Supersymmetric Regularization, Two-Loop QCD Amplitudes and Coupling Shifts

Details Supersymmetric Regularization, Two-Loop QCD Amplitudes and Coupling Shifts Supersymmetric Regularization, Two-Loop QCD Amplitudes and Coupling Shifts

Publishing date

2002-02-28

URL

arxiv.org/abs/hep-ph/0202271v2

Journals

Phys.Rev.D66:085002,2002

Science

Physics

Field

High Energy Physics

SubField

High Energy Physics - Phenomenology

Additional info

44 pages, minor corrections and clarifications included

Type

Scientific paper

Digital Object Identifier

10.1103/PhysRevD.66.085002

Abstract

We present a definition of the four-dimensional helicity (FDH) regularization scheme valid for two or more loops. This scheme was previously defined and utilized at one loop. It amounts to a variation on the standard 't Hooft-Veltman scheme and is designed to be compatible with the use of helicity states for "observed" particles. It is similar to dimensional reduction in that it maintains an equal number of bosonic and fermionic states, as required for preserving supersymmetry. Supersymmetry Ward identities relate different helicity amplitudes in supersymmetric theories. As a check that the FDH scheme preserves supersymmetry, at least through two loops, we explicitly verify a number of these identities for gluon-gluon scattering (gg to gg) in supersymmetric QCD. These results also cross-check recent non-trivial two-loop calculations in ordinary QCD. Finally, we compute the two-loop shift between the FDH coupling and the standard MS-bar coupling, alpha_s. The FDH shift is identical to the one for dimensional reduction. The two-loop coupling shifts are then used to obtain the three-loop QCD beta function in the FDH and dimensional reduction schemes.

Affiliated with

Also associated with

No associations

Rating

Supersymmetric Regularization, Two-Loop QCD Amplitudes and Coupling Shifts does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Supersymmetric Regularization, Two-Loop QCD Amplitudes and Coupling Shifts, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Supersymmetric Regularization, Two-Loop QCD Amplitudes and Coupling Shifts will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-328621