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Title: Twist-3 generalized parton distributions in deeply-virtual Compton scattering

Abstract

The subleading power of the scattering amplitude for deeply-virtual Compton scattering (DVCS) off the nucleon contains leading-twist and twist-3 generalized parton distributions (GPDs). We point out that in DVCS, at twist-3 accuracy, one cannot address any individual twist-3 GPD. This complication appears on top of the deconvolution issues familiar from the twist-2 DVCS amplitude. Accessible are exclusively linear combinations involving both vector and axial-vector twist-3 GPDs. This implies, in particular, that the (kinetic) orbital angular momentum of quarks can hardly be constrained by twist-3 DVCS observables. Moreover, using the quark-target model, we find that twist-3 GPDs can be discontinuous. The discontinuities however cancel in the DVCS amplitude, which further supports the hypothesis of factorization at twist-3 accuracy.

Authors:
; ; ; ;
Publication Date:
Research Org.:
New Mexico State Univ., Las Cruces, NM (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1461721
Alternate Identifier(s):
OSTI ID: 1498909
Grant/Contract Number:  
FG03-95ER40965; FG02-96ER40965
Resource Type:
Published Article
Journal Name:
Physical Review D
Additional Journal Information:
Journal Name: Physical Review D Journal Volume: 98 Journal Issue: 1; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Aslan, Fatma, Burkardt, Matthias, Lorcé, Cédric, Metz, Andreas, and Pasquini, Barbara. Twist-3 generalized parton distributions in deeply-virtual Compton scattering. United States: N. p., 2018. Web. doi:10.1103/PhysRevD.98.014038.
Aslan, Fatma, Burkardt, Matthias, Lorcé, Cédric, Metz, Andreas, & Pasquini, Barbara. Twist-3 generalized parton distributions in deeply-virtual Compton scattering. United States. doi:10.1103/PhysRevD.98.014038.
Aslan, Fatma, Burkardt, Matthias, Lorcé, Cédric, Metz, Andreas, and Pasquini, Barbara. Thu . "Twist-3 generalized parton distributions in deeply-virtual Compton scattering". United States. doi:10.1103/PhysRevD.98.014038.
@article{osti_1461721,
title = {Twist-3 generalized parton distributions in deeply-virtual Compton scattering},
author = {Aslan, Fatma and Burkardt, Matthias and Lorcé, Cédric and Metz, Andreas and Pasquini, Barbara},
abstractNote = {The subleading power of the scattering amplitude for deeply-virtual Compton scattering (DVCS) off the nucleon contains leading-twist and twist-3 generalized parton distributions (GPDs). We point out that in DVCS, at twist-3 accuracy, one cannot address any individual twist-3 GPD. This complication appears on top of the deconvolution issues familiar from the twist-2 DVCS amplitude. Accessible are exclusively linear combinations involving both vector and axial-vector twist-3 GPDs. This implies, in particular, that the (kinetic) orbital angular momentum of quarks can hardly be constrained by twist-3 DVCS observables. Moreover, using the quark-target model, we find that twist-3 GPDs can be discontinuous. The discontinuities however cancel in the DVCS amplitude, which further supports the hypothesis of factorization at twist-3 accuracy.},
doi = {10.1103/PhysRevD.98.014038},
journal = {Physical Review D},
number = 1,
volume = 98,
place = {United States},
year = {2018},
month = {7}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1103/PhysRevD.98.014038

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Cited by: 2 works
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