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Two-loop helicity amplitudes for fermion-fermion scattering

โœ Scribed by Z. Bern; A. De Freitas

Publisher
Elsevier Science
Year
2004
Tongue
English
Weight
137 KB
Volume
135
Category
Article
ISSN
0920-5632

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โœฆ Synopsis

We discuss the calculation of two-loop helicity amplitudes for quark-quark scattering in QCD and four-gluino scattering in N = 1 supersymmetric Yang-Mills theory. We study the dependence of the results on different variants of dimensional regularization. In particular, we consider the 't Hooft-Veltman and four-dimensional helicity (FDH) schemes. We also discuss ambiguities in continuing the Dirac algebra to D dimensions. For the four-gluino case, once the infrared divergent part of the amplitude is subtracted, the finite remainder is free of these ambiguities.

๐Ÿ“œ SIMILAR VOLUMES

Two-Loop Effective Action for Theories w
Two-Loop Effective Action for Theories with Fermions
โœ B.A. Faizullaev; M.M. Musakhanov ๐Ÿ“‚ Article ๐Ÿ“… 1995 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 557 KB

On the basis of a new approach for the calculation of the effective action developed in our previous works we calculate the effective action (up to two-loop level) for some models containing fermion fields. This method allows us to calculate the fermionic part of the effective action properly. The t