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Dispersion relations of deeply virtual Compton scattering: Investigating twist-four kinematic power corrections

Víctor Martínez-Fernández1,2,* and Cédric Mezrag1,†

  • *Contact author: victor.martinezfernandez@cea.fr
  • †Contact author: cedric.mezrag@cea.fr
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Phys. Rev. D 113, 094004 – Published 4 May, 2026

DOI: https://doi.org/10.1103/6kny-88yg

Abstract

In this paper we include kinematic power corrections up to twist-four to the deeply virtual Compton scattering dispersion relation. We demonstrate that, both for (pseudo)scalar and spin-1/2 targets, the formal expression of the n-subtracted leading-twist dispersion relations is preserved. However, the expression of the subtracted constants is modified by the kinematic powers. Importantly, the minimal-subtracted dispersion relation for the helicity-conserving amplitude, previously thought to depend only on the Polyakov-Weiss D-term, now also depends on the double distributions F and K. These results are consistent with the ones obtained previously in the literature. Such a mixing may be critical for the Jefferson Lab kinematic range, as it is not suppressed for typical values of t and Q2 in the valence region. We therefore expect a strong impact on the attempts to extract pressure forces from deeply virtual Compton scattering data.

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Physics Subject Headings (PhySH)

See Also

Constraining the energy-momentum tensor through the DVCS dispersion relation beyond leading power

Víctor Martínez-Fernández, Daniele Binosi, Cédric Mezrag, and Zhao-Qian Yao (姚照千)
Phys. Rev. D 113, 094003 (2026)

Article Text

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Phys. Rev. D 113, 094004– Published 4 May, 2026
  • Received 18 September 2025
  • Accepted 26 February 2026
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