Particle and Astro-Particle Physics Seminars
High-Energy Limit of Mass-Suppressed Amplitudes in Gauge Theories
by
→
Europe/Zurich
4/3-006 - TH Conference Room (CERN)
Description
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.
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.