Slides
  - 35
    
    Loopedia, a database for loop integrals
    
    Speaker: Dr Thomas Hahn (Max-Planck Institut für Physik München)
    
    Slides
- 13:00
  
  Lunch
- Parallel 5
  - 36
    
    Multiloop Euler-Heisenberg Lagrangians, Schwinger pair creation and the QED photon amplitudes
    
    Speaker: Prof. Christian Schubert (Instituto de Fisica y Matematicas, Universidad Michoacana de San Nicolas de Hidalgo)
    
    Slides
  - 37
    
    On the Adaptive Integrand Decomposition of Two-loop Scattering Amplitudes
    
    Speaker: William Javier Torres Bobadilla (IFIC CSIC-UV)
    
    Slides
  - 38
    
    Conformal Symmetry and Feynman Integrals
    
    Speaker: Mr Simone Zoia (Johannes Gutenberg University Mainz)
    
    Slides
- Parallel 6
  - 39
    
    NNLO Corrections to W Boson Production
    
    The inclusive production of leptonically decaying W bosons at the LHC is an important reference process for many analyses, and is relevant to our knowledge of the structure of the proton. We will present the results from a calculation of the W boson transverse momentum distribution at NNLO QCD using the method of antenna subtraction.
    
    Speaker: Mr Duncan Walker (IPPP, Durham University)
    
    Slides
  - 40
    
    Regge limit of scattering amplitudes from an anomalous dimension
    
    Speaker: Robin Brüser (Mainz University)
    
    Slides
  - 41
    
    Threshold resummation in rapidity for colorless particle production at the LHC
    
    We present a formalism that resums threshold enhanced logarithms to all orders in perturbative Quantum Chromodynamics for the rapidity distribution of any colorless particle produced in hadron colliders. We achieve this by exploiting the factorization properties and K+G equations satisfied by the soft and virtual parts of the cross section. We compute for the first time, the resummed result in two dimensional Mellin space up to next-to-next-to-next-to-leading logarithmic (N3LL) accuracy. Using various state-of-the-art multi-loop and multi-leg results, we demonstrate the numerical impact of the resummed results up to next-to-next-to-leading order for the rapidity distribution of the Higgs boson and Drell-Yan production at the Large Hadron Collider. We find that these threshold logs in the resummed result stabilise the predictions against the renormalization and factorization scale choices as well as we achieve better perturbative convergence.
    
    Speaker: Dr Goutam Das (DESY, Hamburg)
    
    Slides
- 16:00
  
  Coffee break
- Parallel 5
  - 42
    
    Infrared singularities of QCD scattering amplitudes in the Regge limit to all orders
    
    Speaker: Mr Leonardo Vernazza (Institute für Theoretische Physik E, RWTH Aachen)
    
    Slides
  - 43
    
    Scheme and gauge dependence of the generalized Crewther relation in perturbative QCD
    
    Speaker: Andrei Kataev (Insitute for Nuclear Research of the RAS)
    
    Slides
  - 44
    
    NLO QCD Energy-Energy-Correlations in $e^+ e^-$ Annihilation
    
    Speaker: Dr Vladyslav Shtabovenko (Zhejiang University Hangzhou)
    
    Slides
- Parallel 6
  - 45
    
    Automated calculation of soft functions in SCET
    
    Speaker: Dr Bahman Dehnadi (University of Siegen)
    
    Slides
  - 46
    
    On-the-fly reduction of open loops
    
    Speaker: Dr Max Zoller (University od Zurich (UZH))
    
    Slides
  - 47
    
    MBnumerics: Numerical integration of Mellin-Barnes integrals in physical regions
    
    Speaker: Johann Usovitsch (DESY Zeuthen)
    
    Slides
- 18:00
  
  Dinner
- 20:00
  
  Concert
Wednesday 2 May
- Sun 29 Apr
- Mon 30 Apr
- Tue 1 May
- Wed 2 May
- Thu 3 May
- Fri 4 May
- Plenary 2
  - 48
    
    Hopf algebra for Feynman diagrams and integrals
    
    Speaker: Ruth Britto (Trinity College Dublin)
    
    Slides
  - 49
    
    3-loop coupling for hot gauge theory
    
    Speaker: Dr York Schröder (Universidad del Bio-Bio)
    
    Slides
  - 50
    
    NNLO Parton Distributions for the LHC
    
    Speaker: Sergey Alekhin (DESY)
    
    Slides
- 10:30
  
  Coffee break
- Plenary 2
  - 51
    
    Anomalous dimensions and splitting functions beyond NNLO
    
    Speaker: Prof. Andreas Vogt (University of Liverpool)
    
    Slides
  - 52
    
    Two-mass 3-loop effects for heavy flavor deep inelastic scattering
    
    Speaker: Kay Schönwald (DESY)
    
