Observation of sequential Υ suppression in PbPb collisions

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题名:	Observation of sequential Υ suppression in PbPb collisions
作者:	余欣珊;Chatrchyan, S.;Roland, B.;Blyweert, S.;Clerbaux, B.;Carvalho, W.;Ban, Y.;Guo, S.;Qian, S. J.;Teng, H.;Besancon, M.;Fabbro, B.;Ferri, F.;Beaudette, F.;Mirabito, L.;Sordini, V.;Erdmann, M.;Steggemann, J.;Gunnellini, P.;Wissing, C.;Draeger, J.;Erfle, J.;De Boer, W.;Katkov, I.;Quast, G.;Manolakos, I.;Markou, C.;Mehta, M. Z.;Naimuddin, M.;Sarkar, S.;Ganguly, S.;Majumder, G.;Cavallo, F. R.;Dallavalle, G. M.;Rossi, A. M.;Tosi, S.;Gennai, S.;Fanò, L.;Azzurri, P.;Martini, L.;Marone, M.;Bunkowski, K.;Smirnov, V.;Zarubin, A.;Ivanov, Y.;Belyaev, A.;De La Cruz, B.;Merino, G.;Fernandez Menendez, J.;Graziano, A.;Dupont-Sagorin, N.;Santanastasio, F.;Buchmann, M. A.;Kangal, E. E.;Ozturk, S.;Bilin, B.;Ozkorucuklu, S.;Smith, V. J.;Brown, R. M.;Petyt, D.;Cutajar, M.;Petridis, K.;Symonds, P.;Ko, W.;Rutherford, B.;Clare, R.;Jeng, G. Y.;Long, O. R.;Wilken, R.;Andrews, W.;Holzner, A.;Petrucciani, G.;Campagnari, C.;D’Alfonso, M.;Chen, Y.;Alexander, J.;Eggert, N.;Hirschauer, J.;Joshi, U.;Vidal, R.;Yumiceva, F.;Avery, P.;Gartner, J.;Varelas, N.;Griffiths, S.;Swartz, M.;Butz, E.;Hahn, K. A.;Franzoni, G.;Kotov, K.;Lopes Pegna, D.;Ecklund, K. M.;Chung, Y. S.;Patel, R.;Schnetzer, S.;Khotilovich, V.;Pakhotin, Y.;Appelt, E.;Arenton, M. W.;Cepeda, M.;Mohapatra, A.
贡献者:	理學院物理學系
关键词:	High Energy Physics - Experiment;Nuclear Experiment;NUCLEAR PHYSICS AND RADIATION PHYSICS;Physics
日期:	2012-11-26
上传时间:	2026-04-23 12:34:20 (UTC+8)
出版者:	United States: American Physical Society
摘要:	摘要： The suppression of the individual Υ(nS) states in PbPb collisions with respect to their yields in pp data has been measured. The PbPb and pp data sets used in the analysis correspond to integrated luminosities of 150 μb(-1) and 230 nb(-1), respectively, collected in 2011 by the CMS experiment at the LHC, at a center-of-mass energy per nucleon pair of 2.76 TeV. The Υ(nS) yields are measured from the dimuon invariant mass spectra. The suppression of the Υ(nS) yields in PbPb relative to the yields in pp, scaled by the number of nucleon-nucleon collisions, R(AA), is measured as a function of the collision centrality. Integrated over centrality, the R(AA) values are 0.56±0.08(stat)±0.07(syst), 0.12±0.04(stat)±0.02(syst), and lower than 0.10 (at 95% confidence level), for the Υ(1S), Υ(2S), and Υ(3S) states, respectively. The results demonstrate the sequential suppression of the Υ(nS) states in PbPb collisions at LHC energies. 其他題名： Phys Rev Lett 出版者： United States: American Physical Society 出版日期： 2012-11-26 出處： Physical review letters, 2012-11, Vol.109 (22), p.222301, Article 222301 資源來源： American Physical Society Journals 版權： CC0 1.0 - Universal 識別號： ISSN: 0031-9007 識別號： ISSN: 1079-7114 識別號： EISSN: 1079-7114 識別號： DOI: 10.1103/PhysRevLett.109.222301 識別號： PMID: 23368113
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