Coherent $J/ψ$ photoproduction and polarization in peripheral Pb$-$Pb collisions
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arXiv
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866911780047945728 |
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| author | Shatat, Afnan |
| author_facet | Shatat, Afnan |
| contents | Photonuclear reactions are induced by the strong electromagnetic field generated by ultrarelativistic heavy-ion collisions. These processes have been extensively studied in ultraperipheral collisions, where the impact parameter is larger than twice the nuclear radius. In recent years, the observation of coherent $J/ψ$ photoproduction at very low transverse momentum has been claimed in nucleus$-$nucleus (A$-$A) collisions with nuclear overlap, based on the measurement of an excess in the $J/ψ$ yield with respect to hadroproduction expectations. Such quarkonium measurements can help to constrain the nuclear gluon distribution at low Bjorken-$x$ and high energy. The photoproduced quarkonium is expected to preserve the polarization of the incoming photon due to the $s$-channel helicity conservation. In this contribution, we report on the new preliminary measurements of the $y$-differential cross section and the first polarization analysis of coherently photoproduced $J/ψ$ in peripheral Pb$-$Pb collisions with the ALICE detector at forward rapidity in the dimuon decay channel. Comparison with models will be shown when available. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2402_12469 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Coherent $J/ψ$ photoproduction and polarization in peripheral Pb$-$Pb collisions Shatat, Afnan Nuclear Experiment High Energy Physics - Experiment Photonuclear reactions are induced by the strong electromagnetic field generated by ultrarelativistic heavy-ion collisions. These processes have been extensively studied in ultraperipheral collisions, where the impact parameter is larger than twice the nuclear radius. In recent years, the observation of coherent $J/ψ$ photoproduction at very low transverse momentum has been claimed in nucleus$-$nucleus (A$-$A) collisions with nuclear overlap, based on the measurement of an excess in the $J/ψ$ yield with respect to hadroproduction expectations. Such quarkonium measurements can help to constrain the nuclear gluon distribution at low Bjorken-$x$ and high energy. The photoproduced quarkonium is expected to preserve the polarization of the incoming photon due to the $s$-channel helicity conservation. In this contribution, we report on the new preliminary measurements of the $y$-differential cross section and the first polarization analysis of coherently photoproduced $J/ψ$ in peripheral Pb$-$Pb collisions with the ALICE detector at forward rapidity in the dimuon decay channel. Comparison with models will be shown when available. |
| title | Coherent $J/ψ$ photoproduction and polarization in peripheral Pb$-$Pb collisions |
| topic | Nuclear Experiment High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2402.12469 |