LL2014 - (other Loops and Legs conferences)
27 April 2014 - 02 May, 2014
Weimar, Germany
published August 20, 2014
The bi-annual international conference “Loops and Legs in Quantum Field Theory” has been held at Weimar, Germany, from April 27 to May 02, 2014. It has been the 12th conference of this series, started in 1992. The main focus of the conference are precision calculations of multi- loop and multi-leg processes in elementary particle physics for processes at present and future high-energy facilities within and beyond the Standard Model. At present many physics questions studied deal with processes at the LHC and future facilities like the ILC. A growing number of contributions deals with important developments in the field of computational technologies and algorithmic methods, including large-scale computer algebra, efficient methods to compute large numbers of Feynman diagrams, analytic summation and integration methods of various kinds, new related function spaces, precise numerical methods and Monte Carlo simulations. The present conference has been attended by more than 110 participants from all over the world, presenting more than 75 contributions, most of which have been written up for these pro- ceedings. The present volume demonstrates in an impressive way the enormous development of the field during the last few years, reaching the level of 5-loop calculations in QCD and a like- wise impressive development in massive next-to-leading order and next-to-next-to-leading order processes. Computer algebraic and numerical calculations require terabyte storage and many CPU years, even after intense parallelization, to obtain state-of-the-art theoretical predictions. The city of Weimar gave a suitable frame to the conference, with its rich history, especially in literature, music, arts, and architecture. Goethe, Schiller, Wieland, Herder, Bach and Liszt lived there and created many of their masterpieces. The many young participants signal that our field is prosperous and faces an exciting future. The conference hotel “Kaiserin Augusta” offered a warm hospitality and excellent working conditions. We would like to thank Martina Mende for all her work in helping to organize this conference. Details of the conference can be found under: https://indico.desy.de/conferenceDisplay.py?confId=8107 2
Sessions
Plenary 1
Plenary 2
Parallel 1
Parallel 2
Parallel 3
Parallel 4
Plenary 3
Parallel 5
Parallel 6
Parallel 7
Parallel 8
Plenary 4
Plenary 1
Preface
J. Bluemlein, P. Marquard and T. Riemann
Second order QCD corrections to gluonic jet production at hadron colliders
J. Currie, A. Gehrmann-De Ridder, T. Gehrmann, N. Glover, J.R. Pires and S. Wells
Towards differential top-anti-top production at NNLO
A. Gehrmann-De Ridder, G. Abelof, P. Maierhöfer and S. Pozzorini
Two-loop corrections to top anti-top and ZZ/WW production
A. von Manteuffel
Magnus and Dyson Series for Master Integrals
P. Mastrolia, M. Argeri, S. Di Vita, E. Mirabella, J. Schlenk, U. Schubert and L. Tancredi
Towards Higgs production at N3LO
C. Duhr
Plenary 2
Bounding the Higgs width at the LHC
K.R. Ellis
NLO corrections to Z production in association with several jets
C. Reuschle, D. Goetz, C. Schwan and S. Weinzierl
Multi-loop integrand reduction techniques
S. Badger, H. Frellesvig and Y. Zhang
Universality in W+Multijet Production
K. Ozeren, Z. Bern, L. Dixon, S. Hoeche, F. Febres Cordero, H. Ita, D.A. Kosower and D. Maitre
Improving Higgs predictions with resummation
F. Petriello
Parallel 1
Three-loop beta function for the Higgs self-coupling
M. Zoller
3-Loop Heavy Flavor Corrections in Deep-Inelastic Scattering with Two Heavy Quark Lines
J. Ablinger, J. Bluemlein, A. De Freitas, A. Hasselhuhn, A. von Manteuffel, M. Round, C. Schneider and F. Wissbrock
The nf terms of the three-loop cusp anomalous dimension in QCD
J. Henn, A.G. Grozin, G. Korchemsky and P. Marquard
Recent Symbolic Summation Methods to Solve Coupled Systems of Differential and Difference Equations
J. Bluemlein, A. De Freitas and C. Schneider
Evaluating multiloop Feynman integrals by differential equations
V. Smirnov
The package HarmonicSums: Computer Algebra and Analytic Aspects of Nested Sums
J. Ablinger
Nested (inverse) binomial sums and new iterated integrals for massive Feynman diagrams
J. Ablinger, J. Bluemlein, C.G. Raab and C. Schneider
Four-dimensional formulation of the sector improved residue subtraction
D. Heymes
Parallel 2
Automated one-loop calculations with GoSam 2.0
G. Heinrich
Next-to-leading order simulations with Sherpa+OpenLoops
P. Maierhöfer, F. Cascioli, S. Hoeche, F. Krauss, N. Moretti, S. Pozzorini, M. Schoenherr and F. Siegert
Automatizing one-loop computation in the SM with RECOLA
S. Uccirati, A. Denner, L. Hofer and A. Scharf
Beyond the t-channel Approximation: Next-to-Leading Order QCD Corrections to Electroweak Higgs Boson Production Plus Three Jets Production at the LHC
T. Figy, F. Campanario, S. Plätzer and M. Sjodahl
A unified NLO description of top-pair and associated Wt production
