| Thème(s) : |
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| Titre : |
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Coherent J/Psi photoproduction in ultra-peripheral Pb-Pb collisions at \sqrt{s_NN} = 2.76 TeV |
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| Auteur : |
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B. Abelev, N. Arbor1, G. Conesa Balbastre1, J. Faivre, C. Furget1, R. Guernane1, S. Kox1, J.S. Real1, C. Silvestre1, R. Vernet2, I. Belikov3, B. Hippolyte3, C. Kuhn3, L. Molnar3, C. Roy3, X. Sanchez Castro3, S. Senyukov3, R. Wan3, L. Aphecetche4, G. Batigne4, E. Bergognon4, M. Bregant4, H. Delagrange4, O. Driga4, B. Erazmus4, M. Estienne4, M. Germain4, A. Lardeux4, G. Martinez Garcia4, A. Mas4, L. Massacrier4, A. Matyja4, P. Pillot4, Y. Schutz4, A. Shabetai4, D. Stocco4, c. Cheshkov5, B. Cheynis5, L. Ducroux5, J.-Y. Grossiord5, M. Guilbaud5, R. Tieulent5, A. Uras5, Y. Zoccarato5, S.U. Ahn6, Y.W. Baek6, V. Barret6, N. Bastid6, P. Crochet6, P. Dupieux6, R. Ichou6, X. Lopez6, F. Manso6, M. Marchisone6, S. Porteboeuf-Houssais6, P. Rosnet6, B. Vulpescu6, X. Zhang6 |
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| Laboratoire : |
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| Résumé : |
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The ALICE collaboration has made the first measurement at the LHC of J/Psi photoproduction in ultra-peripheral Pb-Pb-collisions at \sqrt{s_NN} = 2.76 TeV. The J/Psi is identified via its dimuon decay in the forward rapidity region with the muon spectrometer for events where the hadronic activity is required to be minimal. The analysis is based on an event sample corresponding to an integrated luminosity of about 55 mub-1. The cross section for coherent J/Psi production in the rapidity interval -3.6 < y < -2.6 is measured to be dsigma/dy = 1.00 +/- 0.18 (stat) +0.24/-0.26 (syst) mb. The result is compared to theoretical models for coherent J/Psi production and found to be in good agreement with models which include nuclear gluon shadowing. |
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| Collaboration/Projet : |
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ALICE |
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| Type de publication : |
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Articles dans des revues avec comité de lecture |
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Date de publication ou d'écriture : |
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2013 |
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| Nom du périodique : |
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| Physics Letters B (Phys. Lett. B) |
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Elsevier |
| ISSN |
0370-2693 |
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| Volume : |
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718 |
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| Page/Article : |
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1273-1283 |
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| Identifiant local : |
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LPSC12266 |
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| Commentaire : |
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See paper for full list of authors |
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