Open Access#1212013
Forward energy flow, central charged-particle multiplicities, and pseudorapidity gaps in W and Z boson events from pp collisions at root s=7 TeV
Chatrchyan, S; Khachatryan, V; Sirunyan, A. M; Tumasyan, A; Adam, W; Bergauer, T; Dragicevic, M; Eroe, J
Chatrchyan, S; Khachatryan, V; Sirunyan, A. M; Tumasyan, A; Adam, W; Bergauer, T; Dragicevic, M; Eroe, J; Fabjan, C; Friedl, M; Fruehwirth, R; Ghete, V. M; Hammer, J; Haensel, S; Hoch, M; Hoermann, N; Hrubec, J; Jeitler, M; Kiesenhofer, W; Krammer, M; Liko, D; Mikulec, I; Pernicka, M; Rahbaran, B; Rohringer, H; Schoefbeck, R; Strauss, J; Taurok, A; Teischinger, F; Trauner, C; Wagner, P; Waltenberger, W; Walzel, G; Widl, E; Wulz, C. -E; Mossolov, V; Shumeiko, N; Gonzalez, J. Suarez; Bansal, S; Benucci, L; De Wolf, E. A; Janssen, X; Maes, T; Mucibello, L; Ochesanu, S; Roland, B; Rougny, R; Selvaggi, M; Van Haevermaet, H; Van Mechelen, P; Van Remortel, N; Blekman, F; Blyweert, S; D'Hondt, J; Devroede, O; Suarez, R. Gonzalez; Kalogeropoulos, A; Maes, M; Van Doninck, W; Van Mulders, P; Van Onsem, G. P; Villella, I; Charaf, O; Clerbaux, B; De Lentdecker, G; Dero, V; Gay, A. P. R; Hammad, G. H; Hreus, T; Marage, P. E; Raval, A; Thomas, L; Vander Marcken, G; Vander Velde, C; Vanlaer, P; Adler, V; Cimmino, A; Costantini, S; Grunewald, M; Klein, B; Lellouch, J; Marinov, A; Mccartin, J; Ryckbosch, D; Thyssen, F; Tytgat, M; Vanelderen, L; Verwilligen, P; Walsh, S; Zaganidis, N; Basegmez, S; Bruno, G; Caudron, J; Ceard, L; Gil, E. Cortina; De Jeneret, J. de Favereau; Delaere, C; Favart, D; Giammanco, A; Gregoire, G; Hollar, J; Lemaitre, V; Liao, J; Militaru, O; Nuttens, C; Ovyn, S; Pagano, D; Pin, A; Piotrzkowski, K; Schul, N; Beliy, N; Caebergs, T; Daubie, E; Alves, G. A; Brito, L; De Jesus Damiao, D; Pol, M. E; Souza, M. H. G; Alda Junior, W. L; Carvalho, W; Da Costa, E. M; De Oliveira Martins, C; Fonseca de Souza, S; Matos Figueiredo, D; Mundim, L; Nogima, H; Oguri, V; Prado da Silva, W. L; Santoro, A; Silva do Amaral, S. M; Sznajder, A; Anjos, T. S; Bernardes, C. A; Dias, F. A; Fernandez Perez Tomei, T. R; Gregores, E. M; Lagana, C; Marinho, F; Mercadante, P. G; Novaes, Sérgio Ferraz; Padula, S. 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FMSR (Austria) ; Fonds de la Recherche Scientifique (FNRS) ; 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) ; Organisation Européenne pour la Recherche Nucléaire (CERN) ; Chinese Academy of Sciences (CAS) ; MoST, (China) ; National Natural Science Foundation of China (NSFC) ; COLCIENCIAS (Colombia) ; MSES (Croatia) ; Research Promotion Foundation (RPF) ; Academy of Sciences (Estonia) ; National Institute of Chemical Physics and Biophysics (NICPB) ; Academy of Finland ; ME (Finland) ; Helsinki Institute of Physics (HIP) ; Commissariat à l'énergie atomique et aux énergies alternatives (CEA) ; Institut national de physique nucléaire et de physique des particules (IN2P3/CNRS) ; Bundesministerium für Bildung und Forschung (BMBF) ; Deutsche Forschungsgemeinschaft (DFG) ; HGF (Germany) ; General Secretariat for Research and Technology (GSRT) ; Hungarian Scientific Research Fund (OTKA) ; NKTH (Hungary) ; Department of Atomic Energy (DAE) - India ; Department of Science and Technology (DST) - India ; Institute for Research in Fundamental Sciences (IPM) ; Science Foundation Ireland (SFI) ; Istituto Nazionale di Fisica Nucleare (INFN) ; National Research Foundation of Korea (NRF) ; WCU (Korea) ; LAS (Lithuania) ; Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional (CINVESTAV) ; Consejo Nacional de Ciencia y Tecnología (CONACYT) ; SEP, (Mexico) ; UASLP-FAI (Mexico) ; Pakistan Atomic Energy Commission (PAEC) ; SCSR (Poland) ; Fundação para a Ciência e a Tecnologia (FCT) ; Joint Institute for Nuclear Research (JINR) ; MST (Russia) ; MAE (Russia) ; MSTDS (Serbia) ; MICINN (Spain) ; Centro Nacional de Física de Partículas, Astropartículas y Nuclear (CPAN) ; Swiss Funding Agencies (Switzerland) ; NSC (Taipei) ; Scientific and Technological Research Council of Turkey (TUBITAK) ; Türkiye Atom Enerjisi Kurumu (TAEK) ; Science and Technology Facilities Council (STFC) ; DOE (USA) ; National Science Foundation (NSF) - USA ; European Union ; Leventis Foundation ; A. P. Sloan Foundation ; Alexander von Humboldt Foundation ; Associazione per lo Sviluppo Scientifico e Tecnologico del Piemonte (Italy) ; A study of forward energy flow and central charged-particle multiplicity in events with W and Z bosons decaying into leptons is presented. The analysis uses a sample of 7 TeV pp collisions, corresponding to an integrated luminosity of 36 pb(-1), recorded by the CMS experiment at the LHC. The observed forward energy depositions, their correlations, and the central charged-particle multiplicities are not well described by the available non-diffractive soft-hadron production models. A study of about 300 events with no significant energy deposited in one of the forward calorimeters, corresponding to a pseudorapidity gap of at least 1.9 units, is also presented. An indication for a diffractive component in these events comes from the observation that the majority of the charged leptons from the W(Z) decays are found in the hemisphere opposite to the gap. When fitting the signed lepton pseudorapidity distribution of these events with predicted distributions from an admixture of diffractive (POMPYT) and non-diffractive (PYTHIA) Monte Carlo simulations, the diffractive component is determined to be (50.0 +/- 9.3 (stat.) +/- 5.2 (syst.))%.
