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Title: | Coherent J/ψ photoproduction in ultra-peripheral PbPb collisions at s<inf>NN</inf>=2.76TeV with the CMS experiment |
Authors: | Khachatryan, V Sirunyan, AM Tumasyan, A Adam, W Asilar, E Bergauer, T Brandstetter, J Brondolin, E Dragicevic, M Erö, J Flechl, M Friedl, M Frühwirth, R Ghete, VM Hartl, C Hörmann, N Hrubec, J Jeitler, M König, A Krammer, M Krätschmer, I Liko, D Matsushita, T Mikulec, I Rabady, D Rad, N Rahbaran, B Rohringer, H Schieck, J Schöfbeck, R Strauss, J Treberer-Treberspurg, W Waltenberger, W Wulz, CE Mossolov, V Shumeiko, N Suarez Gonzalez, J Alderweireldt, S Cornelis, T De Wolf, EA Janssen, X Knutsson, A Lauwers, J Luyckx, S Van De Klundert, M Van Haevermaet, H Van Mechelen, P Van Remortel, N Van Spilbeeck, A Abu Zeid, S Blekman, F D'Hondt, J Daci, N De Bruyn, I Deroover, K Heracleous, N Keaveney, J Lowette, S Moortgat, S Moreels, L Olbrechts, A Python, Q Strom, D Tavernier, S Van Doninck, W Van Mulders, P Van Onsem, GP Van Parijs, I Brun, H Caillol, C Clerbaux, B De Lentdecker, G Fasanella, G Favart, L Goldouzian, R Grebenyuk, A Karapostoli, G Lenzi, T Léonard, A Maerschalk, T Marinov, A Perniè, L Randle-conde, A Seva, T Vander Velde, C Vanlaer, P Yonamine, R Zenoni, F Zhang, F Benucci, L Cimmino, A Crucy, S Dobur, D Fagot, A Garcia, G Gul, M Mccartin, J Ocampo Rios, AA |
Citation: | Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 2017, 772 pp. 489 - 511 |
Abstract: | © 2017 The Author(s) The cross section for coherent J/ψ photoproduction accompanied by at least one neutron on one side of the interaction point and no neutron activity on the other side, X n 0 n , is measured with the CMS experiment in ultra-peripheral PbPb collisions at s NN =2.76TeV. The analysis is based on a data sample corresponding to an integrated luminosity of 159μb −1 , collected during the 2011 PbPb run. The J/ψ mesons are reconstructed in the dimuon decay channel, while neutrons are detected using zero degree calorimeters. The measured cross section is dσ X n 0 n coh /dy(J/ψ)=0.36±0.04(stat)±0.04(syst) mb in the rapidity interval 1.8 < |y| < 2.3. Using a model for the relative rate of coherent photoproduction processes, this X n 0 n measurement gives a total coherent photoproduction cross section of dσ coh /dy(J/ψ)=1.82±0.22(stat)±0.20(syst)±0.19(theo) mb. The data strongly disfavor the impulse approximation model prediction, indicating that nuclear effects are needed to describe coherent J/ψ photoproduction in γ+Pb interactions. The data are found to be consistent with the leading twist approximation, which includes nuclear gluon shadowing. |
URI: | http://bura.brunel.ac.uk/handle/2438/15411 |
DOI: | http://dx.doi.org/10.1016/j.physletb.2017.07.001 |
ISSN: | 0370-2693 |
Appears in Collections: | Publications |
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