Beauty and magic of QCD at high energy (High-Energy Limit of Mass-Suppressed Amplitudes in Gauge Theories)

by A.A. Penin (U. Alberta)

Friday 14 Dec 2018, 11:45 → 13:00 Europe/Madrid

IFAE Seminar room (IFAE)

Abstract: 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.