Investigating subnucleonic structures via new measurements of incoherent J/$ψ$ photoproduction in ultra-peripheral Pb--Pb collisions with ALICE
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866909841169055744 |
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| author | Humlová, Vendulka |
| author_facet | Humlová, Vendulka |
| contents | Ultra-peripheral collisions of heavy ions provide a unique environment to study the gluon structure of nuclei through photon-induced reactions. In particular, the incoherent photoproduction of J/$ψ$ vector meson is sensitive to event-by-event fluctuations of the gluon field at nucleon and subnucleonic scales. We report new ALICE measurement of incoherent J/$ψ$ production in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV, differential in both photon-nucleus energy and Mandelstam-$|t|$. At low $|t|$, the cross section rises with increasing photon-nucleus energy, while at larger $|t|$ the growth is suppressed with respect to the trend at low $|t|$. This measurement represents the first study of incoherent photoproduction at the LHC performed as a function of both $W_{γ\mathrm{Pb},n}$ and $|t|$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_11120 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Investigating subnucleonic structures via new measurements of incoherent J/$ψ$ photoproduction in ultra-peripheral Pb--Pb collisions with ALICE Humlová, Vendulka Nuclear Experiment High Energy Physics - Experiment Ultra-peripheral collisions of heavy ions provide a unique environment to study the gluon structure of nuclei through photon-induced reactions. In particular, the incoherent photoproduction of J/$ψ$ vector meson is sensitive to event-by-event fluctuations of the gluon field at nucleon and subnucleonic scales. We report new ALICE measurement of incoherent J/$ψ$ production in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV, differential in both photon-nucleus energy and Mandelstam-$|t|$. At low $|t|$, the cross section rises with increasing photon-nucleus energy, while at larger $|t|$ the growth is suppressed with respect to the trend at low $|t|$. This measurement represents the first study of incoherent photoproduction at the LHC performed as a function of both $W_{γ\mathrm{Pb},n}$ and $|t|$. |
| title | Investigating subnucleonic structures via new measurements of incoherent J/$ψ$ photoproduction in ultra-peripheral Pb--Pb collisions with ALICE |
| topic | Nuclear Experiment High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2510.11120 |