    Slides
  - 53
    
    Computer algebra tools for Feynman integrals and related multi-sums
    
    Speaker: Dr Carsten Schneider (RISC, J. Kepler University Linz)
    
    Slides
  - 54
    
    Quadratic relations between Feynman integrals
    
    Speaker: Dr David Broadhurst (Open University, UK)
    
    Slides
- 13:00
  
  Lunch
- 15:00
  
  Excursion
- 18:30
  
  Dinner
Thursday 3 May
- Sun 29 Apr
- Mon 30 Apr
- Tue 1 May
- Wed 2 May
- Thu 3 May
- Fri 4 May
- Parallel 7
  - 55
    
    Off-shell Top Quarks with a Jet or a Photon
    
    Speaker: Dr Malgorzata WOREK (RWTH Aachen University)
    
    Slides
  - 56
    
    kT-dependent factorization at one loop
    
    Speaker: Andreas van Hameren (IFJ PAN)
    
    Slides
  - 57
    
    Automated calculation of e+e- -> BSM BSM
    
    Speaker: Sven Heinemeyer (IFCA (CSIC, Santander))
    
    Slides
- Parallel 8
  - 58
    
    The HEPGAME project
    
    Speaker: Dr Jos Vermaseren (Nikhef)
    
    Slides
  - 59
    
    Cuts and Feynman amplitudes beyond polylogarithms
    
    In this talk I will present some of the newest advancements in the calculation of multiloop Feynman amplitudes beyond multiple polylogarithms. In particular, I will show how to solve higher order irreducible differential equations for non-polylogarithmic Feynman integrals and how to write their solution in terms of a suitable basis of functions. I will also comment on the difficulties in embedding these integrals into physically relevant scattering amplitudes for the calculation of important observables for the LHC.
    
    Speaker: Lorenzo Tancredi (KIT Karlsruhe)
    
    Slides
  - 60
    
    An improved Algorithm to compute Inverse Mellin Transforms of Nested Binomial Sums
    
    Speaker: Jakob Ablinger (Johannes Kepler Universität Linz)
    
    Slides
- 10:30
  
  Coffee break
- Parallel 7
  - 61
    
    The next generation of OpenLoops
    
    Speaker: Philipp Maierhöfer (University of Zürich)
    
    Slides
  - 62
    
    $\gamma_{5}$ in FDH
    
    In this talk, we review recent developments of the four-dimensional helicity scheme (FDH) in higher-order calculations, mainly focusing on the consistent treatment of $\gamma_{5}$. We start with distinctive examples and demonstrate that at the one-loop level the recently proposed four-dimensional formulation (FDF) of FDH constitutes a viable and efficient alternative to more traditional approaches. Apart from this, we provide a comprehensive definition of an anticommuting $\gamma_{5}$ in FDH and discuss when it is convenient to use it in FDH multi-loop calculations.
    
    Speaker: Christoph Gnendiger (PSI)
    
    Slides
  - 63
    
    NLO mixed QCD-EW corrections to Higgs gluon fusion
    
    The study of the Higgs boson properties is one of the main tasks of contemporary high-energy physics. Among Higgs properties, its interaction with gluons is interesting since it can be facilitated by yet unknown elementary particles. One of the major sources of uncertainty in the theoretical description of $ggH$ coupling originates from mixed QCD-electroweak contributions. The NLO QCD corrections to these contributions were evaluated few years ago in the approximation where electroweak boson masses were considered to be significantly larger than the mass of the Higgs boson and it is desirable to compute those corrections for physical masses of gauge bosons and Higgs boson. In this talk, I will present a major step towards this goal and describe the analytic evaluation of NLO mixed QCD-EW three-loop virtual corrections to $gg \to H$.
    
    Speaker: Mr Marco Bonetti (TTP KIT)
    
    Slides
  - 64
    
    Soft gluons and top quark pair production
    
    Speaker: Dr Lilin Yang (Peking University)
    
    Slides
- Parallel 8
  - 65
    
    Differential equations for loop integrals in Baikov representation
    
    Speaker: Dr Kasper Larsen (University of Southampton)
    
    Slides
  - 66
    
    Integral relations and parametric annihilators
    
    Speaker: Dr Erik Panzer (University of Oxford)
    
    Slides
  - 67
    
    Automated extraction of UV counterterms for arbitrary local operators
    
    Computing the anomalous dimensions of local composite operators present in both renormalisable and non-renormalisable QFTs is generally challenging due to the presence of many scales and loops. In this talk we present an extension of the local R* method which fully automates this task. By extending the local R* operation to arbitrary QFTs we, transform this problem to one of computing massless propagator integrals, suitable for efficient evaluation with the Forcer program.
    
