Bacchetta, Alessandro and Schaefer, Andreas and Yang, Jian-Jun (2004) Sivers function in a spectator model with axial-vector diquarks. PHYSICS LETTERS B, 578 (1-2). pp. 109-118. ISSN 0370-2693, 1873-2445
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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.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | SINGLE-SPIN ASYMMETRIES; FINAL-STATE INTERACTIONS; MOMENTUM DEPENDENT DISTRIBUTION; DEEP-INELASTIC SCATTERING; FRAGMENTATION FUNCTIONS; PARTON DISTRIBUTIONS; PION-PRODUCTION; AZIMUTHAL ASYMMETRIES; DRELL-YAN; NUCLEON; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics > Chair Professor Schäfer > Group Andreas Schäfer |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 27 Jul 2021 08:28 |
| Last Modified: | 27 Jul 2021 08:28 |
| URI: | https://pred.uni-regensburg.de/id/eprint/38251 |
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