First study of the initial gluonic fluctuations using UPCs with ALICE
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arXiv
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866911763525533696 |
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| author | Matyja, Adam Tomasz |
| author_facet | Matyja, Adam Tomasz |
| contents | Incoherent and dissociative J/$ψ$ photoproduction is sensitive to fluctuations of the gluonic structure of the target. Thus, the measurement of J/$ψ$ photoproduction of the colliding hadron sheds light on the initial state of QCD and provides important constraints on the initial conditions used in hydrodynamical models of heavy-ion collisions. The first measurement of the transverse momentum dependence of both coherent and incoherent J/$ψ$ photoproduction in ultraperipheral Pb-Pb collisions at midrapidity is presented. These new results provide, for the first time, a clear indication of subnucleonic fluctuations of the lead target. We also present the new measurement of dissociative J/$ψ$ photoproduction cross section as a function of energy, in p-Pb collisions at forward rapidity. Dissociative results do not show any indication of saturation and agree with previous data. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2401_13340 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | First study of the initial gluonic fluctuations using UPCs with ALICE Matyja, Adam Tomasz Nuclear Experiment Incoherent and dissociative J/$ψ$ photoproduction is sensitive to fluctuations of the gluonic structure of the target. Thus, the measurement of J/$ψ$ photoproduction of the colliding hadron sheds light on the initial state of QCD and provides important constraints on the initial conditions used in hydrodynamical models of heavy-ion collisions. The first measurement of the transverse momentum dependence of both coherent and incoherent J/$ψ$ photoproduction in ultraperipheral Pb-Pb collisions at midrapidity is presented. These new results provide, for the first time, a clear indication of subnucleonic fluctuations of the lead target. We also present the new measurement of dissociative J/$ψ$ photoproduction cross section as a function of energy, in p-Pb collisions at forward rapidity. Dissociative results do not show any indication of saturation and agree with previous data. |
| title | First study of the initial gluonic fluctuations using UPCs with ALICE |
| topic | Nuclear Experiment |
| url | https://arxiv.org/abs/2401.13340 |