Fusing Gauge Theory Tree Amplitudes Into Loop Amplitudes

Details Fusing Gauge Theory Tree Amplitudes Into Loop Amplitudes Fusing Gauge Theory Tree Amplitudes Into Loop Amplitudes

1994-09-09

arxiv.org/abs/hep-ph/9409265v1

Nucl.Phys.B435:59-101,1995

Physics

High Energy Physics

High Energy Physics - Phenomenology

49 pages, SLAC-PUB-6563

Scientific paper

10.1016/0550-3213(94)00488-Z

We identify a large class of one-loop amplitudes for massless particles that can be constructed via unitarity from tree amplitudes, without any ambiguities. One-loop amplitudes for massless supersymmetric gauge theories fall into this class; in addition, many non-supersymmetric amplitudes can be rearranged to take advantage of the result. As applications, we construct the one-loop amplitudes for $n$-gluon scattering in $N=1$ supersymmetric theories with the helicity configuration of the Parke-Taylor tree amplitudes, and for six-gluon scattering in $N=4$ super-Yang-Mills theory for all helicity configurations.

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