Exclusive leptoproduction of a light vector meson at the twist-3 in a GTMD framework
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866916566278340608 |
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| author | Boussarie, Renaud Fucilla, Michael Szymanowski, Lech Wallon, Samuel |
| author_facet | Boussarie, Renaud Fucilla, Michael Szymanowski, Lech Wallon, Samuel |
| contents | We provide the most general description of the exclusive leptoproduction of a light vector meson, at high center-of-mass energy, within the CGC/shockwave formalism. We keep a twist-3 accuracy in $s$ channel, thus being able to describe all possible helicity amplitudes, including the ones for the production of a transversally polarized meson. In this latter case, we overcome the well-known issue of endpoint singularities by promoting the GPD to a GTMD given by matrix elements of dipole and double dipole operators. The all-twists treatment of the proton (nucleon) target allow to safely twist-expand the general vacuum-to-meson matrix elements. Therefore, unlike previous attempts in the modified perturbative approach, our final results are expressed in terms of the twist-3 collinear distribution amplitudes, introduced in the context of the higher-twist collinear formalism. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_08143 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Exclusive leptoproduction of a light vector meson at the twist-3 in a GTMD framework Boussarie, Renaud Fucilla, Michael Szymanowski, Lech Wallon, Samuel High Energy Physics - Phenomenology High Energy Physics - Experiment We provide the most general description of the exclusive leptoproduction of a light vector meson, at high center-of-mass energy, within the CGC/shockwave formalism. We keep a twist-3 accuracy in $s$ channel, thus being able to describe all possible helicity amplitudes, including the ones for the production of a transversally polarized meson. In this latter case, we overcome the well-known issue of endpoint singularities by promoting the GPD to a GTMD given by matrix elements of dipole and double dipole operators. The all-twists treatment of the proton (nucleon) target allow to safely twist-expand the general vacuum-to-meson matrix elements. Therefore, unlike previous attempts in the modified perturbative approach, our final results are expressed in terms of the twist-3 collinear distribution amplitudes, introduced in the context of the higher-twist collinear formalism. |
| title | Exclusive leptoproduction of a light vector meson at the twist-3 in a GTMD framework |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2501.08143 |