Twist-3 generalized parton distributions in deeply-virtual Compton scattering - Archive ouverte HAL
Article Dans Une Revue Physical Review D Année : 2018

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

Fatma Aslan
  • Fonction : Auteur
Matthias Burkardt
  • Fonction : Auteur
Cédric Lorcé
Andreas Metz
  • Fonction : Auteur
Barbara Pasquini
  • Fonction : Auteur

Résumé

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.

Dates et versions

hal-01730041 , version 1 (12-03-2018)

Identifiants

Citer

Fatma Aslan, Matthias Burkardt, Cédric Lorcé, Andreas Metz, Barbara Pasquini. Twist-3 generalized parton distributions in deeply-virtual Compton scattering. Physical Review D, 2018, 98 (1), pp.014038. ⟨10.1103/PhysRevD.98.014038⟩. ⟨hal-01730041⟩
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