Revealing chiral-odd two-meson generalized distribution amplitudes in $e^- e^+ \to (ππ) (ππ)$ reactions
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| Main Authors: | , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866917480166850560 |
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| author | Bhattacharya, Shohini Boussarie, Renaud Pire, Bernard Szymanowski, Lech |
| author_facet | Bhattacharya, Shohini Boussarie, Renaud Pire, Bernard Szymanowski, Lech |
| contents | 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-zero meson, in some contexts referred to as anomalous tensorial magnetic moment. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_23529 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Revealing chiral-odd two-meson generalized distribution amplitudes in $e^- e^+ \to (ππ) (ππ)$ reactions Bhattacharya, Shohini Boussarie, Renaud Pire, Bernard Szymanowski, Lech High Energy Physics - Phenomenology High Energy Physics - Experiment High Energy Physics - Lattice 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-zero meson, in some contexts referred to as anomalous tensorial magnetic moment. |
| title | Revealing chiral-odd two-meson generalized distribution amplitudes in $e^- e^+ \to (ππ) (ππ)$ reactions |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment High Energy Physics - Lattice |
| url | https://arxiv.org/abs/2507.23529 |