Final state interactions and gauge invariant parton distributions

被引：530
作者：
Belitsky, AV [1 ]
Ji, X [1 ]
Yuan, F [1 ]
机构：
[1] Univ Maryland, Dept Phys, College Pk, MD 20742 USA
来源：
NUCLEAR PHYSICS B | 2003年 / 656卷 / 1-2期
关键词：
Parton distributions; light-cone gauge; final state interactions; dipole scattering;
D O I：
10.1016/S0550-3213(03)00121-4
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：
Parton distributions contain factorizable final state interaction effects originating from the fast-moving struck quark interacting with the target spectators in deeply inelastic scattering. We show that these interactions give rise to gauge invariance of the transverse momentum-dependent parton distributions. As compared to previous analyses, our study demonstrates the existence of extra scaling contributions from transverse components of the gauge potential at the light-cone infinity. They form a transverse gauge link which is indispensable for restoration of the gauge invariance of Parton distributions in the light-cone gauge where the gauge potential does not vanish asymptotically. Our finding helps to explain a number of features observed in a model calculation of structure functions in the light-cone gauge. (C) 2003 Elsevier Science B.V. All rights reserved.
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收藏
页码：165 / 198
页数：34
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