• Open Access

Twist-3 contributions to wide-angle photoproduction of pions

P. Kroll and K. Passek-Kumerički
Phys. Rev. D 97, 074023 – Published 23 April 2018

Abstract

We investigate wide-angle π0 photoproduction within the handbag approach to twist-3 accuracy. In contrast to earlier work both the 2-particle as well as the 3-particle twist-3 contributions are taken into account. It is shown that both are needed for consistent results that respect gauge invariance and crossing properties. The numerical studies reveal the dominance of the twist-3 contribution. With it fair agreement with the recent CLAS measurement of the π0 cross section is obtained. We briefly comment also on wide-angle photoproduction of other pseudoscalar mesons.

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  • Received 26 February 2018

DOI:https://doi.org/10.1103/PhysRevD.97.074023

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Particles & Fields

Authors & Affiliations

P. Kroll

  • Fachbereich Physik, Universität Wuppertal, D-42097 Wuppertal, Germany

K. Passek-Kumerički

  • Theoretical Physics Division, Rudjer Bošković Institute, HR-10002 Zagreb, Croatia

See Also

Wide-angle photo- and electroproduction of pions to twist-3 accuracy

P. Kroll and K. Passek-Kumerički
Phys. Rev. D 104, 054040 (2021)

Article Text

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Issue

Vol. 97, Iss. 7 — 1 April 2018

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