Fusing gauge theory tree amplitudes into loop amplitudes
Abstract
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.
- Publication:
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Nuclear Physics B
- Pub Date:
- February 1995
- DOI:
- 10.1016/0550-3213(94)00488-Z
- arXiv:
- arXiv:hep-ph/9409265
- Bibcode:
- 1995NuPhB.435...59B
- Keywords:
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- High Energy Physics - Phenomenology;
- High Energy Physics - Theory
- E-Print:
- 49 pages, SLAC-PUB-6563