Asymptotic charges and coherent states in QCD

Abstract

We study the connection between asymptotic symmetries in non-Abelian gauge theories and the generalized 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, nonlinear contribution to the asymptotic charges. We then compute the leading IR-divergent part of the one-loop correction to matrix elements of the charges and show that, with a specific ordering of soft limits, the asymptotic charges continue to be conserved at this order.