Asymptotic Charges and Coherent States in QCD
Abstract
We study the connection between asymptotic symmetries in non-Abelian gauge theories and the generalised coherent states following from the application to QCD of the Faddeev-Kulish approach to asymptotic dynamics. We compute the large gauge transformation properties of the soft evolution operators and use this to define the quantum corrected, non-linear contribution to the asymptotic charges. We then compute the one-loop, leading IR-divergent, correction to matrix elements of the charges inserted between dressed scattering states and show that the results depend on a particular order of soft limits. For one choice of ordering we find that the conservation law for the asymptotic charges is not corrected, while for a second we find a correction proportional to the one-loop soft current.
Keywords
Cite
@article{arxiv.1906.11763,
title = {Asymptotic Charges and Coherent States in QCD},
author = {Riccardo Gonzo and Tristan McLoughlin and Diego Medrano and Anne Spiering},
journal= {arXiv preprint arXiv:1906.11763},
year = {2021}
}
Comments
28 pages, 11 figures; v4:matches published version