Coherent J/ψ photoproduction at midrapidity in Pb - Pb collisions at root sNN=5.02 TeV

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21340%2F25%3A00389321" target="_blank" >RIV/68407700:21340/25:00389321 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1016/j.physletb.2025.139952" target="_blank" >https://doi.org/10.1016/j.physletb.2025.139952</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.physletb.2025.139952" target="_blank" >10.1016/j.physletb.2025.139952</a>

Result language
angličtina
Original language name
Coherent J/ψ photoproduction at midrapidity in Pb - Pb collisions at root sNN=5.02 TeV
Original language description
The coherent J/psi photoproduction cross section is measured for the first time at midrapidity in peripheral to semicentral Pb - Pb collisions at root s(NN) = 5.02 TeV. The centrality differential cross section d sigma/dy is reported for the centrality range 40-90%, together with the doubly-differential cross section d(2)sigma/dydp(T), extracted in two peripheral centrality classes. The J/psi mesons are reconstructed in the dielectron channel, in the rapidity interval |y| < 0.9 using the ALICE central barrel detectors. The J/psi cross section at midrapidity is statistically compatible to the earlier ALICE measurement at forward rapidity and at the same centre-of-mass energy, and shows only a mild centrality dependence over the covered range. Several sets of theoretical calculations taking into account the hadronic overlap in the collisions but ignoring possible final-state effects from a hot expanding medium are found to give a fairly good description of the current measurements within uncertainties.
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/LM2023040" target="_blank" >LM2023040: Research infrastructure for experiments at CERN</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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