Measurement of associated W plus charm production in pp collisions at root s=7 TeV
CMS Collaboration (ukupan broj autora: 2225)
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Measurements are presented of the associated production of a W boson and a charm-quark jet (W + c) in pp collisions at a center-of-mass energy of 7 TeV. The analysis is conducted with a data sample corresponding to a total integrated luminosity of 5 fb(-1), collected by the CMS detector at the LHC. W boson candidates are identified by their decay into a charged lepton (muon or electron) and a neutrino. The W + c measurements are performed for charm-quark jets in the kinematic region p(T)(jet) GT 25 GeV, vertical bar eta(jet)vertical bar LT 2.5, for two different thresholds for the transverse momentum of the lepton from the W-boson decay, and in the pseudorapidity range eta(l) LT 2.1. Hadronic and inclusive semileptonic decays of charm hadrons are used to measure the following total cross sections: sigma(pp - GT W + c + X) x B (W - GT lv) = 107.7 +/- 3.3 (stat.) +/- 6.9 (syst.) pb (p(T)(l) GT 25 GeV) and sigma (pp - GT W + c + X) x B (W - GT lv) = 84.1 +/- 2.0 (stat.) +/- 4.9 (syst.) pb... (p(T)(l) GT 35 GeV), and the cross section ratios sigma(pp - GT W+ + (c) over bar + X)/sigma(pp - GT W- + c + X) = 0.954 +/- 0.025 (stat.) +/- 0.004 (syst.) (p(T)(l) GT 25 GeV) and sigma(pp - GT W+ + (c) over bar + X)/sigma(pp - GT W- + c + X) = 0.938 +/- 0.019 (stat.) +/- 0.006 (syst.) (p(T)(l) GT 35 GeV). Cross sections and cross section ratios are also measured differentially with respect to the absolute value of the pseudorapidity of the lepton from the W-boson decay. These are the first measurements from the LHC directly sensitive to the strange quark and antiquark content of the proton. Results are compared with theoretical predictions and are consistent with the predictions based on global fits of parton distribution functions.
Source:Journal of High Energy Physics, 2014, 2
- Austrian Federal Ministry of Science and Research, Austrian Science Fund, Belgian Fonds de la Recherche Scientifique, Fonds voor Wetenschappelijk Onderzoek, CNPq, CAPES, FAPERJ, FAPESP, Bulgarian Ministry of Education and Science, CERN, Chinese Academy of Sciences, Ministry of Science and Technology, National Natural Science Foundation of China, Colombian Funding Agency (COLCIENCIAS), Croatian Ministry of Science, Education and Sport, Research Promotion Foundation, Cyprus, Ministry of Education and Research [SF0690030s09], European Regional Development Fund, Estonia, Academy of Finland, Finnish Ministry of Education and Culture, Helsinki Institute of Physics, Institut National de Physique Nucleaire et de Physique des Particules / CNRS, France, Commissariat a lEnergie Atomique et aux Energies Alternatives / CEA, France, Bundesministerium fur Bildung und Forschung, Germany, Deutsche Forschungsgemeinschaft, Germany, Helmholtz-Gemeinschaft Deutscher Forschungszentren, Germany, General Secretariat for Research and Technology, Greece, National Scientific Research Foundation, Hungary, National Office for Research and Technology, Hungary, Department of Atomic Energy, India, Department of Science and Technology, India, Institute for Studies in Theoretical Physics and Mathematics, Iran, Science Foundation, Ireland, Istituto Nazionale di Fisica Nucleare, Italy, Korean Ministry of Education, Science and Technology, Republic of Korea, World Class University program of NRF, Republic of Korea, Lithuanian Academy of Sciences, CINVESTAV, CONACYT, SEP, UASLP-FAI, Ministry of Business, Innovation and Employment, New Zealand, Pakistan Atomic Energy Commission, Ministry of Science and Higher Education, Poland, National Science Centre, Poland, Fundacao para a Ciencia e a Tecnologia, Portugal, JINR, Dubna, Ministry of Education and Science of the Russian Federation, Federal Agency of Atomic Energy of the Russian Federation, Russian Academy of Sciences, Russian Foundation for Basic Research, Ministry of Education, Science and Technological Development of Serbia, Secretaria de Estado de Investigacion, Spain, Desarrollo e Innovacion and Programa Consolider-Ingenio, Spain, ETH Board, ETH Zurich, PSI, SNF, UniZH, Canton Zurich, SER, National Science Council, Taipei, Thailand Center of Excellence in Physics, Institute for the Promotion of Teaching Science and Technology of Thailand, Special Task Force for Activating Research, National Science and Technology Development Agency of Thailand, Scientific and Technical Research Council of Turkey, Turkish Atomic Energy Authority, Science and Technology Facilities Council, U.K., US Department of Energy, US National Science Foundation, 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 lIndustrie et dans lAgriculture (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 - EU, Regional Development Fund, Thalis programme - EU-ESF, Aristeia programme - EU-ESF, Greek NSRF