We detail the calculation of two-loop all-plus helicity amplitudes for pure Yang-Mills theory. The four dimensional unitarity methods and augmented recursion techniques we have developed, together with a knowledge of the singular structure of the amplitudes allow us to compute these in compact analytic forms. Specifically we present the computation and analytic results for the six- and seven-gluon leading colour two-loop amplitudes these being the first QCD two-loop amplitudes beyond five-points.
@article{arxiv.1710.10071,
title = {Analytic all-plus-helicity gluon amplitudes in QCD},
author = {David C. Dunbar and John H. Godwin and Guy R. Jehu and Warren B. Perkins},
journal= {arXiv preprint arXiv:1710.10071},
year = {2017}
}
Comments
30 pages 4 figures; title changed to match journal