Kroll, Peter; Passek-Kumerički, Kornelija (2021) Wide-angle photo- and electroproduction of pions to twist-3 accuracy. Physical review. D, 104 (5). ISSN 2470-0010
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Abstract
We investigate wide-angle photo- and electroproduction of pions within the handbag mechanism in which the γ^(*) N → π N' amplitudes factorize into hard partonic subprocess amplitudes, γ^(*) q → π q' , and form factors representing 1/x-moments of generalized parton distributions (GPDs). The subprocess is calculated to twist-3 accuracy taking into account the 2- and 3-body Fock components of the pion. Both components are required for achieving gauge invariance in QED and QCD. The twist-2 and twist-3 distribution amplitudes (DAs) of the pion as well as the form factors are taken from our study of π 0 photoproduction. Extensive results on photoproduction of charged pions are presented and compared to experiment. Predictions on electroproduction of pions as well as on spin effects are also given. As a byproduct of our analysis we also obtain the complete twist-3 subprocess amplitudes contributing to deeply virtual electroproduction of pions.
| Item Type: | Article | ||||||||||||
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| Uncontrolled Keywords: | QCD ; exclusive processes ; pion electroproduction ; wide-angle ; higher-twist | ||||||||||||
| Subjects: | NATURAL SCIENCES > Physics | ||||||||||||
| Divisions: | Theoretical Physics Division | ||||||||||||
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| Depositing User: | Kornelija Passek-Kumerički | ||||||||||||
| Date Deposited: | 21 Jul 2022 11:48 | ||||||||||||
| URI: | http://fulir.irb.hr/id/eprint/7489 | ||||||||||||
| DOI: | 10.1103/PhysRevD.104.054040 |
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