Work

Timelike Compton scattering on a spin-0 target with kinematic twist-4 precision

Year: 2025

Type: article

Abstract: We calculate the kinematic twist-3 and twist-4 corrections to the leading-order amplitude of timelike Compton scattering (TCS) on a (pseudo)scalar target, in the recently developed framework based on the conformal operator-product expansion. This allows us to compute the complete set of helicity amplitudes of the process, in particular those that vanish at leading twist. We compare the effects of higher-twist contributions to TCS with those in deeply virtual Compton scattering. Our estimates, based on a π -meson GPD model, indicate that these contributions are sizeable and will play a crucial role in the interpretation of data from current and forthcoming experiments.

Source: Physical review. D/Physical review. D.

DOI: 10.1103/physrevd.111.074034

Authors: V. Martínez-Fernández, B. Pire, P. Sznajder, J. Wagner

Institutions: National Centre for Nuclear Research, Institut de Recherche sur les Lois Fondamentales de l'Univers, Stony Brook University, Centre de Physique Théorique, Centre de Physique Théorique

Language: English

Topic: Quantum Chromodynamics and Particle Interactions

Subfield: Nuclear and High Energy Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: hybrid

Funders: Agence Nationale de la Recherche, Narodowe Centrum Nauki, Universität Regensburg

Awards: G1586112442, Computerised Tomography of Nucleons