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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 Sci Res & Technol Arab Republ Egypt, Cairo, Egypt
NICPB, Tallinn, Estonia
Univ Helsinki, Dept Phys, Helsinki, Finland
Helsinki Inst Phys, Helsinki, Finland
Lappeenranta Univ Technol, Lappeenranta, Finland
CEA Saclay, DSM IRFU, Gif Sur Yvette, France
Ecole Polytech, CNRS IN2P3, Lab Leprince Ringuet, Palaiseau, France
Univ Haute Alsace Mulhouse, Univ Strasbourg, CNRS IN2P3, Inst Pluridisciplinaire Hubert Curien, Strasbourg, France
Inst Natl Phys Nucl & Phys Particules, CNRS IN2P3, Ctr Calcul, Villeurbanne, France
Univ Lyon 1, CNRS IN2P3, Inst Phys Nucl Lyon, Villeurbanne, France
Georgian Tech Univ, Tbilisi, Rep of Georgia
Tbilisi State Univ, Tbilisi, Rep of Georgia
Rhein Westfal TH Aachen, Inst Phys 1, Aachen, Germany
Rhein Westfal TH Aachen, Phys Inst A 3, Aachen, Germany
Rhein Westfal TH Aachen, Phys Inst B 3, Aachen, Germany
DESY, Hamburg, Germany
Univ Hamburg, Hamburg, Germany
Inst Expt Kernphys, Karlsruhe, Germany
NCSR Demokritos, INPP, Aghia Paraskevi, Paraskevi, Greece
Univ Athens, Athens, Greece
Univ Ioannina, Ioannina, Greece
Wigner Res Ctr Phys, Budapest, Hungary
Inst Nucl Res ATOMKI, Debrecen, Hungary
Univ Debrecen, Debrecen, Hungary
Natl Inst Sci Educ & Res, Bhubaneswar, Orissa, India
Panjab Univ, Chandigarh, India
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Saha Inst Nucl Phys, Kolkata, India
Bhabha Atom Res Ctr, Bombay, Maharashtra, India
Tata Inst Fundamental Res, Bombay, Maharashtra, India
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Inst Res Fundamental Sci IPM, Tehran, Iran
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Ist Nazl Fis Nucl, Sez Bari, Bari, Italy
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Politecn Bari, Bari, Italy
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Ist Nazl Fis Nucl, Sez Catania, Catania, Italy
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Kangwon Natl Univ, Chunchon, South Korea
Kyungpook Natl Univ, Daegu, South Korea
Chonbuk Natl Univ, Jeonju, South Korea
Chonnam Natl Univ, Inst Universe & Elementary Particles, Kwangju, South Korea
Korea Univ, Seoul, South Korea
Seoul Natl Univ, Seoul, South Korea
Univ Seoul, Seoul, South Korea
Sungkyunkwan Univ, Suwon, South Korea
Vilnius Univ, Vilnius, Lithuania
Univ Malaya, Natl Ctr Particle Phys, Kuala Lumpur, Malaysia
IPN, Ctr Invest & Estudios Avanzados, Mexico City, DF, Mexico
Univ Iberoamer, Mexico City, DF, Mexico
Benemerita Univ Autonoma Puebla, Puebla, Mexico
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Univ Canterbury, Christchurch, New Zealand
Quaid I Azam Univ, Natl Ctr Phys, Islamabad, Pakistan
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Lab Instrumentacao & Fis Expt Particulas, Lisbon, Portugal
Joint Inst Nucl Res, Dubna, Russia
Petersburg Nucl Phys Inst, St Petersburg, Russia
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Inst Theoret & Expt Phys, Moscow, Russia
Natl Res Nucl Univ, Moscow Engn Phys Inst MEPhI, Moscow, Russia
PN Lebedev Phys Inst, Moscow, Russia
Lomonosov Moscow State Univ, Skobeltsyn Inst Nucl Phys, Moscow, Russia
State Res Ctr Russian Federat, Inst High Energy Phys, Protvino, Russia
Univ Belgrade, Fac Phys, Belgrade, Serbia
Vinca Inst Nucl Sci, Belgrade, Serbia
Ctr Invest Energet Medioambientales & Tecnol CIEM, Madrid, Spain
Univ Autonoma Madrid, Madrid, Spain
Univ Oviedo, Oviedo, Spain
Univ Cantabria, CSIC, Inst Fis Cantabria IFCA, Santander, Spain
European Org Nucl Res, CERN, Geneva, Switzerland
Paul Scherrer Inst, Villigen, Switzerland
Swiss Fed Inst Technol, Inst Particle Phys, Zurich, Switzerland
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Chulalongkorn Univ, Fac Sci, Dept Phys, Bangkok, Thailand
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