Journal
PHYSICAL REVIEW D
Volume 66, Issue 5, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.66.054014
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We study QCD hard processes at scales of order k(2)>>Lambda(2) in the limit in which the beta-function coefficient b is taken to be small, but (alpha) over bar (s)(k(2)) is kept fixed. The (nonperturbative) Pomeron is exponentially suppressed in this limit, making it possible to define purely perturbative high-energy Green's functions. The hard Pomeron exponent acquires diffusion and running coupling corrections which can be expanded in the b parameter and turn out to be dependent on the effective coupling b (alpha) over bar Y-2(s), where Y is rapidity of the process. We provide a general setup for this b expansion and we calculate the first few terms both analytically and numerically.
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