Exclusive J/[psi] photoproduction off protons in ultraperipheral p-Pb collisions at √sNN=5.02 TeV
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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| Hauptverfasser: | , , , , , , , , , , , , , , , , , , , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
5 December 2014
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| In: |
Physical review letters
Year: 2014, Jahrgang: 113, Heft: 23 |
| ISSN: | 1079-7114 |
| DOI: | 10.1103/PhysRevLett.113.232504 |
| Online-Zugang: | 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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| Verfasserangaben: | B. Abelev et al.* (ALICE Collaboration) |
MARC
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| 245 | 1 | 0 | |a Exclusive J/[psi] photoproduction off protons in ultraperipheral p-Pb collisions at √sNN=5.02 TeV |c B. Abelev et al.* (ALICE Collaboration) |
| 246 | 3 | 0 | |a ψ sqrt |
| 246 | 3 | 3 | |a Exclusive J / [psi] photoproduction off protons in ultraperipheral p-Pb collisions at root s NN = 5.02 TeV |
| 264 | 1 | |c 5 December 2014 | |
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| 500 | |a *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] | ||
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| 500 | |a Im Titel steht der Ausdruck "sNN" unter dem Wurzelsymbol, "NN" ist dabei tiefgestellt | ||
| 500 | |a Im Titel ist der Buchstabe s hochgestellt | ||
| 500 | |a Gesehen am 06.10.2020 | ||
| 520 | |a 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. | ||
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