Open Access#612015
Measurement of the production cross section ratio sigma(chi b2(1P))/sigma(chi b1(1P)) in pp collisions at √s=8TeV
Khachatryan, V; Sirunyan, A. M; Tumasyan, A; Adam, W; Bergauer, T; Dragicevic, M; Ero, J; Fabjan, C; Friedl, M; Fruhwirth, R; Ghete, V. M; Hartl, C; Hormann, N; Hrubec, J; Jeitler, M; Kiesenhofer, W; Knunz, V; Krammer, M; Kratschmer, I; Liko, D; Mikulec, I; Rabady, D; Rahbaran, B; Rohringer, H; Schoefbeck, R; Strauss, J; Taurok, A; Treberer-Treberspurg, W; Waltenberger, W; Wulz, C. -E; Mossolov, V; Shumeiko, N; SuarezGonzalez, J; Alderweireldt, S; Bansal, M; Bansal, S; Cornelis, T; DeWolf, E. A; Janssen, X; Knutsson, A; Luyckx, S; Ochesanu, S; Roland, B; Rougny, R; Van De Klundert, M; Van Haevermaet, H; Van Mechelen, P; Van Remortel, N; Van Spilbeeck, A; Blekman, F; Blyweert, S; D'Hondt, J; Daci, N; Heracleous, N; Keaveney, J; Lowette, S; Maes, M; Olbrechts, A; Python, Q; Strom, D; Tavernier, S; Van Doninck, W; Van Mulders, P; Van Onsem, G. P; Villella, I; Caillol, C; Clerbaux, B; De Lentdecker, G; Dobur, D; Favart, L; Gay, A. P. R; Grebenyuk, A; Leonard, A; Mohammadi, A; Pernie, L; Reis, T; Seva, T; Thomas, L; Velde, C. Vander; Vanlaer, P; Wang, J; Adler, V; Beernaert, K; Benucci, L; Cimmino, A; Costantini, S; Crucy, S; Dildick, S; Fagot, A; Garcia, G; Mccartin, J; Rios, A. A. Ocampo; Ryckbosch, D; Diblen, S. Salva; Sigamani, M; Strobbe, N; Thyssen, F; Tytgat, M; Yazgan, E; Zaganidis, N; Basegmez, S; Beluffi, C; Bruno, G; Castello, R; Caudron, A; Ceard, L; Da Silveira, G. G; Delaere, C; Du Pree, T; Favart, D; Forthomme, L; Giammanco, A; Hollar, J; Jez, P; Komm, M; Lemaitre, V; Nuttens, C; Pagano, D; Perrini, L; Pin, A; Piotrzkowski, K; Popov, A; Quertenmont, L; Selvaggi, M; Marono, M. Vidal; Garcia, J. M. Vizan; Beliy, N; Caebergs, T; Daubie, E; Hammad, G. H; Junior, W. L. Alda; Alves, G. A; Brito, L; Junior, M. Correa Martins; Martins, T. Dos Reis; Herrera, C. Mora; Pol, M. E; Carvalho, W; Chinellato, J; Custodio, A; Da Costa, E. M; Damiao, D. De Jesus; Martins, C. De Oliveira; De Souza, S. 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BMWFW (Austria) ; FWF (Austria) ; FNRS (Belgium) ; FWO (Belgium) ; Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) ; Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) ; Fundação de Amparo à Pesquisa do Estado do Rio de Janeiro (FAPERJ) ; Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) ; MES (Bulgaria) ; CERN ; CAS (China) ; MoST (China) ; COLCIENCIAS (Colombia) ; MSES (Croatia) ; CSF (Croatia) ; RPF (Cyprus) ; MoER (Estonia) ; ERC IUT (Estonia) ; ERDF (Estonia) ; Academy of Finland (Finland) ; MEC ; HIP (Finland) ; CEA and CNRS/IN2P3 (France) ; BMBF ; DFG ; HGF (Germany) ; GSRT (Greece) ; OTKA and NIH (Hungary) ; DAE ; DST (India) ; IPM (Iran) ; SFI (Ireland) ; INFN (Italy) ; NRF ; WCU (Republic of Korea) ; LAS (Lithuania) ; MOE and UM (Malaysia) ; CINVESTAV ; CONACYT ; SEP ; UASLP-FAI (Mexico) ; MBIE (New Zealand) ; PAEC (Pakistan) ; MSHE ; NSC (Poland) ; FCT (Portugal) ; JINR (Dubna) ; MON ; RosAtom ; RAS ; RFBR (Russia) ; MESTD (Serbia) ; SEIDI ; CPAN (Spain) ; Swiss Funding Agencies (Switzerland) ; MST (Taipei) ; ThEPCenter ; IPST ; STAR ; NSTDA (Thailand) ; TUBITAK ; TAEK (Turkey) ; NASU ; SFFR (Ukraine) ; STFC (United Kingdom) ; DOE ; NSF (USA) ; Marie-Curie programme ; European Research Council ; EPLANET (European Union) ; Leventis Foundation ; A. P. Sloan Foundation ; Alexander von Humboldt Foundation ; Belgian Federal Science Policy Office ; Fonds pour la Formation a la Recherche dans l'Industrie et dans l'Agriculture (FRIA-Belgium) ; Agentschap voor Innovatie door Wetenschap en Technologie (IWT-Belgium) ; Ministry of Education, Youth and Sports (MEYS) of the Czech Republic ; Council of Science and Industrial Research, India ; HOMING PLUS programme of Foundation For Polish Science ; European Union, Regional Development Fund ; Compagnia di San Paolo (Torino) ; Consorzio per la Fisica (Trieste) ; MIUR project (Italy) ; EU-ESF ; Greek NSRF ; National Priorities Research Program by Qatar National Research Fund ; MIUR project (Italy): 20108T4XTM ; A measurement of the production cross section ratio sigma(chi b2(1P))/sigma(chi b1(1P)) is presented. The chi b1 (1P) and chi b2 (1P) bottomonium states, promptly produced in pp collisions at root s = 8TeV, are detected by the CMS experiment at the CERN LHC through their radiative decays chi b1,2(1P) -> Y(1S) + gamma. The emitted photons are measured through their conversion to e(+) e(-) pairs, whose reconstruction allows the two states to be resolved. The Y(1S) is measured through its decay to two muons. An event sample corresponding to an integrated luminosity of 20.7 fb(-1) is used to measure the cross section ratio in a phase-space region defined by the photon pseudorapidity, vertical bar eta(gamma)vertical bar < 1.0; the Y(1S) rapidity, vertical bar y(Y)vertical bar < 1.5; and the Y(1S) transverse momentum, 7 < p(T)(Y) < 40 GeV. The cross section ratio shows no significant dependence on the.(1S) transverse momentum, with a measured average value of 0.85 +/- 0.07 (stat + syst) +/- 0.08 (BF), where the first uncertainty is the combination of the experimental statistical and systematic uncertainties and the second is from the uncertainty in the ratio of the chi b branching fractions. (C) 2015 CERN for the benefit of the CMS Collaboration. Published by Elsevier B.V.
