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Exclusive J/[psi] photoproduction off protons in ultraperipheral p-Pb collisions at √sNN=5.02  TeV

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We present the first measurement at the LHC of exclusive J/ψ photoproduction off protons, in ultraperipheral proton-lead collisions at √sNN=5.02 TeV. Events are selected with a dimuon pair produced either in the rapidity interval, in the laboratory frame, 2.5<y<4 (p−Pb) or −3.6<y<−2.6 (P...

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Main Authors: Abelev, Betty (Author) , Angelov, Venelin (Author) , Busch, Oliver (Author) , Glässel, Peter (Author) , Klein, Jochen (Author) , Leardini, Lucia (Author) , Lohner, Daniel (Author) , Lu, Xianguo (Author) , Maire, Antonin (Author) , Mercado Pérez, Jorge (Author) , Oyama, Ken (Author) , Pachmayer, Yvonne C. (Author) , Reidt, Felix (Author) , Reygers, Klaus (Author) , Schicker, Rainer (Author) , Stachel, Johanna (Author) , Stiller, Johannes Hendrik (Author) , Vallero, Sara (Author) , Völkl, Martin (Author) , Wilkinson, Jeremy (Author) , Windelband, Bernd (Author) , Winn, Michael (Author) , Zimmermann, Alice (Author)
Corporate Author: ALICE (Author)
Format: Article (Journal)
Language:English
Published: 5 December 2014
In: Physical review letters
Year: 2014, Volume: 113, Issue: 23
ISSN:1079-7114
DOI:10.1103/PhysRevLett.113.232504
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1103/PhysRevLett.113.232504
Verlag, lizenzpflichtig, Volltext: https://link.aps.org/doi/10.1103/PhysRevLett.113.232504
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Author Notes:B. Abelev et al.* (ALICE Collaboration)
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Summary:We present the first measurement at the LHC of exclusive J/ψ photoproduction off protons, in ultraperipheral proton-lead collisions at √sNN=5.02 TeV. Events are selected with a dimuon pair produced either in the rapidity interval, in the laboratory frame, 2.5<y<4 (p−Pb) or −3.6<y<−2.6 (Pb−p), and no other particles observed in the ALICE acceptance. The measured cross sections σ(γ+p→J/ψ+p) are 33.2±2.2(stat)±3.2(syst)±0.7(theor) nb in p−Pb and 284±36(stat)+27−32(syst)±26(theor) nb in Pb−p collisions. We measure this process up to about 700 GeV in the γp center of mass, which is a factor of two larger than the highest energy studied at HERA. The data are consistent with a power law dependence of the J/ψ photoproduction cross section in γp energies from about 20 to 700 GeV, or equivalently, from Bjorken x scaling variable between ∼2×10−2 and ∼2×10−5, thus indicating no significant change in the gluon density behavior of the proton between HERA and LHC energies.
Item Description:*ALICE Collaboration: B. Abelev, V. Anguelov, O. Busch, P. Glässel, J. Klein, L. Leardini, D. Lohner, X.-G. Lu, A. Maire, J. Mercado Pérez, K. Oyama, Y. Pachmayer, F. Reidt, K. Reygers, R. Schicker, J. Stachel, J. Stiller, S. Vallero, M. Völkl, J. Wilkinson, B. Windelband, M. Winn, A. Zimmermann [und 927 weitere Personen]
Im Titel ist "psi" als griechischer Buchstabe dargestellt
Im Titel steht der Ausdruck "sNN" unter dem Wurzelsymbol, "NN" ist dabei tiefgestellt
Im Titel ist der Buchstabe s hochgestellt
Gesehen am 06.10.2020
Physical Description:Online Resource
ISSN:1079-7114
DOI:10.1103/PhysRevLett.113.232504

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