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Revealing chiral-odd two-meson generalized distribution amplitudes in e−e+→(ππ)(ππ) reactions

Shohini Bhattacharya1,*, Renaud Boussarie2,†, Bernard Pire2,‡, and Lech Szymanowski3,§

  • *Contact author: shohinib@uconn.edu
  • †Contact author: renaud.boussarie@polytechnique.edu
  • ‡Contact author: bernard.pire@polytechnique.edu
  • §Contact author: lech.szymanowski@ncbj.gov.pl
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Phys. Rev. D 113, 094008 – Published 6 May, 2026

DOI: https://doi.org/10.1103/rl5q-5h2n

Abstract

We demonstrate that chiral-odd dimeson generalized distribution amplitudes (CO-GDAs)—nonperturbative objects encoding the transition of a quark-antiquark pair into two mesons—can be accessed in high-energy e−e+ annihilation into two meson pairs, each with a relatively low invariant mass. While chiral-even GDAs contribute to the leading one-photon amplitude, the chiral-odd sector enters via two-photon exchange. We show that the interference between these amplitudes leads to specific effects which may be measurable at BES III or future tau-charm factories. This work opens a direct path to experimentally probing the long-missing chiral-odd sector of meson structure—specifically, the spin-orbit correlation in a spin-0 meson, in some contexts referred to as anomalous tensorial magnetic moment.

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Phys. Rev. D 113, 094008– Published 6 May, 2026
  • Received 5 August 2025
  • Accepted 9 April 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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