One-Loop Soft Theorems via Dual Superconformal Symmetry
High Energy Physics - Theory
2016-04-20 v1 High Energy Physics - Phenomenology
Abstract
We study soft theorems at one loop in planar N=4 super Yang-Mills theory through finite order in the infrared regulator and to subleading order in the soft parameter {\delta}. In particular, we derive a universal constraint from dual superconformal symmetry, which we use to bootstrap subleading log {\delta} behaviour. Moreover, we determine the complete infrared-finite subleading soft contribution of n-point MHV amplitudes using momentum twistors. Finally, we compute the subleading log {\delta} behaviour of one-loop NMHV ratio functions at six and seven points, finding that universality holds within but not between helicity sectors.
Keywords
Cite
@article{arxiv.1511.06716,
title = {One-Loop Soft Theorems via Dual Superconformal Symmetry},
author = {Andreas Brandhuber and Edward Hughes and Bill Spence and Gabriele Travaglini},
journal= {arXiv preprint arXiv:1511.06716},
year = {2016}
}
Comments
40 pages, 5 figures