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Please use this identifier to cite or link to this item: http://acervodigital.unesp.br/handle/11449/116240
Title: 
Search for exclusive or semi-exclusive gamma gamma production and observation of exclusive and semi-exclusive e(+)e(-) production in 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
  • Ctr Brasileiro Pesquisas Fis
  • Universidade do Estado do Rio de Janeiro (UERJ)
  • Vienna Univ Technol
  • NICPB
  • Universidade Federal do ABC (UFABC)
  • CALTECH
  • CERN
  • Ecole Polytech
  • Suez Canal Univ
  • Zewail City Sci & Technol
  • Cairo Univ
  • Fayoum Univ
  • British Univ
  • Ain Shams Univ
  • Universidade Estadual Paulista (UNESP)
  • Bulgarian Acad Sci
  • Univ Sofia
  • Inst High Energy Phys
  • Peking Univ
  • Univ Los Andes
  • Tech Univ Split
  • Univ Split
  • Rudjer Boskovic Inst
  • Univ Cyprus
  • Charles Univ Prague
  • Acad Sci Res & Technol Arab Republ Egypt
  • Univ Helsinki
  • Helsinki Inst Phys
  • Natl Ctr Nucl Res
  • Univ Haute Alsace
  • Brandenburg Tech Univ Cottbus
  • Inst Nucl Res ATOMKI
  • Eotvos Lorand Univ
  • Tata Inst Fundamental Res HECR
  • Lappeenranta Univ Technol
  • CEA Saclay
  • Univ Haute Alsace Mulhouse
  • Inst Natl Phys Nucl & Phys Particules
  • Univ Lyon 1
  • Tbilisi State Univ
  • Rhein Westfal TH Aachen
  • DESY
  • Univ Hamburg
  • Univ Karlsruhe
  • Inst Nucl Phys Demokritos
  • Univ Athens
  • Univ Ioannina
  • KFKI Res Inst Particle & Nucl Phys
  • Debrecen Univ Med
  • Panjab Univ
  • Univ Delhi
  • Saha Inst Nucl Phys
  • Bhabha Atom Res Ctr
  • Tata Inst Fundamental Res EHEP
  • Inst Res Fundamental Sci IPM
  • INFN Sez Bari
  • Univ Bari
  • Politecn Bari
  • INFN Sez Bologna
  • Univ Bologna
  • INFN Sez Catania
  • Univ Catania
  • Visva Bharati Univ
  • Sharif Univ Technol
  • Isfahan Univ Technol
  • Shiraz Univ
  • Islamic Azad Univ
  • Univ Rome
  • Univ Basilicata
  • Univ Guglielmo Marconi
  • Lab Nazl Legnaro INFN
  • Univ Siena
  • INFN Sez Firenze
  • Univ Florence
  • INFN Lab Nazl Frascati
  • INFN Sez Genova
  • Univ Genoa
  • INFN Sez Milano Bicocca
  • Univ Milano Bicocca
  • INFN Sez Napoli
  • Univ Naples Federico II
  • INFN Sez Padova
  • Univ Padua
  • Univ Trento Trento
  • INFN Sez Pavia
  • Univ Pavia
  • INFN Sez Perugia
  • Univ Perugia
  • INFN Sez Pisa
  • Univ Pisa
  • Scuola Normale Super Pisa
  • INFN Sez Roma
  • Univ Roma La Sapienza
  • INFN Sez Torino
  • Univ Turin
  • Univ Piemonte Orientale Novara
  • INFN Sez Trieste
  • Univ Trieste
  • Kangwon Natl Univ
  • Kyungpook Natl Univ
  • Chonnam Natl Univ
  • Korea Univ
  • Univ Seoul
  • Sungkyunkwan Univ
  • Vilnius State Univ
  • Ctr Invest & Estudios Avanzados IPN
  • Univ Iberoamer
  • Benemerita Univ Autonoma Puebla
  • Univ Autonoma San Luis Potosi
  • Univ Auckland
  • Univ Canterbury
  • Quaid I Azam Univ
  • Univ Warsaw
  • Lab Instrumentacao & Fis Expt Particulas
  • Joint Inst Nucl Res
  • Petersburg Nucl Phys Inst
  • Russian Acad Sci
  • Inst Theoret & Expt Phys
  • Moscow MV Lomonosov State Univ
  • State Res Ctr Russian Federat
  • Univ Belgrade
  • Vinca Inst Nucl Sci
  • Ctr Invest Energet Medioambientales & Tecnol CIEM
  • CSIC Univ Cantabria
  • Paul Scherrer Inst
  • Swiss Fed Inst Technol
  • Univ Zurich
  • Natl Cent Univ
  • Natl Taiwan Univ NTU
  • Cukurova Univ
  • Middle E Tech Univ
  • Bogazici Univ
  • Istanbul Tech Univ
  • Univ Bucharest
  • Rutherford Appleton Lab
  • Gaziosmanpasa Univ
  • Adiyaman Univ
  • Univ Iowa
  • Mersin Univ
  • Ozyegin Univ
  • Kafkas Univ
  • Suleyman Demirel Univ
  • Ege Univ
  • Baylor Univ
  • Univ Alabama
  • Univ Calif Riverside
  • Univ Calif San Diego
  • Univ Calif Santa Barbara
  • Carnegie Mellon Univ
  • Univ Colorado
  • Cornell Univ
  • Fairfield Univ
  • Fermilab Natl Accelerator Lab
  • Univ Florida
  • Florida Int Univ
  • Florida State Univ
  • Florida Inst Technol
  • Univ Illinois Chicago UIC
  • Johns Hopkins Univ
  • Univ Kansas
