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Stanislav Poslavsky (IHEP, Protvino)18/01/2016, 14:00Computations in Theoretical Physics: Techniques and MethodsOralWith the increasing complexity of HEP problems, the performance of computer algebra systems (CASs) may become a bottleneck in a real calculation. For example, multiloop calculations in SM may involve thousands of diagrams and require to perform a huge amount of Dirac algebra and related simplifications in order to prepare expressions for further numerical analysis; calculations in field theory...Go to contribution page
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Vladyslav Shtabovenko (TUM)18/01/2016, 14:25Computations in Theoretical Physics: Techniques and MethodsOralWe present the version 9.0.0 of the Mathematica package FeynCalc, which is an open source tool for symbolic evaluation of Feynman diagrams and algebraic calculations in quantum field theory. This talk will focus on the highlights of the new version, that include improved tensor decomposition and partial fractioning routines for loop integrals. We also provide some examples for seamless...Go to contribution page
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Thomas Hahn (MPI f. Physik)18/01/2016, 14:50Computations in Theoretical Physics: Techniques and MethodsOralNew features in FormCalc 9 are presented, most notably the combinability of (almost) arbitrary kinematics in one code and significant updates for the driver programs. Also, a new method for scripting calculations is presented, first used in the implementation of the two-loop $\mathcal{O}(\alpha_t^2)$ Higgs-mass corrections in FeynHiggs.Go to contribution page
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Dr Jens Hoff (Deutsches Elektronen-Synchrotron (DESY))18/01/2016, 15:45Computations in Theoretical Physics: Techniques and MethodsOralComputing the Higgs boson production cross section to N$^3$LO precision is a highly challenging task which demands for automatization to a high degree. This talk will cover two $\tt \text{Mathematica}$ packages that were written in that context but can also be applied to other processes: $\tt \text{MT}$ and $\tt \text{TopoID}$. The package $\tt \text{MT}$ is capable of computing convolution...Go to contribution page
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Takahiro Ueda (Nikhef)18/01/2016, 16:10Computations in Theoretical Physics: Techniques and MethodsOralWe present Forcer, a new FORM program for the calculation of four-loop massless propagators. The basic framework is similar to that of the Mincer program for three-loop massless propagators: the program reduces Feynman integrals to a set of master integrals in a parametric way. To overcome an ineludible complexity of the program structure at the four-loop level, most of the code was...Go to contribution page
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juergen reuter (DESY Hamburg, Germany)18/01/2016, 16:35Computations in Theoretical Physics: Techniques and MethodsOralWe give a status report on the automation of next-to-leading order processes within the Monte Carlo event generator WHIZARD, using GoSam and OpenLoops as provider for one-loop matrix elements. To deal with divergences, WHIZARD uses automated FKS subtraction, and the phase space for singular regions is generated automatically. NLO examples for both scattering and decay processes with a focus...Go to contribution page
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Gudrun Heinrich (MPP Munich)18/01/2016, 17:00Computations in Theoretical Physics: Techniques and MethodsOralIn higher order calculations, multi-dimensional parameter integrals, containing also various types of singularities, are ubiquitous. We will present the program SecDec, which allows to isolate the singularities and numerically calculate their coefficients in a process-independent way. Therefore it can be used as a building block for the automation of higher order corrections beyond...Go to contribution page
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