Expanding running coupling effects in the hard Pomeron

被引：39

作者：

Ciafaloni, M ^{[1
]}

Colferai, D

Salam, GP

Stasto, AM

机构：

[1] Univ Florence, Dipartimento Fis, I-50019 Sesto Fiorentino, FI, Italy

[2] Ist Nazl Fis Nucl, Sez Firenze, I-50019 Sesto Fiorentino, FI, Italy

[3] Univ Hamburg, Inst Theoret Phys 2, Hamburg, Germany

[4] Univ Paris 06, LPTHE, F-75005 Paris, France

[5] Univ Paris 07, F-75005 Paris, France

[6] H Niewodniczanski Inst Nucl Phys, PL-31342 Krakow, Poland

来源：

PHYSICAL REVIEW D | 2002年 / 66卷 / 05期

关键词：

D O I：

10.1103/PhysRevD.66.054014

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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.

引用

页数：19

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