Content area
Abstract
Abstract.
We computed the twist-4 part of the photon spin-flip amplitude in deeply virtual Compton scattering on a nucleon in the Wandzura–Wilczek approximation. We found a factorizable contribution, which arises from photon scattering on quarks with non-zero angular momentum along the collision axis. As the genuine twist-2 amplitude arises at the NLO, for moderate virtualities of the hard photon, \(Q^2 \le 10\) GeV\(^2\), a kinematical twist-4 correction can give a numerically important contribution to the photon helicity-flip amplitude.
Details
Title
Twist-4 photon helicity-flip amplitude in DVCS on a nucleon in the Wandzura-Wilczek approximation
Author
Kivel, N 1 ; Mankiewicz, L 2
1 Institut für Theoretische Physik, Universität Regensburg, 93040 Regensburg, Germany , DE
2 N. Copernicus Astronomical Center, ul. Bartycka 18, 00-716 Warsaw, Poland , PL
1 Institut für Theoretische Physik, Universität Regensburg, 93040 Regensburg, Germany , DE
2 N. Copernicus Astronomical Center, ul. Bartycka 18, 00-716 Warsaw, Poland , PL
Pages
621-629
Publication year
2001
Publication date
Jul 2001
ISSN
14346044
e-ISSN
14346052
Source type
Scholarly Journal
Language of publication
English
ProQuest document ID
2293985054
Copyright
The European Physical Journal C - Particles and Fields is a copyright of Springer, (2001). All Rights Reserved.