CGC/saturation approach: A new impact-parameter-dependent model in the next-to-leading order of perturbative QCD

被引：20
作者：
Contreras, Carlos [1 ,2 ]
Levin, Eugene [1 ,2 ,3 ]
Meneses, Rodrigo [4 ]
Potashnikova, Irina [1 ,2 ]
机构：
[1] Univ Tecn Federico Santa Maria, Dept Fis, Avda Espana 1680,Casilla 110-V, Valparaiso, Chile
[2] Ctr Cient Tecnol Valparaiso, Avda Espana 1680,Casilla 110-V, Valparaiso, Chile
[3] Tel Aviv Univ, Raymond & Beverly Sackler Fac Exact Sci, Sch Phys & Astron, Dept Particle Phys, IL-69978 Tel Aviv, Israel
[4] Univ Valparaiso, Fac Ingn, Escuela Ingn Civil, Avda Errazuriz 1834, Valparaiso, Chile
来源：
PHYSICAL REVIEW D | 2016年 / 94卷 / 11期
关键词：
NONLINEAR GLUON EVOLUTION; COLOR GLASS CONDENSATE; TRANSVERSE-MOMENTUM; P(T) DISTRIBUTIONS; ENERGY-DEPENDENCE; MEAN P(T); SATURATION; MULTIPLICITY; EQUATION; COLLISIONS;
D O I：
10.1103/PhysRevD.94.114028
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
This paper is the first attempt to build a color glass condensate/saturation model based on the next-to-leading-order (NLO) corrections to linear and nonlinear evolution in QCD. We assume that the renormalization scale is the saturation momentum and find that the scattering amplitude has geometric scaling behavior deep in the saturation domain with the explicit formula of this behavior at large pi = r(2)Q(s)(2). We build a model that includes this behavior, as well as the known ingredients: (i) the behavior of the scattering amplitude in the vicinity of the saturation momentum, using the NLO Balitsky-Fadin-Kuraev-Lipatov kernel, (ii) the pre-asymptotic behavior of ln (Q(s)(2)(Y)), as a function of Y, and (iii) the impact parameter behavior of the saturation momentum, which has exponential behavior proportional to exp (-mb) at large b. We demonstrate that the model is able to describe the experimental data for the deep inelastic structure function. Despite this, our model has difficulties that are related to the small value of the QCD coupling at Q(s)(Y-0) and the large values of the saturation momentum, which indicate the theoretical inconsistency of our description.
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页数：14
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