High-Energy Limit of Mass-Suppressed Amplitudes in Gauge Theories

Tuesday, 23 October 2018 at 11:15, in Y16 G05 - Campus Irchel

We study the high-energy limit of the scattering amplitudes suppressed by the leading power of the quark mass in perturbative QCD. We prove the factorization and perform all-order resummation of the double-logarithmic radiative corrections which determine the asymptotic behavior of the amplitudes. The structure of the corrections and the asymptotic behavior of the amplitudes in this case crucially depend on the color flow in a given process and are determined by the eikonal color charge nonconservation. We present explicit results for the Higgs boson production in gluon fusion mediated by a light-quark loop and for the leading power-suppressed contributions to the quark form factors, which reveal “magical” universality. Nontrivial relations between the asymptotic behavior of different amplitudes and the amplitudes in different gauge theories are found.