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Coherent J/Ψ and ψ' photoproduction at midrapidity in ultra-peripheral Pb-Pb  collisions at √sNN=5.02 TeV

The coherent photoproduction of J/Ψ and ψ' mesons was measured in ultra-peripheral Pb-Pb collisions at a center-of-mass energy √sNN = 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...

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Main Authors: Acharya, Shreyasi (Author) , Angelov, Venelin (Author) , Arslandok, Mesut (Author) , Berdnikova, Anastasia (Author) , Bergmann, Luisa (Author) , Danisch, Meike (Author) , Feuillard, Victor (Author) , Glässel, Peter (Author) , Kim, Jiyoung (Author) , Kim, Minjung (Author) , Kroesen, Martin (Author) , López, Jorge (Author) , Martin, Nicole Alice (Author) , Pachmayer, Yvonne C. (Author) , Reygers, Klaus (Author) , Schicker, Rainer (Author) , Schmah, Alexander (Author) , Schmidt, Marten Ole (Author) , Skorodumovs, Georgijs (Author) , Stachel, Johanna (Author) , Stiefelmaier, Stephan (Author) , Windelband, Bernd (Author) , Yüncü, Alperen (Author)
Corporate Author: ALICE (Author)
Format: Article (Journal)
Language:English
Published: 9 August 2021
In: The European physical journal. C, Particles and fields
Year: 2021, Volume: 81, Issue: 8, Pages: 1-21
ISSN:1434-6052
DOI:10.1140/epjc/s10052-021-09437-6
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1140/epjc/s10052-021-09437-6
Verlag, lizenzpflichtig, Volltext: https://link.springer.com/article/10.1140%2Fepjc%2Fs10052-021-09437-6
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Author Notes:ALICE Collaboration*
Description
Summary:The coherent photoproduction of J/Ψ and ψ' mesons was measured in ultra-peripheral Pb-Pb collisions at a center-of-mass energy √sNN = 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/Ψ is reconstructed using the dilepton (l+l-) and proton-antiproton decay channels, while for the ψ' the dilepton and the l+l- π+π- decay channels are studied. The analysis is based on an event sample corresponding to an integrated luminosity of about 233 μb-1. The results are compared with theoretical models for coherent of J/Ψ and ψ' 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 6x10−4, such as the EPS09 parametrization, however none of the models is able to fully describe the rapidity dependence of the coherent J/Ψ cross section including ALICE measurements at forward rapidity. The ratio of ψ' to J/Ψ coherent photoproduction cross sections was also measured and found to be consistent with the one for photoproduction off protons.
Item Description:ALICE Collaboration: S. Acharya, V. Anguelov, M. Arslandok, A. Berdnikova, L. Bergmann, M.C. Danisch, V.J.G. Feuillard, P. Glässel, J. Kim, M. Kim, M. Kroesen, J.A. Lopez, N.A. Martin, Y. Pachmayer, K. Reygers, R. Schicker, A. Schmah, M.O. Schmidt, G. Skorodumovs, J. Stachel, S.F. Stiefelmaier, B. Windelband, A. Yuncu [und viele weitere]
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Im Titel ist "NN" nach s tiefgestellt, der ganze Ausdruck "s NN" steht unter dem Wurzelsymbol
Physical Description:Online Resource
ISSN:1434-6052
DOI:10.1140/epjc/s10052-021-09437-6

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