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

被引：21
作者：
Aslan, Fatma [1 ]
Burkardt, Matthias [1 ]
Lorce, Cedric [2 ]
Metz, Andreas [3 ]
Pasquini, Barbara [4 ,5 ]
机构：
[1] New Mexico State Univ, Dept Phys, Las Cruces, NM 88003 USA
[2] Univ Paris Saclay, CNRS, Ctr Phys Theor, Ecole Polytech, F-91128 Palaiseau, France
[3] Temple Univ, Dept Phys, SERC, Philadelphia, PA 19122 USA
[4] Univ Pavia, Dipartimento Fis, I-27100 Pavia, Italy
[5] Ist Nazl Fis Nucl, Sez Pavia, I-27100 Pavia, Italy
来源：
PHYSICAL REVIEW D | 2018年 / 98卷 / 01期
基金：
欧洲研究理事会; 美国国家科学基金会;
关键词：
WANDZURA-WILCZEK APPROXIMATION; SUM-RULES; DVCS; AMPLITUDE; NUCLEON; SPIN; VIOLATION;
D O I：
10.1103/PhysRevD.98.014038
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
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-3GPDs. This implies, in particular, that the (kinetic) orbital angular momentumof quarks can hardly be constrained by twist-3DVCS observables. Moreover, using the quark-target model, we find that twist-3GPDs can be discontinuous. The discontinuities however cancel in the DVCS amplitude, which further supports the hypothesis of factorization at twist-3 accuracy.
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页数：14
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