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Photoproduction of low-pT J/ψ from peripheral to central Pb–Pb collisions at 5.02 TeV

Abstract
An excess of J/ψ yield at very low transverse momentum (pT < 0.3 GeV/c), originating from coherent photoproduction, is observed in peripheral and semicentral hadronic Pb–Pb collisions at a center-of-mass energy per nucleon pair of √sNN = 5.02 TeV. The measurement is performed with the ALICE detector via the dimuon decay channel at forward rapidity (2.5 < y < 4). The nuclear modification factor at very low pT and the coherent photoproduction cross section are measured as a function of centrality down to the 10% most central collisions. These results extend the previous study at √sNN = 2.76 TeV, confirming the clear excess over hadronic production in the pT range 0 − 0.3 GeV/c and the centrality range 70–90%, and establishing an excess with a significance greater than 5σ also in the 50–70% and 30–50% centrality ranges. The results are compared with earlier measurements at √sNN = 2.76 TeV and with different theoretical predictions aiming at describing how coherent photoproduction occurs in hadronic interactions with nuclear overlap.
Main Author
ALICE Collaboration
Format
Articles Research article
Published
2023
Series
Physics Letters B
Subjects
ydinfysiikka
hiukkasfysiikka
Publication in research information system
https://converis.jyu.fi/converis/portal/detail/Publication/193506331
Publisher
Elsevier
The permanent address of the publication
https://urn.fi/URN:NBN:fi:jyu-202310196222Use this for linking
Review status
Peer reviewed
ISSN
0370-2693
DOI
https://doi.org/10.1016/j.physletb.2022.137467
Language
English
Published in
Physics Letters B
Citation
License
CC BY 4.0Open Access
Funder(s)
Research Council of Finland
Research Council of Finland
European Commission
Funding program(s)
Centre of Excellence, AoF
Centre of Excellence, AoF
RIA Research and Innovation Action, H2020
Huippuyksikkörahoitus, SA
Huippuyksikkörahoitus, SA
RIA Research and Innovation Action, H2020
Research Council of FinlandEuropean Commission
Funded by the European Union. Views and opinions expressed are however those of the author(s) only and do not necessarily reflect those of the European Union or the European Education and Culture Executive Agency (EACEA). Neither the European Union nor EACEA can be held responsible for them.
Copyright© 2022 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). Funded by SCOAP3.

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description An excess of J/ψ yield at very low transverse momentum (pT < 0.3 GeV/c), originating from coherent photoproduction, is observed in peripheral and semicentral hadronic Pb–Pb collisions at a center-of-mass energy per nucleon pair of √sNN = 5.02 TeV. The measurement is performed with the ALICE detector via the dimuon decay channel at forward rapidity (2.5 < y < 4). The nuclear modification factor at very low pT and the coherent photoproduction cross section are measured as a function of centrality down to the 10% most central collisions. These results extend the previous study at √sNN = 2.76 TeV, confirming the clear excess over hadronic production in the pT range 0 − 0.3 GeV/c and the centrality range 70–90%, and establishing an excess with a significance greater than 5σ also in the 50–70% and 30–50% centrality ranges. The results are compared with earlier measurements at √sNN = 2.76 TeV and with different theoretical predictions aiming at describing how coherent photoproduction occurs in hadronic interactions with nuclear overlap.
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title Photoproduction of low-pT J/ψ from peripheral to central Pb–Pb collisions at 5.02 TeV
title_full Photoproduction of low-pT J/ψ from peripheral to central Pb–Pb collisions at 5.02 TeV
title_fullStr Photoproduction of low-pT J/ψ from peripheral to central Pb–Pb collisions at 5.02 TeV
title_full_unstemmed Photoproduction of low-pT J/ψ from peripheral to central Pb–Pb collisions at 5.02 TeV
title_short Photoproduction of low-pT J/ψ from peripheral to central Pb–Pb collisions at 5.02 TeV
title_sort Photoproduction of lowpT Jψ from peripheral to central Pb–Pb collisions at 502 TeV
topic ydinfysiikka hiukkasfysiikka
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