Conveners
Computations in Theoretical Physics: Techniques and Methods: Monday
- Michal Malinsky (IFIC/CSIC and University of Valencia)
Computations in Theoretical Physics: Techniques and Methods: Monday
- Radja Boughezal (Argonne National Laboratory)
Computations in Theoretical Physics: Techniques and Methods: Tuesday
- Tord Riemann (DESY)
Computations in Theoretical Physics: Techniques and Methods: Tuesday
- Grigory Rubtsov (INR RAS)
Computations in Theoretical Physics: Techniques and Methods: Thursday
- Daniel Maitre (University of Durham (GB))
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Thomas Hahn (MPI f. Physik)01/09/2014, 14:00Computations in Theoretical Physics: Techniques and MethodsOralThe Cuba library for multidimensional numerical integration has parallelization built in since Version 3. This presentation introduces Version 4 with extended facilities for distributed computation, including support for vectorized and GPU operation.Go to contribution page
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Stanislav Poslavsky (I)01/09/2014, 14:25Computations in Theoretical Physics: Techniques and MethodsOralRedberry is an open source computer algebra system with native support of tensorial expressions. It provides basic computer algebra tools (algebraic manipulations, substitutions, basic simplifications etc.) which are aware of specific features of indexed expressions: contractions of indices, permutational symmetries, multiple index types etc. The high energy physics package includes tools for...Go to contribution page
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Tord Riemann (DESY)01/09/2014, 14:50Computations in Theoretical Physics: Techniques and MethodsOralAMBRE is a Mathematica package for the evaluation of Feynman integrals with the aid of their Mellin-Barnes representations. The new packages for (i) a proper and efficient Mellin-Barnes presentation of non-planar topologies and (II) an automatic derivation of a subsequent representation by multiple sums are presented. The latter one allows a linking of packages for automatic summation.Go to contribution page
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Michael Norbert Borinsky (Humboldt-University Berlin)01/09/2014, 15:15Computations in Theoretical Physics: Techniques and MethodsOralTwo programs, feyngen and feyncop, are presented. feyngen is designed to generate high loop order Feynman graphs for Yang-Mills, QED and $\phi^k$ theories. feyncop can compute the coproduct of these graphs on the underlying Hopf algebra of Feynman graphs. The programs can be validated by exploiting zero dimensional field theory combinatorics and identities on the Hopf algebra which follow...Go to contribution page
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Johann Felix von Soden-Fraunhofen (Max Planck Institute for Physics)01/09/2014, 16:10Computations in Theoretical Physics: Techniques and MethodsOralWe present the version 2.0 of the program package GoSam, which is a public program package to compute one-loop QCD and/or electroweak corrections to multi-particle processes within and beyond the Standard Model. The extended version of the Binoth-Les-Houches-Accord interface to Monte Carlo programs is also implemented. This allows a large flexibility regarding the combination of the...Go to contribution page
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juergen reuter (DESY Hamburg, Germany)01/09/2014, 16:35Computations in Theoretical Physics: Techniques and MethodsOralWe describe the multi-purpose Monte-Carlo event generator WHIZARD for the simulation of high-energy particle physics experiments. Besides the presentation of the general features of the program like SM physics, BSM physics, and QCD effects, special emphasis will be given to the support of the most accurate simulation of the collider environments at hadron colliders and especially at...Go to contribution page
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Karol Kampf (Charles University (CZ))01/09/2014, 17:00Computations in Theoretical Physics: Techniques and MethodsOralThe chiral SU(N) nonlinear sigma model represents one of the simplest case of effective field theory. For the last several decades it has played an extremely important role not only for the low energy phenomenology but also in many other areas of theoretical physics. In this talk we will focus on the tree-level scattering amplitudes of the n-Goldstone bosons. It will be shown that it can be...Go to contribution page
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Vitaly Yermolchyk (Byelorussian State University (BY))01/09/2014, 17:25Computations in Theoretical Physics: Techniques and MethodsOralWe present the Monte Carlo event generator *LePaProGen* for lepton pair production at hadron colliders. LePaProGen focuses on the description of higher-order electroweak radiative corrections. The generator is implementing a new algorithm for the selection of the optimal variables for phase-space parametrization.Go to contribution page
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Gudrun Heinrich (Max Planck Institute for Physics)02/09/2014, 14:00Computations in Theoretical Physics: Techniques and MethodsOralSecDec is a program which can be used for the evaluation of parametric integrals, in particular multi-loop integrals. For a given set of propagators defining the graph, the program automatically constructs a Feynman parameter representation, extracts the singularities in the dimensional regularisation parameter and produces a Laurent series in this parameter, whose coefficients are...Go to contribution page
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David Heymes (RWTH Aachen)02/09/2014, 14:25Computations in Theoretical Physics: Techniques and MethodsOralThe main theoretical tool to provide precise predictions for scattering cross sections of strongly interacting particles is perturbative QCD. Starting at next-to-leading order (NLO) the calculation suffers from unphysical IR-divergences that cancel in the final result. At NLO there exist general subtraction algorithms to treat these divergences during a calculation. Since the LHC...Go to contribution page
