Coherent J/psi and psi ' photoproduction at midrapidity in ultra-peripheral Pb-Pb collisions at root s(NN)=5.02 TeV

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F21%3A00545623" target="_blank" >RIV/68378271:_____/21:00545623 - isvavai.cz</a>
Alternative codes found
RIV/61389005:_____/21:00545623 RIV/68407700:21340/21:00352450
Result on the web
<a href="https://doi.org/10.1140/epjc/s10052-021-09437-6" target="_blank" >https://doi.org/10.1140/epjc/s10052-021-09437-6</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1140/epjc/s10052-021-09437-6" target="_blank" >10.1140/epjc/s10052-021-09437-6</a>

Result language
angličtina
Original language name
Coherent J/psi and psi ' photoproduction at midrapidity in ultra-peripheral Pb-Pb collisions at root s(NN)=5.02 TeV
Original language description
The coherent photoproduction of J/psi and psi' mesons was measured in ultra-peripheral Pb-Pb collisions at a center-of-mass energy root s(NN) = 5.02 TeV with the ALICE detector. Charmonia are detected in the central rapidity region for events where the hadronic interactions are strongly suppressed. The J/psi is reconstructed using the dilepton (l(+)l(-)) and proton-antiproton decay channels, while for the psi' the dilepton and the l(+)l(-) pi(+)pi(-) decay channels are studied. The analysis is based on an event sample corresponding to an integrated luminosity of about 233 mu b(-1). The results are compared with theoretical models for coherent J/psi and psi' photoproduction. The coherent cross section is found to be in a good agreement with models incorporating moderate nuclear gluon shadowing of about 0.64 at a Bjorken-x of around 6 x 10(-4), such as the EPS09 parametrization, however none of the models is able to fully describe the rapidity dependence of the coherent J/psi cross section including ALICE measurements at forward rapidity. The ratio of psi' to J/psi coherent photoproduction cross sections was also measured and found to be consistent with the one for photoproduction off protons.
Czech name
—
Czech description
—

Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
—
OECD FORD branch
10303 - Particles and field physics

Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2021
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Similar results(10)