ACAT 2010

Session

Tuesday, 23 February - Methodology of Computations in Theoretical Physics

23 Feb 2010, 14:00

Jaipur, India

57. Status of the FORM project

Dr Irina Pushkina (NIKHEF)

23/02/2010, 14:00

Methodology of Computations in Theoretical Physics

Parallel Talk

Currently there is a lot of activity in the FORM project. There is much progress on making it open source. Work is done on simplification of lengthy formulas and routines for dealing with rational polynomials are under construction. In addition new models of parallelization are being studied to make optimal use of current multi-processor machines.

75. Parallel versions of the symbolic manipulation system FORM

Mikhail Tentyukov (Karlsruhe University)

23/02/2010, 14:30

Methodology of Computations in Theoretical Physics

Parallel Talk

The symbolic manipulation program FORM is specialized to handle very large algebraic expressions. Some specific features of its internal structure make FORM very well suited for parallelization. We have now parallel versions of FORM, one is based on POSIX threads and is optimal for modern multicore computers while another one uses MPI and can be used to parallelize FORM on clusters and...

110. Deterministic numerical box and vertex integrations for one-loop hexagon reductions

Prof. Elise de Doncker (Western Michigan University)

23/02/2010, 15:00

Methodology of Computations in Theoretical Physics

Parallel Talk

We provide a fully numerical, deterministic integration at the level of the three- and four-point functions, in the reduction of the one-loop hexagon integral by sector decomposition. For the corresponding two- and three-dimensional integrals we use an adaptive numerical approach applied recursively in two and three dimensions, respectively. The adaptive integration is coupled with an...

52. Recursive reduction of tensorial one-loop Feynman integrals

Tord Riemann (DESY)

23/02/2010, 16:00

Methodology of Computations in Theoretical Physics

Parallel Talk

A new reduction of tensorial one-loop Feynman integrals with massive and massless propagators to scalar functions is introduced. The method is recursive: n-point integrals of rank R are expressed by n-point and (n-1)-point integrals of rank (R-1). The algorithm is realized in a Fortran package.

7. Automated Computation of One-loop Scattering Amplitudes

Giovanni Ossola (New York City College of Technology (CUNY))

23/02/2010, 16:30

Methodology of Computations in Theoretical Physics

Parallel Talk

The problem of an efficient and automated computation of scattering amplitudes at the one-loop level for processes with more than 4 particles is crucial for the analysis of the LHC data. In this presentation I will review the main features of a powerful new approach for the reduction of one-loop amplitudes that operates at the integrand level. The method, also known as OPP reduction, is an...