Fusing gauge theory tree amplitudes into loop amplitudes

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.

gauge field theory: Yang-Mills
scattering amplitude: higher-order
higher-order: scattering amplitude
unitarity
supersymmetry
bibliography

References(68)

Figures(0)

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