Probing the neutron-skin thickness through $J/ψ$ photoproduction in ultra-peripheral collisions
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arXiv
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| Autori principali: | , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2026
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| _version_ | 1866908984778162176 |
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| author | Li, Haoyuan Liu, Lu-Meng Chen, Jinhui Ma, Yu-Gang Zhang, Chunjian |
| author_facet | Li, Haoyuan Liu, Lu-Meng Chen, Jinhui Ma, Yu-Gang Zhang, Chunjian |
| contents | We study the impact of neutron-skin thickness on $J/ψ$ photoproduction in ultra-peripheral $^{208}\mathrm{Pb}+{}^{208}\mathrm{Pb}$ collisions. Within the Color Glass Condensate framework, we calculate coherent and incoherent cross sections and examine their dependence on the momentum transfer $|t|$ for different neutron-skin thicknesses. We find a clear imprint of the neutron skin on the $|t|$ spectra: a larger neutron skin leads to a smoother and more extended color-density profile, suppressing the coherent cross section at large $|t|$ while enhancing the incoherent cross section through increased event-by-event configurational fluctuations in the nuclear periphery. We further show that the ratio of incoherent to coherent integrated cross sections provides a particularly sensitive and robust observable, with reduced theoretical uncertainties. These results establish diffractive vector-meson photoproduction in ultra-peripheral collisions as a powerful tomographic tool to constrain the neutron-skin thickness and the transverse gluon distribution at the LHC and future Electron-Ion Colliders. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_19650 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Probing the neutron-skin thickness through $J/ψ$ photoproduction in ultra-peripheral collisions Li, Haoyuan Liu, Lu-Meng Chen, Jinhui Ma, Yu-Gang Zhang, Chunjian Nuclear Theory Nuclear Experiment We study the impact of neutron-skin thickness on $J/ψ$ photoproduction in ultra-peripheral $^{208}\mathrm{Pb}+{}^{208}\mathrm{Pb}$ collisions. Within the Color Glass Condensate framework, we calculate coherent and incoherent cross sections and examine their dependence on the momentum transfer $|t|$ for different neutron-skin thicknesses. We find a clear imprint of the neutron skin on the $|t|$ spectra: a larger neutron skin leads to a smoother and more extended color-density profile, suppressing the coherent cross section at large $|t|$ while enhancing the incoherent cross section through increased event-by-event configurational fluctuations in the nuclear periphery. We further show that the ratio of incoherent to coherent integrated cross sections provides a particularly sensitive and robust observable, with reduced theoretical uncertainties. These results establish diffractive vector-meson photoproduction in ultra-peripheral collisions as a powerful tomographic tool to constrain the neutron-skin thickness and the transverse gluon distribution at the LHC and future Electron-Ion Colliders. |
| title | Probing the neutron-skin thickness through $J/ψ$ photoproduction in ultra-peripheral collisions |
| topic | Nuclear Theory Nuclear Experiment |
| url | https://arxiv.org/abs/2604.19650 |