Belitsky, A. V. and Mueller, D. and Kirchner, A. and Schaefer, Andreas (2001) Twist-three analysis of photon electroproduction off the pion. PHYSICAL REVIEW D, 64 (11): 116002. ISSN 0556-2821
Full text not available from this repository.Abstract
We study twist-three effects in spin, charge, and azimuthal asymmetries in deeply virtual Compton scattering on a spin-zero target. Contributions which are power suppressed in 1/Q generate a new azimuthal angle dependence of the cross section that is not present in the leading twist results. On the other hand, the leading twist terms are not modified by the twist-three contributions. They may get corrected at the twist-four level, however. In the Wandzura-Wilczek approximation these new terms in the Fourier expansion with respect to the azimuthal an le are entirely determined by the twist-two generalized parton distributions. We also discuss more general issues such as the general form of the angular dependence of the differential cross section, the validity of factorization at the twist-three level, and the relation of generalized parton distributions to spectral functions.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | VIRTUAL COMPTON-SCATTERING; NONFORWARD PARTON DISTRIBUTIONS; TO-LEADING ORDER; AMPLITUDE; FACTORIZATION; EVOLUTION; QCD; |
| 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 Nov 2021 09:09 |
| Last Modified: | 24 Nov 2021 09:09 |
| URI: | https://pred.uni-regensburg.de/id/eprint/40917 |
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