Measurement of prompt J/ψ pair production in pp collisions at√s = 7 Tev

Abstract: Production of prompt J/ψ meson pairs in proton-proton collisions at (formula presented.) = 7 TeV is measured with the CMS experiment at the LHC in a data sample corresponding to an integrated luminosity of about 4.7 fb−1. The two J/ψ mesons are fully reconstructed via their decays into μ+μ− pairs. This observation provides for the first time access to the high-transverse-momentum region of J/ψ pair production where model predictions are not yet established. The total and differential cross sections are measured in a phase space defined by the individual J/ψ transverse momentum (pTJ/ψ) and rapidity (|yJ/ψ|): |yJ/ψ | 6.5 GeV/c; 1.2 4.5 GeV/c. The total cross section, assuming unpolarized prompt J/ψ pair production is 1.49 ± 0.07 (stat) ±0.13 (syst) nb. Different assumptions about the J/ψ polarization imply modifications to the cross section ranging from −31% to +27%

Study of Vector Boson Scattering and Search for New Physics in Events with Two Same-Sign Leptons and Two Jets

A study of vector boson scattering in pp collisions at a center-of-mass energy of 8 TeV is presented. The data sample corresponds to an integrated luminosity of 19.4 fb(-1) collected with the CMS detector. Candidate events are selected with exactly two leptons of the same charge, two jets with large rapidity separation and high dijet mass, and moderate missing transverse energy. The signal region is expected to be dominated by electroweak same-sign W-boson pair production. The observation agrees with the standard model prediction. The observed significance is 2.0 standard deviations, where a significance of 3.1 standard deviations is expected based on the standard model. Cross section measurements for (WW +/-)-W-+/- and WZ processes in the fiducial region are reported. Bounds on the structure of quartic vector-boson interactions are given in the framework of dimension-eight effective field theory operators, as well as limits on the production of doubly charged Higgs bosons

Search for neutral MSSM Higgs bosons decaying to a pair of tau leptons in pp collisions

A search for neutral Higgs bosons in the minimal supersymmetric extension of the standard model (MSSM) decaying to tau-lepton pairs in pp collisions is performed, using events recorded by the CMS experiment at the LHC. The dataset corresponds to an integrated luminosity of 24.6 fb(-1), with 4.9 fb(-1) at 7TeV and 19.7 fb(-1) at 8TeV. To enhance the sensitivity to neutral MSSM Higgs bosons, the search includes the case where the Higgs boson is produced in association with a b-quark jet. No excess is observed in the tau-lepton-pair invariant mass spectrum. Exclusion limits are presented in the MSSM parameter space for different benchmark scenarios, m(h)(max), m(h)(mod+), m(h)(mod-), light-stop, light-stau, T-phobic, and low-m(H). Upper limits on the cross section times branching fraction for gluon fusion and b-quark associated Higgs boson production are also given