F. Cascioli, S. Kallweit, P. Maierhöfer and S. Pozzorini
Vector boson pair production at NNLO
M. Grazzini
Parallel 3
Next-to-Next-to-Leading Order QCD Corrections to Higgs Boson Pair Production
J. Mazzitelli and D. De Florian
Mass-corrections to double-Higgs production & TopoID
J. Grigo and J. Hoff
Precision tools for Higgs physics
Z. Trocsanyi, M.V. Garzelli and A. Kardos
Fully Automated Calculations in the Complex MSSM
S. Heinemeyer, T. Hahn, F. von der Pahlen, H. Rzehak and C. Schappacher
Higher-order contributions in Higgs sectors of supersymmetric models
H. Rzehak, T. Hahn, S. Heinemeyer, W. Hollik and G.R. Weiglein
Momentum Dependent Two-Loop Corrections to the Neutral Higgs Boson Masses in the MSSM
S. Borowka
Parallel 4
GRACE for ILC
J. Fujimoto, K.H. Phan and Y. Kurihara
New Developments in FormCalc 8.4
C. Groß, T. Hahn, S. Heinemeyer, F. von der Pahlen, H. Rzehak and C. Schappacher
New applications of CARLOMAT
K. Kolodziej
Non-leptonic B-decays at two-loops in QCD
T. Huber
Recent progress in higher order computations for the physics of the Higgs boson
N. Greiner, H. van Deurzen, J.W. Huston, G. Luisoni, P. Mastrolia, E. Mirabella, G. Ossola, T. Peraro, J.F. von Soden-Fraunhofen, F. Tramontano, J. Winter and V. Yundin
Summing Large-N Towers in Colour Flow Evolution
Plenary 3
A calculation of the three-loop helicity-dependent splitting functions in QCD
A. Vogt, S. Moch and J.A.M. Vermaseren
Recent progress on the calculation of three-loop heavy flavor Wilson coefficients in Deep-Inelastic Scattering
A. De Freitas, J. Ablinger, A. Behring, J. Bluemlein, A. Hasselhuhn, A. von Manteuffel, C.G. Raab, M. Round, C. Schneider and F. Wissbrock
B_s -\rightarrow mu^+ mu^- and Bbar -\rightarrow X_s ganna to NNLO
M. Steinhauser
O(alpha_s alpha) corrections to Drell-Yan processes in the resonance region
S. Dittmaier, A. Huss and C. Schwinn
One-loop Single Real Emission Contributions to Inclusive Higgs Production at NNNLO
W. Kilgore
Parallel 5
What can we learn from Knizhnik-Zamolodchikov Equations?
D. Kreimer
QCD evolution equations from conformal symmetry
V. Braun and A.N. Manashov
Feynman integrals via hyperlogarithms
E. Panzer
Electroweak precision tests in the LHC era and beyond
A. Freitas
Higher-order hadronic and heavy-lepton contributions to the anomalous magnetic moment
Non-planar Feynman integrals, Mellin-Barnes representations, multiple sums
J. Gluza
Schouten identities and the two-loop sunrise graph
L. Tancredi
Parallel 6
Determination of the top quark mass
S.O. Moch
NNLO antenna subtraction for heavy quark pair production
O. Dekkers
Bottom Quark Mass from $\Upsilon$ Sum Rules to $\cal O(\alpha_{s}^{3})$
N. Zerf
Helicity amplitudes with off-shell partons
A. van Hameren
Electroweak corrections to hadronic Z + 2 jets production
A. Denner, L. Hofer, A. Scharf and S. Uccirati
The new PV prescription for IR singularities of NLO splitting functions
M. Skrzypek, O. Gituliar, S. Jadach and A. Kusina
Higher-order soft and Coulomb corrections to squark and gluino production at the LHC
M. Beneke, P. Falgari, J. Piclum, C. Schwinn and C. Wever
Parallel 7
Two loop structure of QCD vertices
J. Gracey
Transverse-momentum resummation and the structure of hard factors at the NNLO
L. Cieri
Color decomposition of multi-quark one-loop QCD amplitudes
C. Reuschle and S. Weinzierl
High multiplicity processes with BlackHat and Sherpa
S. Bartle, Z. Bern, F. Febres Cordero, J.R. Andersen, S. Hoeche, H. Ita, D.A. Kosower, N.A. Lo Presti, D. Maitre and K. Ozeren
Higher-order QCD corrections to associated VH production with $H \rightarrow b \bar b$ decay at the LHC
G. Ferrera
Resummed Higgs pT distribution at NNLO+NNLL in bottom-quark annihilation
R. Harlander, A. Tripathi and M. Wiesemann
Parallel 8
The loop-tree duality at work
S. Buchta, G. Chachamis, I. Malamos, I. Bierenbaum, P. Draggiotis and G. Rodrigo
Two-loop corrections to (g-2) muon in SM and MSSM
H. Stoeckinger-Kim
Quark and gluon spin-2 form factors to two loops in QCD
V. Ravindran, D. De Florian, P. Mathews, J. Mazzitelli and M. Mahakhud
Infrared singularities in multi-leg scattering amplitudes
E. Gardi
Recent new methods and applications of the differential equation approach to master integrals
C. Wever, C. Papadopoulos and D. Tommasini
COLLIER – A fortran-library for one-loop integrals
L. Hofer, A. Denner and S. Dittmaier
Plenary 4
Bounding the Higgs Width Using Effective Field Theory
G. Passarino, M. Ghezzi and S. Uccirati
Progress on the infrared structure of multi-particle gauge theory amplitudes
L. Magnea
Testing Quantum Electrodynamics with Positronium State
A. Penin
Xtreme manipulations
J.A.M. Vermaseren
Two-loop results on the renormalization of vacuum expectation values, infrared divergences in the FDH scheme
D. Stöckinger
Bootstrapping six-gluon scattering in planar N=4 super-Yang-Mills theory
L. Dixon, J. Drummond, C. Duhr, M. von Hippel and J. Pennington
Algebraic geometry informs perturbative quantum field theory
D. Broadhurst