Mr
Benedikt Biedermann
(Humboldt Universität zu Berlin)

9/8/11, 2:00 PM

Track 3: Computations in Theoretical Physics - Techniques and Methods

Parallel talk

We present the publicly available program NGLUON allowing the
numerical evaluation of colour-ordered amplitudes at one-loop
order in massless QCD.
The program allows the evaluation of one-loop amplitudes
for an arbitrary number of gluons. We discuss in detail the speed as
well as the numerical stability. In addition the packages allows the
evaluation of one-loop scattering amplitudes...

Dr
Fukuko Yuasa
(KEK)

9/8/11, 2:25 PM

Track 3: Computations in Theoretical Physics - Techniques and Methods

Parallel talk

We report our progress on the development of the
Direct Computation Method (DCM), which is a fully
numerical method for the computation of Feynman diagrams.
Based on a combination of a numerical integration tool
and a numerical extrapolation technique, all steps in
the computation are carried out in a fully numerical
way. The combined method is applicable to one-, two-
and multi-loop...

Tord Riemann
(DESY)

9/8/11, 2:50 PM

Track 3: Computations in Theoretical Physics - Techniques and Methods

Parallel talk

The algebraic tensor reduction of one-loop Feynman integrals with signed minors has been further developed.
There is now available the
C++ package PJFry by V. Yundin for the reduction of 5-point 1-loop tensor integrals up to rank 5.
Special care is devoted to vanishing or small Gram determinants.
Further, we derived
extremely compact expressions for the contractions of the tensor...

Prof.
Toshiaki Kaneko
(KEK)

9/8/11, 3:15 PM

Track 3: Computations in Theoretical Physics - Techniques and Methods

Parallel talk

Numerically stable analytic expression of a one-loop integration
is one of the most important elements of the accurate
calculations of one-loop corrections to the physical processes.
It is known that these integrations are expressed by some
generalized classes of Gauss hypergeometric functions. Power
series expansions, differential equations, contiguous and many
other identities are...

Gudrun Heinrich
(Max Planck Institute Munich)

9/8/11, 4:10 PM

Track 3: Computations in Theoretical Physics - Techniques and Methods

Parallel talk

A program package will be presented which aims at the automated calculation of
one-loop amplitudes for multi-particle processes.
The program offers the possibility to optionally use either unitarity cuts
or traditional tensor reduction of Feynman diagrams, or a combination of both.
It can be used to calculate one-loop corrections to both QCD and electro-weak theory.
Beyond the Standard...

Dr
Attilio Santocchia
(Universita e INFN Perugia)

9/8/11, 4:35 PM

Track 3: Computations in Theoretical Physics - Techniques and Methods

Parallel talk

Octave is one if the most used open source tools for numerical analysis
and liner algebra. Our project wants to improve Octave introducing the support for GPU computing, in order to speed up some linear algebra operations. The core of our work is a C library that executes on GPU some BLAS operations concerning vector-vector, vector-matrix and matrix-matrix functions. OpenCL functions are used...