MHV amplitudes in N=2 SQCD and in N=4 SYM at one-loop

被引:8
|
作者
Glover, E. W. Nigel [1 ]
Khoze, Valentin V.
Williams, Ciaran
机构
[1] Univ Durham, Dept Phys, Durham DH1 3LE, England
来源
基金
英国科学技术设施理事会;
关键词
supersymmetric gauge theory; extended supersymmetry; NLO computations; QCD;
D O I
10.1088/1126-6708/2008/08/033
中图分类号
O412 [相对论、场论]; O572.2 [粒子物理学];
学科分类号
摘要
Using four-dimensional unitarity and MHV-rules we calculate the one-loop MHV amplitudes with all external particles in the adjoint representation for N = 2 supersymmetric QCD with N-f fundamental flavours. We start by considering such amplitudes in the superconformal N = 4 gauge theory where the N = 4 supersymmetric Ward identities (SWI) guarantee that all MHV amplitudes for all types of external particles are given by the corresponding tree-level result times a universal helicity- and particle-type-independent contribution. In N = 2 SQCD the MHV amplitudes differ from those for N = 4 for general values of Nf and N-c. However, for Nf = 2N(c) where the N = 2 SQCD is conformal, the N = 2 MHV amplitudes ( with all external particles in the adjoint representation) are identical to the N = 4 results. This factorisation at one-loop motivates us to pose a question if there may be a BDS-like factorisation for these amplitudes which also holds at higher orders of perturbation theory in superconformal N = 2 theory.
引用
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页数:17
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