Search for s channel single top quark production in pp collisions at root s=7 and 8 TeV

The Collaboration Cms; V. Khachatryan; Bora Işıldak; Collaboration, C; Abdulla Abdulsalam

doi:10.1007/JHEP09(2016)027

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No. of bitstreams: 0 Previous issue date: 2016-09-06 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) NSFC (China) COLCIENCIAS (Colombia) MSES (Croatia) CSF (Croatia) RPF (Cyprus) MoER (Estonia) ERC IUT (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) NIH (Hungary) DAE (India) DST (India) IPM (Iran) SFI (Ireland) INFN (Italy) MSIP (Republic of Korea) NRF (Republic of Korea) LAS (Lithuania) MOE (Malaysia) UM (Malaysia) CINVESTAV (Mexico) CONACYT (Mexico) SEP (Mexico) UASLP-FAI (Mexico) MBIE (New Zealand) PAEC (Pakistan) MSHE (Poland) NSC (Poland) FCT (Portugal) JINR (Dubna) MON (Russia) RosAtom (Russia) RAS (Russia) RFBR (Russia) MESTD (Serbia) SEIDI (Spain) CPAN (Spain) Swiss Funding Agencies (Switzerland) MST (Taipei) ThEPCenter (Thailand) IPST (Thailand) STAR (Thailand) NSTDA (Thailand) TUBITAK (Turkey) TAEK (Turkey) NASU (Ukraine) SFFR (Ukraine) STFC (United Kingdom) DOE (USA) 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 the Foundation for Polish Science European Union Regional Development Fund OPUS programme of the National Science Center (Poland) 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 Rachadapisek Sompot Fund for Postdoctoral Fellowship, Chulalongkorn University (Thailand) Welch Foundation Science and Technology Facilities Council A search is presented for single top quark production in the s channel in proton-proton collisions with the CMS detector at the CERN LHC in decay modes of the top quark containing a muon or an electron in the final state. The signal is extracted through a maximum-likelihood fit to the distribution of a multivariate discriminant defined using boosted decision trees to separate the expected signal contribution from background processes. The analysis uses data collected at centre-of-mass energies of 7 and 8 TeV and corresponding to integrated luminosities of 5.1 and 19.7 fb(-1), respectively. The measured cross sections of 7.1 +/- 8.1 pb (at 7 TeV) and 13.4 +/- 7.3 pb (at 8 TeV) result in a best fit value of 2.0 +/- 0.9 for the combined ratio of the measured and expected values. The signal significance is 2.5 standard deviations, and the upper limit on the rate relative to the standard model expectation is 4.7 at 95% confidence level. Yerevan Phys Inst, Yerevan, Armenia Inst Hochenergiephys OeAW, Vienna, Austria Natl Ctr Particle & High Energy Phys, Minsk, Byelarus Univ Antwerp, Antwerp, Belgium Vrije Univ Brussel, Brussels, Belgium Univ Libre Bruxelles, Brussels, Belgium Univ Ghent, Ghent, Belgium Catholic Univ Louvain, Louvain La Neuve, Belgium Univ Mons, Mons, Belgium Ctr Brasileiro Pesquisas Fis, Rio De Janeiro, Brazil Univ Estado Rio de Janeiro, Rio De Janeiro, Brazil Univ Estadual Paulista, Sao Paulo, Brazil Univ Fed ABC, Sao Paulo, Brazil Inst Nucl Energy Res, Sofia, Bulgaria Univ Sofia, Sofia, Bulgaria Inst High Energy Phys, Beijing, Peoples R China Peking Univ, State Key Lab Nucl Phys & Technol, Beijing, Peoples R China Univ Los Andes, Bogota, Colombia Univ Split, Fac Elect Engn Mech Engn & Naval Architecture, Split, Croatia Univ Split, Fac Sci, Split, Croatia Inst Rudjer Boskov, Zagreb, Croatia Univ Cyprus, Nicosia, Cyprus Charles Univ Prague, Prague, Czech Republic Egyptian Network High Energy Phys, Acad 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Search for s channel single top quark production in pp collisions at root s=7 and 8 TeV

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