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QCD instantons and the soft pomeron
Authors:Dmitri Kharzeev  Yuri V Kovchegov  Eugene Levin  
Institution:

a Physics Department, Brookhaven National Laboratory, Upton, NY 11973, USA

b RIKEN–BNL Research Center, Brookhaven National Laboratory, Upton, NY 11973, USA

c HEP Department, School of Physics and Astronomy, Tel Aviv University, Tel Aviv 69978, Israel

Abstract:We study the rôle of semiclassical QCD vacuum solutions in high-energy scattering by considering the instanton contribution to hadronic cross sections. We propose a new type of instanton-induced interactions (“instanton ladder”) that leads to the rising with energy cross section σnot, vert, similarsΔ of Regge type (the pomeron). We argue that this interaction may be responsible for the structure of the soft pomeron. The intercept Δ>0 is calculated. It has a nonanalytic dependence on the strong coupling constant, allowing a nonsingular continuation into the nonperturbative region. We derive the pomeron trajectory, which appears to be approximately linear in some range of (negative) momentum transfer t, but exhibits a curvature at small t. Possible rôle of instantons in multiparticle production is also discussed.
Keywords:Pomeron  Instanton  Nonperturbative QCD  High-energy scattering  QCD vacuum  Pomeron trajectory
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