    Speaker: Dr Ben Ruijl (ETH Zurich)
    
    Slides
  - 68
    
    Analytic Properties of Loop Integrands
    
    Speaker: Pascal Wasser (Johannes Gutenberg Universität Mainz)
    
    Slides
- 13:00
  
  Lunch
- Parallel 10
  - 69
    
    CoLoRFulNNLO for LHC processes
    
    CoLoRFulNNLO is a completely local subtraction scheme for computing fully differential predictions in NNLO QCD. The method has been fully worked out for processes without colored particles in the initial state and has shown its many strengths when it was applied to three-jet production in electron-positron annihilation. In my talk, I will present the extension of the scheme to hadron initiated processes and show the first application of our method to key LHC processes.
    
    Speaker: Dr Adam Kardos (University of Debrecen)
    
    Slides
  - 70
    
    Higgs + Jet production above the top mass threshold
    
    Speaker: Kirill Kudashkin (Karlsruher Institut für Technologie, Institut für Theoretische Teilchenphysik)
    
    Slides
  - 71
    
    Non-planar two-loop Feynman integrals contributing to H+j production at NLO
    
    Speaker: Hjalte Frellesvig (NCSR Demokritos)
    
    Slides
- Parallel 9
  - 72
    
    The corolla polynomial: a graph polynomial on half-edges
    
    Speaker: Prof. Dirk Kreimer (Humboldt University Mathematics and Physics)
    
    Slides
  - 73
    
    From elliptic curves to Feynman integrals
    
    Speaker: Dr Stefan Weinzierl (Univ. Mainz)
    
    Slides
  - 74
    
    Loop calculations for models of graphene
    
    Speaker: John Gracey (University of Liverpool)
    
    Slides
- 16:00
  
  Coffee Break
- Parallel 10
  - 75
    
    Three-loop effective potential
    
    Speaker: Bernd Kniehl (II. Inst. f. Theor. Phys., Univ. Hamburg)
    
    Slides
  - 76
    
    Properties of scattering forms for Yang-Mills amplitudes
    
    Speaker: Leonardo de la Cruz (The University of Edinburgh)
    
    Slides
  - 77
    
    Multi-loop amplitudes and numerical unitarity
    
    Speaker: Prof. Fernando Febres Cordero (Unversity of Freiburg)
    
    Slides
- Parallel 9
  - 78
    
    Gross-Neveu-Yukawa Models at Four Loops
    
    Speaker: Dr Nikolai Zerf (ITP University of Heidelberg)
    
    Slides
  - 79
    
    Evaluating `elliptic' master integrals at special kinematic values: using differential equations and their solutions via expansions near singular points
    
    Speaker: Vladimir Smirnov (Skobeltsyn Institute of Nuclear Physics of Moscow State University)
    
    Slides
  - 80
    
    New Results in four-loop QED
    
    Speaker: Dr Stefano Laporta (University Padova)
    
    Slides
- 19:30
  
  Conference dinner
Friday 4 May
- Sun 29 Apr
- Mon 30 Apr
- Tue 1 May
- Wed 2 May
- Thu 3 May
- Fri 4 May
- Plenary 3
  - 81
    
    Scalar one-loop Feynman integrals in arbitrary space-time dimension
    
    Speaker: Dr Tord Riemann (DESY)
    
    Slides
  - 82
    
    High energy limit of QCD beyond Sudakov approximation
    
    Speaker: Prof. Alexander Penin (University of Alberta)
    
    Slides
  - 83
    
    Precision studies of vector boson production with heavy quarks
    
    Speaker: Prof. Laura Reina (Florida State University)
    
    Slides
- 10:30
  
  Coffee break
- Plenary 3
  - 84
    
    Higher order and top mass effects in Higgs boson pair production within and beyond the Standard Model
    
    Speaker: Gudrun Heinrich (Max Planck Institute for Physics)
    
    Slides
  - 85
    
    Two-loop unitarity and dual conformal symmetry
    
    We show that the power of generalized unitarity cuts extends beyond the construction of integrands. Both integration-by-parts identities and differential equations can be derived on unitarity cuts, using tangent vectors of unitarity cut surfaces. We present applications, from the extraction of symbol alphabets for nonplanar two-loop five-point integrals to the evaluation of UV divergences in 5-loop supergravity. A surprising connection with dual conformal symmetry is presented, which offers an analytic alternative to computational algebraic geometry, and also shines light on the generalization of dual conformal symmetry to nonplanar integrals.
    
    Speaker: Mao Zeng (UC Los Angeles)
    
    Slides
  - 86
    
    Form factors in QCD
    
    Speaker: Prof. Matthias Steinhauser (KIT)
    
    Slides
  - 87
    
    Generalised cuts and Wick rotations
    
    Speaker: Ettore Remiddi (DIFA and INFN, Bologna)
    
    Slides
- 13:00
  
  Lunch

Loops and Legs in Quantum Field Theory

D-56329 St. Goar, Germany

14th Workshop organized by the Theory Group, DESY, Zeuthen