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Please use this identifier to cite or link to this item: http://acervodigital.unesp.br/handle/11449/24743
Title: 
Forward energy flow, central charged-particle multiplicities, and pseudorapidity gaps in W and Z boson events from pp collisions at root s=7 TeV
Author(s): 
Institution: 
  • Yerevan Phys Inst
  • Inst Hochenergiephys OeAW
  • Natl Ctr Particle & High Energy Phys
  • Univ Antwerp
  • Vrije Univ Brussel
  • Univ Libre Brussels
  • Univ Ghent
  • Catholic Univ Louvain
  • Univ Mons
  • Centro Brasileiro de Pesquisas Físicas (CBPF)
  • Universidade do Estado do Rio de Janeiro (UERJ)
  • Universidade Estadual Paulista (UNESP)
  • Bulgarian Acad Sci
  • Univ Sofia
  • Inst High Energy Phys
  • Peking Univ
  • Universidad de los Andes
  • Tech Univ Split
  • Univ Split
  • Rudjer Boskovic Inst
  • Univ Cyprus
  • Charles Univ Prague
  • Acad Sci Res & Technol Arab Republ Egypt
  • NICPB
  • Univ Helsinki
  • Helsinki Inst Phys
  • Lappeenranta Univ Technol
  • CNRS
  • CEA Saclay
  • Ecole Polytech
  • Univ Haute Alsace Mulhouse
  • Ctr Calcul
  • Univ Lyon 1
  • Tbilisi State Univ
  • RWTH Aachen University
  • DESY
  • Univ Hamburg
  • Univ Karlsruhe
  • Inst Nucl Phys Demokritos
  • Univ Athens
  • Univ Ioannina
  • KFKI Res Inst Particle & Nucl Phys
  • Inst Nucl Res ATOMKI
  • Debrecen Univ Med
  • Panjab Univ
  • University of Delhi
  • Saha Inst Nucl Phys
  • Bhabha Atom Res Ctr
  • Tata Inst Fundamental Res EHEP
  • Tata Inst Fundamental Res HECR
  • Inst Res & Fundamental Sci IPM
  • Ist Nazl Fis Nucl
  • Univ Bari
  • Politecn Bari
  • Univ Bologna
  • Univ Catania
  • Univ Florence
  • Univ Milano Bicocca
  • Univ Naples Federico II
  • Univ Padua
  • Univ Trento Trento
  • Univ Pavia
  • Univ Perugia
  • Univ Pisa
  • Scuola Normale Super Pisa
  • Univ Roma La Sapienza
  • Univ Turin
  • Univ Piemonte Orientale Novara
  • Ist Nazl Fis Nuc
  • Univ Trieste
  • Kangwon Natl Univ
  • Kyungpook Natl Univ
  • Chonnam Natl Univ
  • Korea University
  • Univ Seoul
  • Sungkyunkwan Univ
  • Vilnius State Univ
  • IPN
  • Univ Iberoamer
  • Benemerita Univ Autonoma Puebla
  • Univ Autonoma San Luis Potosi
  • Univ Auckland
  • Univ Canterbury
  • Quaid I Azam Univ
  • Univ Warsaw
  • Soltan Inst Nucl Studies
  • Lab Instrumentacao & Fis Expt Particulas
  • Joint Inst Nucl Res
  • Petersburg Nucl Phys Inst
  • Russian Acad Sci
  • Institute for Theoretical and Experimental Physics (ITEP)
  • Moscow MV Lomonosov State Univ
  • PN Lebedev Phys Inst
  • University of Belgrade
  • CIEMAT
  • Univ Autonoma Madrid
  • Univ Oviedo
  • Univ Cantabria
  • CERN
  • Paul Scherrer Inst
  • ETH
  • Univ Zurich
  • Natl Cent Univ
  • Natl Taiwan Univ
  • Cukurova Univ
  • Middle E Tech Univ
  • Bogazici Univ
  • Natl Sci Ctr
  • Univ Bristol
  • Rutherford Appleton Lab
  • Univ London Imperial Coll Sci Technol & Med
  • Brunel Univ
  • Baylor Univ
  • Univ Alabama
  • Boston University
  • Brown University
  • Univ Calif Davis
  • Univ Calif Los Angeles
  • University of California, Riverside (UCR)
  • Univ Calif San Diego
  • Univ Calif Santa Barbara
  • CALTECH
  • Carnegie Mellon Univ
  • Univ Colorado
  • Cornell Univ
  • Fairfield Univ
  • Fermilab Natl Accelerator Lab
  • Univ Florida
  • Florida Int Univ
  • Florida State University
  • Florida Inst Technol
  • Univ Illinois Chicago UIC
  • Univ Iowa
  • Johns Hopkins Univ
  • University of Kansas (KU)
  • Kansas State University
  • Lawrence Livermore Natl Lab
  • University of Maryland
  • MIT
  • Univ Minnesota
  • University of Mississippi
  • Univ Nebraska
  • SUNY Buffalo
  • Northeastern University
  • Northwestern University (NU)
  • Univ Notre Dame
  • Ohio State Univ
  • Princeton University
  • Univ Puerto Rico
  • Purdue Univ
  • Purdue University Calumet
  • Rice University
  • University of Rochester
  • Rockefeller Univ
  • Rutgers State Univ
  • Univ Tennessee
  • Texas A&M Univ
  • Texas Tech Univ
  • Vanderbilt Univ
  • University of Virginia (UVA)
  • Wayne State Univ
  • Univ Wisconsin
  • Universidade Federal do ABC (UFABC)
  • Suez Canal Univ
  • Cairo Univ
  • British Univ
  • Fayoum Univ
  • Ain Shams Univ
  • Univ Haute Alsace
  • Brandenburg Tech Univ Cottbus
  • Eotvos Lorand Univ
  • Visva Bharati Univ
  • Sharif Univ Technol
  • Isfahan Univ Technol
  • Shiraz Univ
  • Univ Roma
  • Univ Basilicata
  • Univ Siena
  • Univ Geneva
  • Sezione Ist Nazl Fis Nucl
  • Gaziosmanpasa Univ
  • Adiyaman Univ
  • Mersin Univ
  • Izmir Inst Technol
  • Kafkas Univ
  • Suleyman Demirel Univ
  • Ege Univ
  • Univ Southampton
  • Utah Valley Univ
  • Los Alamos Natl Lab
  • Erzincan Univ
ISSN: 
1434-6044
Sponsorship: 
  • 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)
Abstract: 
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.))%.
Issue Date: 
1-Jan-2012
Citation: 
European Physical Journal C. New York: Springer, v. 72, n. 1, p. 28, 2012.
Time Duration: 
28
Publisher: 
Springer
Source: 
http://dx.doi.org/10.1140/epjc/s10052-011-1839-3
URI: 
http://hdl.handle.net/11449/24743
Access Rights: 
Acesso aberto
Type: 
outro
Source:
http://repositorio.unesp.br/handle/11449/24743
Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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