QCD evolution of the gluon density in a nucleus

被引：126

作者：

Ayala, AL

Ducati, MBG

Levin, EM

机构：

[1] UNIV FED PELOTAS,INST FIS & MATEMAT,BR-96010900 PELOTAS,RS,BRAZIL

[2] CTR BRASILEIRO PESQUISAS FIS,LAFEX,CNPQ,BR-22290180 RIO JANEIRO,RJ,BRAZIL

[3] PETERSBURG NUCL PHYS INST,THEORY DEPT,GATCHINA 188350,ST PETERSBURG,RUSSIA

来源：

NUCLEAR PHYSICS B | 1997年 / 493卷 / 1-2期

关键词：

perturbative QCD; evolution equation; Glauber formula; gluon structure function;

D O I：

10.1016/S0550-3213(97)00002-3

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

The Glauber approach to the gluon density in a nucleus, suggested by A. Mueller, is developed and studied in detail. Using the GRV parameterization for the gluon density in a nucleon, the value as well as energy and Q(2) dependence of the gluon density in a nucleus is calculated. It is shown that the shadowing corrections are under theoretical control and are essential in the region of small x. They crucially change the value of the gluon density as well as the value of the anomalous dimension of the nuclear structure function, unlike that of the nucleon. The systematic theoretical way to treat the corrections to the Glauber approach is developed and a new evolution equation is derived and solved. It is shown that the solution of the new evolution equation can provide a self-consistent matching of ''soft'' high energy phenomenology with ''hard'' QCD physics. (C) 1997 Published by Elsevier Science B.V.

引用

页码：305 / 353

页数：49

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