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Twist-3 generalized parton distributions in deeply-virtual Compton scattering
Aslan, F Burkardt, M Lorcé, C Metz, A Pasquini, B
Aslan, F
Burkardt, M
Lorcé, C
Metz, A
Pasquini, B
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Journal Article
Date
2018-07-01
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10.1103/PhysRevD.98.014038
Abstract
© 2018 authors. Published by the American Physical Society. 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.
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Physical Review D
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