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Prof. Elise de Doncker (Western Michigan University)02/09/2014, 14:50Computations in Theoretical Physics: Techniques and MethodsOralThe paper will include numerical integration results for Feynman loop diagrams through 3-loop such as those covered by (Laporta, 2000). While Laporta generated solutions by solving systems of difference equations, the current methods are based on automatic adaptive integration, using iterated integration with programs from the QuadPack package, or multivariate techniques from the ParInt...Go to contribution page
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Dr Mikhail Kompaniets (SPbSU)02/09/2014, 15:15Computations in Theoretical Physics: Techniques and MethodsOralWe present results of the six loop renormalization group calculations of the critical exponents in $O(n)$-symmetric $\phi^4$ theory in the framework of $\epsilon$-expansion (minimal subtraction scheme). Technical details of this calculations are discussed. Obtained results are compared with experimental data and with results of other theoretical approaches like $1/n$ expansion, renormalization...Go to contribution page
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Mr Vladimir Bytev (JINR)02/09/2014, 16:10Computations in Theoretical Physics: Techniques and MethodsOralThe differential reduction algorithm which allow one to express generalized hypergeometric functions with arbitrary values of parameters in terms of functions with fixed values of parameters differing from the original ones by integers is discussed in a context of evaluation of Feynman diagrams. It is shown that the criterion of reducibility of multiloop Feynman integrals can be...Go to contribution page
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Andrey Pikelner (Joint Inst. for Nuclear Research (RU))02/09/2014, 16:35Computations in Theoretical Physics: Techniques and MethodsOralAfter three-loop beta functions for all Standard Model(SM) couplings in $\overline{MS}$ scheme become available, the last missing part for three-loop RGE analysis of SM become two-loop threshold corrections for low-energy input. In this work we present full two-loop Electro-Weak corrections for top and bottom mass, it's Yukawa couplings, Higgs mass and it's self-coupling, and masses of W...Go to contribution page
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Gorazd Cvetic (Santa Maria University)02/09/2014, 17:00Computations in Theoretical Physics: Techniques and MethodsOralPerturbative QCD in the usual mass independent schemes gives us running coupling $a(Q^2) \equiv \alpha_s(Q^2)/\pi$ which has unphysical (Landau) singularities at low squared momenta $|Q^2| < 1 \ {\rm GeV}^2$ (where $Q^2 \equiv -q^2$). Such singularities do not reflect correctly the analytic (holomorphic) properties of spacelike observables ${\cal D}(Q^2)$ such as current correlators or...Go to contribution page
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Dr Shinji Motoki (High Energy Accelerator Research Organization)02/09/2014, 17:25Computing Technology for Physics ResearchOralWith the discovery of Higgs particle in CERN Large Hadron Collider,precision measurements are expected in future International Linear Collider to explore new physics beyond Standard Model. In tandem with experiments, an accurate theoretical prediction is required.To meet such a request, higher order correction in perturbative quantum field theory becomes more and more important and the method...Go to contribution page
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Dr Andrei Kataev (Institute for Nuclear Research of the Academy of Sciences of Russia)04/09/2014, 14:00Computations in Theoretical Physics: Techniques and MethodsOralThe brief review of the modern developments of the studied by Grunberg ,Kataev, Chyla, Mikhailov , Brodsky, Wu , Mojaza and others generalized Brodsky-Lepage-McKenzie approach, for fixinx the sclaes in mutiloop corrections to the renormalization-group invariant observable quantities in QCD are presented. The special attention is paid to the procedure of splitting the perturbative...Go to contribution page
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Jakub Vícha on behalf of Pierre Auger Collaboration (Institute of Physics AS CR)04/09/2014, 14:25Computations in Theoretical Physics: Techniques and MethodsOralCosmic rays of of ultra-high energy (above 10$^{18}$ eV) are very rare events and still of unknown origin. They provide a unique opportunity e.g. to study hadronic interactions at CMS energies more than one order of magnitude higher than it is achievable at LHC. The existence of the most energetic events (around $10^{20}$ eV) is theoretically very hard to explain mostly because of the opacity...Go to contribution page
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David Walz (RWTH Aachen)04/09/2014, 14:50Computations in Theoretical Physics: Techniques and MethodsOralSolving the question of the origin of ultra-high energy cosmic rays (UHECR) requires the development of detailed simulation tools in order to interpret the experimental data and draw conclusions on the UHECR universe. CRPropa is a public Monte Carlo code for the galactic and extragalactic propagation of cosmic ray nuclei above $\sim 10^{17}$ eV, as well as their photon and neutrino...Go to contribution page
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Grigory Rubtsov (INR RAS)04/09/2014, 15:15Computations in Theoretical Physics: Techniques and MethodsOralThe Telescope Array (TA) surface detector (SD) stations record the temporal development of the signal from the extensive air shower front which carries information about the type of the primary particle. We develop methods for studies of the primary mass composition of ultra-high-energy cosmic rays based on multivariate analysis (MVA). We propose to convert each observable into percentile rank...Go to contribution page