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  • Open Access

Accessing baryon-antibaryon generalized distribution amplitudes in e±γ→e±BB¯

Jing Han1, Bernard Pire2, and Qin-Tao Song1,*

  • *Contact author: songqintao@zzu.edu.cn
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Phys. Rev. D 113, 014027 – Published 23 January, 2026

DOI: https://doi.org/10.1103/6zmf-wd76

Abstract

γ*γ→BB¯ is the golden process to access chiral-even di-baryon generalized distribution amplitudes (GDAs) as deeply virtual Compton scattering has proven to be for the generalized parton distributions. In the framework of colinear quantum chromodynamics factorization, where the leading twist amplitude is the convolution of GDAs and a perturbatively calculable coefficient function, we study the scattering amplitude for the baryonic channels where B is a spin 1/2 baryon such as the nucleon or hyperon Λ, Σ. Taking into account the interfering quantum electrodynamics amplitude, we calculate the cross section of the e±γ→e±BB¯ process, which can be experimentally studied in e−e+ as well as in electron-ion facilities. We explore both the final state polarization summed case and the polarization dependent effects. Numerical estimates are presented for e−γ→e−pp¯ using motivated models for GDAs. Our results show that a first extraction of baryon-antibaryon GDAs from experimental measurements is feasible at Belle II.

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Phys. Rev. D 113, 014027– Published 23 January, 2026
  • Received 13 November 2025
  • Accepted 9 January 2026
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

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