Incoherent J/ψ production at large | t | identifies the onset of saturation at the LHC

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21340%2F24%3A00377126" target="_blank" >RIV/68407700:21340/24:00377126 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1016/j.physletb.2024.138613" target="_blank" >https://doi.org/10.1016/j.physletb.2024.138613</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.physletb.2024.138613" target="_blank" >10.1016/j.physletb.2024.138613</a>

Result language
angličtina
Original language name
Incoherent J/ψ production at large | t | identifies the onset of saturation at the LHC
Original language description
We predict that the onset of gluon saturation can be uniquely identified using incoherent J/g/ production in Pb-Pb collisions at currently accessible energies of the LHC. The diffractive incoherent photo -production of a J/g/ vector meson off a hadron provides information on the partonic structure of the hadron. Within the GoodWalker 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 energydependent 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 J/g/ 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-Pb collisions at the LHC.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10303 - Particles and field physics

Project
<a href="/en/project/GA22-27262S" target="_blank" >GA22-27262S: Signatures of saturation for future electron-ion colliders at a new level of precision</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2024
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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