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ACAT 2011

5–9 Sept 2011
Europe/London timezone

Session

Thursday 08th - Computations in Theoretical Physics

8 Sept 2011, 14:00

Presentation materials

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  1. 44. Numerical evaluation of one-loop QCD amplitudes
    Mr Benedikt Biedermann (Humboldt Universität zu Berlin)
    08/09/2011, 14:00
    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...
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  2. 72. Progress on the Direct Computation Method
    Dr Fukuko Yuasa (KEK)
    08/09/2011, 14:25
    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...
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  3. 85. One-loop tensor Feynman integral reduction with signed minors
    Tord Riemann (DESY)
    08/09/2011, 14:50
    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...
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  4. 52. One-loop integrations with Hypergeometric functions
    Prof. Toshiaki Kaneko (KEK)
    08/09/2011, 15:15
    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...
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  5. 110. Automated one-loop calculations with Golem/Samurai
    Gudrun Heinrich (Max Planck Institute Munich)
    08/09/2011, 16:10
    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...
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  6. 89. GPU Linear algebra extensions for GNU/Octave
    Dr Attilio Santocchia (Universita e INFN Perugia)
    08/09/2011, 16:35
    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...
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