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Photoproduction of low-pT J/[psi] from peripheral to central Pb-Pb collisions at 5.02 TeV

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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 v...

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Main Authors: Acharya, Shreyasi (Author) , Angelov, Venelin (Author) , Berdnikova, Anastasia (Author) , Bergmann, Luisa (Author) , Danisch, Meike (Author) , Feuillard, Victor (Author) , Fokin, Ilya D. (Author) , Glässel, Peter (Author) , Kim, Jiyoung (Author) , Kim, Minjung (Author) , Kroesen, Martin (Author) , Nath, Abhishek (Author) , Pachmayer, Yvonne C. (Author) , Reygers, Klaus (Author) , Schicker, Rainer (Author) , Schmah, Alexander (Author) , Skorodumovs, Georgijs (Author) , Stachel, Johanna (Author) , Stiefelmaier, Stephan (Author) , Veen, Casper Arie van (Author) , Völkl, Martin (Author) , Windelband, Bernd (Author) , Yüncü, Alperen (Author) , Zanone, Federica (Author)
Corporate Author: ALICE (Author)
Format: Article (Journal)
Language:English
Published: 10 November 2023
In: Physics letters
Year: 2023, Volume: 846, Pages: 1-14
ISSN:1873-2445
DOI:10.1016/j.physletb.2022.137467
Online Access:Verlag, kostenfrei, Volltext: https://doi.org/10.1016/j.physletb.2022.137467
Verlag, kostenfrei, Volltext: https://www.sciencedirect.com/science/article/pii/S0370269322006013
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Author Notes:ALICE collaboration*
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Summary: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.
Item Description:Online verfügbar: 17. September 2023, Artikelversion: 3. Oktober 2023
Im Titel ist der Buchstabe "T" tiefgestellt
*ALICE collaboration: S. Acharya, V. Anguelov, A. Berdnikova, L. Bergmann, M.C. Danisch, V.J.G. Feuillard, I. Fokin, P. Glässel, J. Kim, M. Kim, M. Kroesen, A. Nath, Y. Pachmayer, K. Reygers, R. Schicker, A. Schmah, G. Skorodumovs, J. Stachel, S.F. Stiefelmaier, C.A. Van Veen, M. Völkl, B. Windelbrand, A. Yuncu, F. Zanone [und 1009 weitere Personen]
Gesehen am 04.07.2025
Physical Description:Online Resource
ISSN:1873-2445
DOI:10.1016/j.physletb.2022.137467

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