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ACAT 2008

3–7 Nov 2008
Ettore Majorana Foundation and Centre for Scientific Culture
Europe/Zurich timezone

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Methodology of Computations in Theoretical Physics - Session 1

3 Nov 2008, 14:00
Ettore Majorana Foundation and Centre for Scientific Culture

Ettore Majorana Foundation and Centre for Scientific Culture

Via Guarnotta, 26 - 91016 ERICE (Sicily) - Italy Tel: +39-0923-869133 Fax: +39-0923-869226 E-mail: hq@ccsem.infn.it

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  1. 206. Unitarity Methods For 1-Loop Amplitudes
    Warren Perkins (Swansea University UK)
    03/11/2008, 14:00
    3. Computation in Theoretical Physics
    Parallel Talk
    Unitarity methods provide an efficient way of calculating 1-loop amplitudes for which Feynman diagram techniques are impracticable. Recently several approaches have been developed that apply these techniques to systematically generate amplitudes. The 'canonical basis' implementation of the unitarity method will be discussed in detail and illustrated using seven point QCD processes.
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  2. 180. From moments to functions in higher order QCD
    Johannes Bluemlein (DESY)
    03/11/2008, 14:25
    3. Computation in Theoretical Physics
    Parallel Talk
    We present a method to unfold the complete functional dependence of single-scale quantities as QCD splitting functions and Wilson coefficients from a finite number of moments. These quantities obey recursion relations which can be found in an automated way. The exact functional form is obtained solving the corresponding difference equations. We apply the algorithm to the QCD Wilson...
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  3. 56. Computational aspects for three-loop DIS calculations
    Dr Mikhail Rogal (DESY)
    03/11/2008, 14:50
    3. Computation in Theoretical Physics
    Parallel Talk
    will be sent later
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  4. 226. Recent developments of GRACE
    Dr Yoshimasa KURIHARA (KEK)
    03/11/2008, 15:15
    3. Computation in Theoretical Physics
    Parallel Talk
    Automatic Feynman-amplitude calculation system, GRACE, has been extended to treat next-to-leading order (NLO) QCD calculations. Matrix elements of loop diagrams as well as those of tree level ones can be generated using the GRACE system. A soft/collinear singularity is treated using a leading-log subtraction method. Higher order re-summation of the soft/collinear correction by the parton...
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