Sivers function in a spectator model with axial-vector diquarks

被引：117

作者：

Bacchetta, A ^{[1
]}

Schäfer, A ^{[1
]}

Yang, HJ ^{[1
]}

机构：

[1] Univ Regensburg, Inst Theoret Phys, D-93040 Regensburg, Germany

来源：

PHYSICS LETTERS B | 2004年 / 578卷 / 1-2期

关键词：

D O I：

10.1016/j.physletb.2003.10.045

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We perform a calculation of the Sivers function in a spectator model of the nucleon, with scalar and axial-vector diquarks. We make use of gluon rescattering to produce the nontrivial phases necessary to generate the Sivers; function: The inclusion of axial-vector diquarks enables us to obtain a nonzero Sivers function for down quarks. Using the results of our model, we discuss the phenomenology of transverse single spin asymmetries in pi(+), pi(-), and pi(0) production, which are currently analysed by the HERMES and COMPASS Collaborations. We find that the inclusion of axial-vector diquarks substantially reduces the asymmetries. (C) 2003 Elsevier B.V. All rights reserved.

引用

页码：109 / 118

页数：10

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