Indications of suppression of excited Υ states in Pb-Pb collisions at √(s(NN))=2.76 TeV.
Phys Rev Lett 107:5 (2011) 052302
Authors:
S Chatrchyan, V Khachatryan, AM Sirunyan, A Tumasyan, W Adam, T Bergauer, M Dragicevic, J Erö, C Fabjan, M Friedl, R Frühwirth, VM Ghete, J Hammer, S Hänsel, M Hoch, N Hörmann, J Hrubec, M Jeitler, W Kiesenhofer, M Krammer, D Liko, I Mikulec, M Pernicka, B Rahbaran, H Rohringer, R Schöfbeck, J Strauss, A Taurok, F Teischinger, P Wagner, W Waltenberger, G Walzel, E Widl, C-E Wulz, V Mossolov, N Shumeiko, J Suarez Gonzalez, S Bansal, L Benucci, EA De Wolf, X Janssen, J Maes, T Maes, L Mucibello, S Ochesanu, B Roland, R Rougny, M Selvaggi, H Van Haevermaet, P Van Mechelen, N Van Remortel, F Blekman, S Blyweert, J D'Hondt, O Devroede, R Gonzalez Suarez, A Kalogeropoulos, M Maes, W Van Doninck, P Van Mulders, GP Van Onsem, I Villella, O Charaf, B Clerbaux, G De Lentdecker, V Dero, APR Gay, GH Hammad, T Hreus, PE Marage, L Thomas, C Vander Velde, P Vanlaer, V Adler, A Cimmino, S Costantini, M Grunewald, B Klein, J Lellouch, A Marinov, J McCartin, D Ryckbosch, F Thyssen, M Tytgat, L Vanelderen, P Verwilligen, S Walsh, N Zaganidis, S Basegmez, G Bruno, J Caudron, L Ceard, E Cortina Gil, J De Favereau De Jeneret, C Delaere, D Favart, A Giammanco, G Grégoire, J Hollar, V Lemaitre, J Liao, O Militaru, C Nuttens, S Ovyn, D Pagano, A Pin, K Piotrzkowski, N Schul, N Beliy, T Caebergs, E Daubie, GA Alves, L Brito, D De Jesus Damiao, ME Pol, MHG Souza, WL Aldá Júnior, W Carvalho, EM Da Costa, C De Oliveira Martins, S Fonseca De Souza, L Mundim, H Nogima, V Oguri, WL Prado Da Silva, A Santoro, SM Silva Do Amaral, A Sznajder, CA Bernardes, FA Dias, TR Fernandez Perez Tomei, EM Gregores, C Lagana, F Marinho, PG Mercadante, SF Novaes, Sandra S Padula, N Darmenov, V Genchev, P Iaydjiev, S Piperov, M Rodozov, S Stoykova, G Sultanov, V Tcholakov, R Trayanov, A Dimitrov, R Hadjiiska, A Karadzhinova, V Kozhuharov, L Litov, M Mateev, B Pavlov, P Petkov, JG Bian, GM Chen, HS Chen, CH Jiang, D Liang, S Liang, X Meng, J Tao, J Wang, J Wang, X Wang, Z Wang, H Xiao, M Xu, J Zang, Z Zhang, Y Ban, S Guo, Y Guo, W Li, Y Mao, SJ Qian, H Teng, B Zhu, W Zou, A Cabrera, B Gomez Moreno, AA Ocampo Rios, AF Osorio Oliveros, JC Sanabria, N Godinovic, D Lelas, K Lelas, R Plestina, D Polic, I Puljak, Z Antunovic, M Dzelalija, V Brigljevic, S Duric, K Kadija, S Morovic, A Attikis, M Galanti, J Mousa, C Nicolaou, F Ptochos, PA Razis, M Finger, M Finger, Y Assran, A Ellithi Kamel, S Khalil, MA Mahmoud, A Hektor, M Kadastik, M Müntel, M Raidal, L Rebane, A Tiko, V Azzolini, P Eerola, G Fedi, S Czellar, J Härkönen, A Heikkinen, V Karimäki, R Kinnunen, MJ Kortelainen, T Lampén, K Lassila-Perini, S Lehti, T Lindén, P Luukka, T Mäenpää, E Tuominen, J Tuominiemi, E Tuovinen, D Ungaro, L Wendland, K Banzuzi, A Karjalainen, A Korpela, T Tuuva, D Sillou, M Besancon, S Choudhury, M Dejardin, D Denegri, B Fabbro, JL Faure, F Ferri, S Ganjour, FX Gentit, A Givernaud, P Gras, G Hamel de Monchenault, P Jarry, E Locci, J Malcles, M Marionneau, L Millischer, J Rander, A Rosowsky, I Shreyber, M Titov, P Verrecchia, S Baffioni, F Beaudette, L Benhabib, L Bianchini, M Bluj, C Broutin, P Busson, C Charlot, T Dahms, L Dobrzynski, S Elgammal, R Granier de Cassagnac, M Haguenauer, P Miné, C Mironov, C Ochando, P Paganini, D Sabes, R Salerno, Y Sirois, C Thiebaux, B Wyslouch, A Zabi, J-L Agram, J Andrea, D Bloch, D Bodin, J-M Brom, M Cardaci, EC Chabert, C Collard, E Conte, F Drouhin, C Ferro, J-C Fontaine, D Gelé, U Goerlach, S Greder, P Juillot, M Karim, A-C Le Bihan, Y Mikami, P Van Hove, F Fassi, D Mercier, C Baty, S Beauceron, N Beaupere, M Bedjidian, O Bondu, G Boudoul, D Boumediene, H Brun, J Chasserat, R Chierici, D Contardo, P Depasse, H El Mamouni, J Fay, S Gascon, B Ille, T Kurca, T Le Grand, M Lethuillier, L Mirabito, S Perries, V Sordini, S Tosi, Y Tschudi, P Verdier, D Lomidze, G Anagnostou, S Beranek, M Edelhoff, L Feld, N Heracleous, O Hindrichs, R Jussen, K Klein, J Merz, N Mohr, A Ostapchuk, A Perieanu, F Raupach, J Sammet, S Schael, D Sprenger, H Weber, M Weber, B 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Abstract:
A comparison of the relative yields of Υ resonances in the μ(+)μ(-) decay channel in Pb-Pb and pp collisions at a center-of-mass energy per nucleon pair of 2.76 TeV is performed with data collected with the CMS detector at the LHC. Using muons of transverse momentum above 4 GeV/c and pseudorapidity below 2.4, the double ratio of the Υ(2S) and Υ(3S) excited states to the Υ(1S) ground state in Pb-Pb and pp collisions, [Υ(2S+3S)/Υ(1S)](Pb-Pb)/[Υ(2S+3S)/Υ(1S)](pp), is found to be 0.31(-0.15)(+0.19)(stat)±0.03(syst). The probability to obtain the measured value, or lower, if the true double ratio is unity, is calculated to be less than 1%.
