Near-threshold heavy quarkonium photoproduction in a light-front spectator model
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arXiv
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| Format: | Preprint |
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2026
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| author | Sain, Amrita Gurjar, Bheemsehan Mondal, Chandan |
| author_facet | Sain, Amrita Gurjar, Bheemsehan Mondal, Chandan |
| contents | The near-threshold photo- and electroproduction of heavy vector quarkonia off the proton provides direct access to its gluonic structure. In particular, the cross section for $J/Ψ$ photoproduction near threshold is governed by the proton's gluon gravitational form factors (GFFs). In this work, we employ the generalized parton distribution framework together with gluon GFFs calculated in a light-front gluon-spectator model inspired by soft-wall AdS/QCD to predict both the differential and total cross sections for near-threshold $J/Ψ$ and $Υ$ photoproductions. Our results for $J/Ψ$ photoproduction show good agreement with recent experimental data from the $J/Ψ$-007 and GlueX Collaborations at Jefferson Lab, as well as with earlier measurements from SLAC and Cornell. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2601_05840 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Near-threshold heavy quarkonium photoproduction in a light-front spectator model Sain, Amrita Gurjar, Bheemsehan Mondal, Chandan High Energy Physics - Phenomenology High Energy Physics - Experiment High Energy Physics - Lattice High Energy Physics - Theory Nuclear Theory The near-threshold photo- and electroproduction of heavy vector quarkonia off the proton provides direct access to its gluonic structure. In particular, the cross section for $J/Ψ$ photoproduction near threshold is governed by the proton's gluon gravitational form factors (GFFs). In this work, we employ the generalized parton distribution framework together with gluon GFFs calculated in a light-front gluon-spectator model inspired by soft-wall AdS/QCD to predict both the differential and total cross sections for near-threshold $J/Ψ$ and $Υ$ photoproductions. Our results for $J/Ψ$ photoproduction show good agreement with recent experimental data from the $J/Ψ$-007 and GlueX Collaborations at Jefferson Lab, as well as with earlier measurements from SLAC and Cornell. |
| title | Near-threshold heavy quarkonium photoproduction in a light-front spectator model |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment High Energy Physics - Lattice High Energy Physics - Theory Nuclear Theory |
| url | https://arxiv.org/abs/2601.05840 |