  • Kansas State Univ
  • Lawrence Livermore Natl Lab
  • Univ Maryland
  • MIT
  • Univ Minnesota
  • Univ Mississippi
  • Univ Nebraska Lincoln
  • SUNY Buffalo
  • Northeastern Univ
  • Northwestern Univ
  • Univ Notre Dame
  • Ohio State Univ
  • Princeton Univ
  • Purdue Univ
  • Univ Puerto Rico
  • Purdue Univ Calumet
  • Rice Univ
  • Univ Rochester
  • Rockefeller Univ
  • Univ Tennessee
  • Texas A&M Univ
  • Texas Tech Univ
  • Vanderbilt Univ
  • Univ Virginia
  • Wayne State Univ
  • Univ Wisconsin
ISSN: 
1029-8479
Sponsorship: 
  • BMWF (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)
  • NSFC (China)
  • COLCIENCIAS (Colombia)
  • MSES (Croatia)
  • RPF (Cyprus)
  • MoER (Estonia)
  • ERDF (Estonia)
  • Academy of Finland (Finland)
  • MEC (Finland)
  • HIP (Finland)
  • CEA (France)
  • CNRS/IN2P3 (France)
  • BMBF (Germany)
  • DFG (Germany)
  • HGF (Germany)
  • GSRT (Greece)
  • OTKA (Hungary)
  • NKTH (Hungary)
  • DAE (India)
  • DST (India)
  • IPM (Iran)
  • SFI (Ireland)
  • INFN (Italy)
  • NRF (Korea)
  • WCU (Korea)
  • LAS (Lithuania)
  • CINVESTAV (Mexico)
  • CONACYT (Mexico)
  • SEP (Mexico)
  • UASLP-FAI (Mexico)
  • MSI (New Zealand)
  • PAEC (Pakistan)
  • MSHE (Poland)
  • NSC (Poland)
  • FCT (Portugal)
  • JINR (Armenia)
  • JINR (Belarus)
  • JINR (Georgia)
  • JINR (Ukraine)
  • JINR (Uzbekistan)
  • MON (Russia)
  • RosAtom (Russia)
  • RAS (Russia)
  • RFBR (Russia)
  • MSTD (Serbia)
  • SEIDI (Spain)
  • CPAN (Spain)
  • Swiss Funding Agencies (Switzerland)
  • NSC (Taipei)
  • ThEP (Thailand)
  • IPST (Thailand)
  • NECTEC (Thailand)
  • TUBITAK (Turkey)
  • TAEK (Turkey)
  • NASU (Ukraine)
  • STFC (United Kingdom)
  • DOE (USA)
  • NSF (USA)
  • Marie-Curie programme (European Union)
  • European Research Council (European Union)
  • Leventis Foundation
  • A. P. Sloan Foundation
  • Alexander von Humboldt Foundation
  • Austrian Science Fund (FWF)
  • 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 Czech Republic
  • Council of Science and Industrial Research, India
  • Compagnia di San Paolo (Torino)
  • HOMING PLUS programme of Foundation for Polish Science
  • European Union, Regional Development Fund
Sponsorship Process Number: 
MoER (Estonia)SF0690030s09
Abstract: 
A search for exclusive or semi-exclusive gamma gamma production, pp -> p(()*()) + gamma gamma + p(()*()) (where p* stands for a diffractively-dissociated proton), and the observation of exclusive and semi-exclusive e(+)e(-) production, pp -> p(()*()) + e(+)e(-) + p(()*()), in proton-proton collisions at root s = 7 TeV, are presented. The analysis is based on a data sample corresponding to an integrated luminosity of 36 pb(-1) recorded by the CMS experiment at the LHC at low instantaneous luminosities. Candidate gamma gamma or e(+)e(-) events are selected by requiring the presence of two photons or a positron and an electron, each with transverse energy E-T > 5.5 GeV and pseudorapidity vertical bar eta vertical bar < 2.5, and no other particles in the region vertical bar eta vertical bar < 5.2. No exclusive or semi-exclusive diphoton candidates are found in the data. An upper limit on the cross section for the reaction pp -> p(()*()) + gamma gamma + p(()*()), within the above kinematic selections, is set at 1.18 pb at 95% confidence level. Seventeen exclusive or semi-exclusive dielectron candidates are observed, with an estimated background of 0.85 +/- 0.28 (stat.) events, in agreement with the QED-based prediction of 16.3 +/- 1.3 (syst.) events.
Issue Date: 
1-Nov-2012
Citation: 
Journal Of High Energy Physics. New York: Springer, n. 11, 35 p., 2012.
Time Duration: 
35
Publisher: 
Springer
Keywords: 
Hadron-Hadron Scattering
Source: 
http://dx.doi.org/10.1007/JHEP11(2012)080
URI: 
Access Rights: 
Acesso aberto
Type: 
outro
Source:
http://repositorio.unesp.br/handle/11449/116240
Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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