Identification techniques for highly boosted W bosons that decay into hadrons

In searches for new physics in the energy regime of the LHC, it is becoming increasingly important to distinguish single-jet objects that originate from the merging of the decay products of W bosons produced with high transverse momenta from jets initiated by single partons. Algorithms are defined to identify such W jets for different signals of interest, using techniques that are also applicable to other decays of bosons to hadrons that result in a single jet, such as those from highly boosted Z and Higgs bosons. The efficiency for tagging W jets is measured in data collected with the CMS detector at a center-of-mass energy of 8TeV, corresponding to an integrated luminosity of 19.7 fb(-1). The performance of W tagging in data is compared with predictions from several Monte Carlo simulators.Austrian Federal Ministry of Science, Research and EconomyAustrian Science FundBelgian Fonds de la Recherche ScientifiqueFonds voor Wetenschappelijk OnderzoekConselho 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)Bulgarian Ministry of Education and ScienceCERNChinese Academy of SciencesMinistry of Science and TechnologyNational Natural Science Foundation of ChinaColombian Funding Agency (COLCIENCIAS)Croatian Ministry of Science, Education and SportCroatian Science FoundationResearch Promotion Foundation, CyprusMinistry of Education and Research, Estonian Research CouncilEuropean Regional Development Fund, EstoniaAcademy of FinlandFinnish Ministry of Education and CultureHelsinki Institute of PhysicsInstitut National de Physique Nucleaire et de Physique des Particules / CNRSCommissariat a l'Energie Atomique et auxEnergies Alternatives / CEA, FranceBundesministerium fur Bildung und Forschung, GermanyDeutsche Forschungsgemeinschaft, GermanyHelmholtz-Gemeinschaft Deutscher Forschungszentren, GermanyGeneral Secretariat for Research and Technology, GreeceNational Scientific Research FoundationNational Innovation Office, HungaryDepartment of Atomic EnergyDepartment of Science and Technology, IndiaInstitute for Studies in Theoretical Physics and Mathematics, IranScience Foundation, IrelandIstituto Nazionale di Fisica Nucleare, ItalyKorean Ministry of Education, Science and TechnologyWorld Class University program of NRF, Republic of KoreaLithuanian Academy of SciencesMinistry of EducationUniversity of Malaya (Malaysia)CINVESTAVCONACYTSEPUASLP-FAIMinistry of Business, Innovation and Employment, New ZealandPakistan Atomic Energy CommissionMinistry of Science and Higher EducationNational Science Centre, PolandFundacao para a Ciencia e a Tecnologia, PortugalJINR, DubnaMinistry of Education and Science of the Russian FederationFederal Agency of Atomic Energy of the Russian FederationRussian Academy of ScienceSRussian Foundation for Basic ResearchMinistry of Education, Science and Technological Development of SerbiaSecretaria de Estado de Investigacion, Desarrollo e Innovacion and Programa Consolider-IngenioETH BoardETH ZurichPSISNFUniZHCantonMinistry of Science and Technology, TaipeiThailand Center of Excellence in PhysicsInstitute for the Promotion of Teaching Science and Technology of ThailandSpecial Task Force for Activating ResearchNational Science and Technology Development Agency of ThailandScientific and Technical Research Council of TurkeyTurkish Atomic Energy AuthorityNational Academy of Sciences of UkraineState Fund for Fundamental Researches, UkraineScience and Technology Facilities Council, U.K.US Department of EnergyUS National Science FoundationMarie-Curie programmeEuropean Research CouncilEPLANET (European Union)Leventis FoundationA. P. Sloan FoundationAlexander von Humboldt FoundationBelgian Federal Science Policy OfficeFonds 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 RepublicCouncil of Science and Industrial Research, IndiaHOMING PLUS programme of Foundation for Polish ScienceEuropean UnionRegional Development FundCompagnia di San Paolo (Torino)Consorzio per la Fisica (Trieste)MIUR project (Italy)Thalis and Aristeia programmesEU-ESFNSRFNational Priorities Research Program by Qatar National Research FundYerevan Phys Inst, Yerevan 375036, ArmeniaAustrian Acad Sci, Inst Hochenergiephys, OeAW, A-1050 Vienna, AustriaNatl Ctr Particle &High Energy Phys, Minsk, ByelarusUniv Antwerp, B-2020 Antwerp, BelgiumVrije Univ Brussel, Brussels, BelgiumUniv Libre Bruxelles, Brussels, BelgiumUniv Ghent, B-9000 Ghent, BelgiumCatholic Univ Louvain, Louvain, 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SwitzerlandGaziosmanpasa Univ, Tokat, TurkeyAdiyaman Univ, Adiyaman, TurkeyCag Univ, Mersin, TurkeyIzmir Inst Technol, Izmir, TurkeyOzyegin Univ, Istanbul, TurkeyMarmara Univ, Istanbul, TurkeyKafkas Univ, Kars, TurkeyUniv Southampton, Sch Phys &Astron, Southampton, Hants, EnglandUniv Belgrade, Fac Phys &Vinca, Inst Sci Nucl, Belgrade, SerbiaMimar Sinan Univ, Istanbul, TurkeyArgonne Natl Lab, Argonne, IL 60439 USAErzincan Univ, Erzincan, TurkeyYildiz Tekn Univ, Istanbul, TurkeyTexas A&M Univ, Doha, QatarUniv Estadual Paulista, Sao Paulo, BrazilMinistry of Education and Research, Estonian Research Council: IUT23-4Ministry of Education and Research, Estonian Research Council: IUT236MIUR project (Italy): 20108T4XT