High-Energy Limit of QCD beyond Sudakov Approximation

Abstract

We study the high-energy limit of the scattering amplitudes suppressed by the leading power of the quark mass in perturbative quantum chromodynamics. We prove the factorization and perform all-order resummation of the double-logarithmic radiative corrections which determine the asymptotic behavior of the amplitudes. In contrast to the Sudakov logarithms, the mass-suppressed double-logarithmic corrections are induced by soft quark exchange. 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.

5 pages, 11 figures

References in corpus (2)

• Approximate N^3LO Higgs-boson production cross section using physical-kernel constraints
• Three-loop quark form factor at high energy: the leading mass corrections

Cited by in corpus (4)

• Renormalization and Scale Evolution of the Soft-Quark Soft Function
• Resummation of double logarithms in loop-induced processes with effective field theory
• Singlet and non-singlet three-loop massive form factors
• QCD Beyond Leading Power