Kivel, N. and Polyakov, M. V. and Schaefer, Andreas and Teryaev, O. V. (2001) Wandzura-Wilczek approximation for the twist-3 DVCS amplitude. PHYSICS LETTERS B, 497 (1-2). pp. 73-79. ISSN 0370-2693
Full text not available from this repository. (Request a copy)Abstract
We present a derivation of Wandzura-Wilczek (WW) like relations for skewed parton distributions. It is demonstrated for photon-pion scattering that the skewed twist-3 parton distributions contributing to the DVCS amplitude have discontinuities at the points x = +/-xi in the WW approximation. This may lead to a violation of factorisation for the twist-3 DVCS amplitude with transverse polarization of the virtual photon. We show, however, that the contribution of the divergencies to the scattering of a transversely polarized virtual photon affects DVCS observables only at order 1/Q(2) and can be neglected at twist-3 accuracy. For the scattering of a longitudinally polarized photon the twist-3 amplitude is free of such divergencies. (C) 2001 Published by Elsevier Science B.V.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | VIRTUAL COMPTON-SCATTERING; EVOLUTION-EQUATIONS; QCD; DISTRIBUTIONS; OPERATORS; NUCLEON; ELECTROPRODUCTION; FACTORIZATION; MESONS; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics > Chair Professor Schäfer > Group Andreas Schäfer |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 22 Feb 2022 08:04 |
| Last Modified: | 22 Feb 2022 08:04 |
| URI: | https://pred.uni-regensburg.de/id/eprint/41813 |
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