Hammon, Nils and Ehrnsperger, Bruno and Schäfer, Andreas (1998) Single-transverse spin asymmetry in prompt photon production. JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS, 24 (5). pp. 991-1001. ISSN 0954-3899, 1361-6471
Full text not available from this repository.Abstract
Based on a few standard assumptions we calculate the single-spin asymmetry for the collision of a transverse polarized proton and an unpolarized proton for x(F) < 0 (with respect to the polarized proton). In this target fragmentation region the relevant matrix elements are three-gluon correlators. The imaginary phase, mandatory to achieve a non-zero asymmetry, comes from an on-shell inner quark line leaving a related gluon momentum soft and giving rise to different pole structures. The three-gluon correlators are finally estimated as a numerical constant times the unpolarized twist gluon distribution xG(x). Using the first moment of the three-gluon correlators, we further derived a relation between the direction of the colour magnetic field inside the polarized nucleon and the nucleon spin which was also found in sum-rule calculations for the higher twist contributions to nucleon structure functions.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | SUM-RULE CALCULATION; POLARIZED NUCLEON; QCD; REGION; HERA |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics > Chair Professor Schäfer > Group Andreas Schäfer |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 24 Feb 2023 10:04 |
| Last Modified: | 24 Feb 2023 10:04 |
| URI: | https://pred.uni-regensburg.de/id/eprint/49859 |
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