Centrality dependence of J/psi and psi(2S) production and nuclear modification in p-Pb collisions at root s(NN)=8.16 TeV

0540940 - ÚJF 2022 RIV US eng J - Journal Article
Acharya, S. - Adamová, Dagmar - Bielčík, J. - Bielčíková, Jana - Broz, M. - Contreras, J. G. - Herman, T. - Horák, D. - Isakov, Artem - Křížek, Filip - Křížková Gajdošová, K. - Kushpil, Svetlana - Lavička, R. - Mareš, Jiří A. - Petráček, V. - Šafařík, K. - Šumbera, Michal - Torres, S. R. - Trzeciak, B. A. - Závada, Petr … Total 1025 authors
Centrality dependence of J/psi and psi(2S) production and nuclear modification in p-Pb collisions at root s(NN)=8.16 TeV.
Journal of High Energy Physics. Roč. 2021, č. 2 (2021), č. článku 2. ISSN 1029-8479. E-ISSN 1029-8479
R&D Projects: GA MŠMT(CZ) LTT17018
Research Infrastructure: CERN-CZ II - 90104
Institutional support: RVO:68378271 ; RVO:61389005
Keywords : ALICE collaboration * Hadron-Hadron scattering
OECD category: Nuclear physics; 1.3 Physical sciences (FZU-D)
Impact factor: 6.376, year: 2021
Method of publishing: Open access
https://doi.org/10.1007/JHEP02(2021)002

The inclusive production of the J/ and psi (2S) charmonium states is studied as a function of centrality in p-Pb collisions at a centre-of-mass energy per nucleon pair at root s NN = 8.16 TeV at the LHC. The measurement is performed in the dimuon decay channel with the ALICE apparatus in the centre-of-mass rapidity intervals -4.46 < y(cms)< -2.96 (Pb-going direction) and 2.03 < y(cms)< 3.53 (p-going direction), down to zero transverse momentum (p(T)). The J/psi and psi (2S) production cross sections are evaluated as a function of the collision centrality, estimated through the energy deposited in the zero degree calorimeter located in the Pb-going direction. The p(T)-differential J/psi production cross section is measured at backward and forward rapidity for several centrality classes, together with the corresponding average p(T) and pT2 values. The nuclear effects affecting the production of both charmonium states are studied using the nuclear modification factor. In the p-going direction, a suppression of the production of both charmonium states is observed, which seems to increase from peripheral to central collisions. In the Pb-going direction, however, the centrality dependence is different for the two states: the nuclear modification factor of the J/psi increases from below unity in peripheral collisions to above unity in central collisions, while for the psi (2S) it stays below or consistent with unity for all centralities with no significant centrality dependence. The results are compared with measurements in p-Pb collisions at root sNN = 5.02 TeV and no significant dependence on the energy of the collision is observed. Finally, the results are compared with theoretical models implementing various nuclear matter effects.
Permanent Link: http://hdl.handle.net/11104/0318550