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| Main Authors: | , , , |
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| Format: | Preprint |
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2023
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2312.11320 |
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| _version_ | 1866911815447871488 |
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| author | Cepila, Jan Contreras, Jesus Guillermo Matas, Marek Ridzikova, Alexandra |
| author_facet | Cepila, Jan Contreras, Jesus Guillermo Matas, Marek Ridzikova, Alexandra |
| contents | We predict that the onset of gluon saturation can be uniquely identified using incoherent ${\rm J}/ψ$ production in Pb$\unicode{x2013}$Pb collisions at currently accessible energies of the LHC. The diffractive incoherent photo-production of a ${\rm J}/ψ$ vector meson off a hadron provides information on the partonic structure of the hadron. Within the Good-Walker approach it specifically measures the variance over possible target configurations of the hadronic colour field. For this process then, gluon saturation sets in when the cross section reaches a maximum, as a function of the centre-of-mass energy of the photon-hadron system ($W$), and then decreases. We benchmark the energy-dependent hot-spot model against data from HERA and the LHC and demonstrate a good description of the available data. We show that the study of the energy dependence of the incoherent production of ${\rm J}/ψ$ allows us to pinpoint the onset of saturation effects by selecting the region of Mandelstam-$t$ around 1 GeV$^2$ where the contribution of hot spots is dominant. We predict the onset of saturation in a Pb target to occur for $W$ around a few hundred GeV. This can be measured with current data in ultra-peripheral Pb$\unicode{x2013}$Pb collisions at the LHC. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2312_11320 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Incoherent ${\rm J}/ψ$ production at large $|t|$ identifies the onset of saturation at the LHC Cepila, Jan Contreras, Jesus Guillermo Matas, Marek Ridzikova, Alexandra High Energy Physics - Phenomenology High Energy Physics - Experiment We predict that the onset of gluon saturation can be uniquely identified using incoherent ${\rm J}/ψ$ production in Pb$\unicode{x2013}$Pb collisions at currently accessible energies of the LHC. The diffractive incoherent photo-production of a ${\rm J}/ψ$ vector meson off a hadron provides information on the partonic structure of the hadron. Within the Good-Walker approach it specifically measures the variance over possible target configurations of the hadronic colour field. For this process then, gluon saturation sets in when the cross section reaches a maximum, as a function of the centre-of-mass energy of the photon-hadron system ($W$), and then decreases. We benchmark the energy-dependent hot-spot model against data from HERA and the LHC and demonstrate a good description of the available data. We show that the study of the energy dependence of the incoherent production of ${\rm J}/ψ$ allows us to pinpoint the onset of saturation effects by selecting the region of Mandelstam-$t$ around 1 GeV$^2$ where the contribution of hot spots is dominant. We predict the onset of saturation in a Pb target to occur for $W$ around a few hundred GeV. This can be measured with current data in ultra-peripheral Pb$\unicode{x2013}$Pb collisions at the LHC. |
| title | Incoherent ${\rm J}/ψ$ production at large $|t|$ identifies the onset of saturation at the LHC |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2312.11320 |