Measurement of the weak mixing angle with the Drell-Yan process in proton-proton collisions at the LHC
CMS Collaboration (ukupan broj autora: 2255)
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A multivariate likelihood method to measure electroweak couplings with the Drell-Yan process at the LHC is presented. The process is described by the dilepton rapidity, invariant mass, and decay angle distributions. The decay angle ambiguity due to the unknown assignment of the scattered constituent quark and antiquark to the two protons in a collision is resolved statistically using correlations between the observables. The method is applied to a sample of dimuon events from proton-proton collisions at root s = 7 TeV collected by the CMS experiment at the LHC, corresponding to an integrated luminosity of 1.1 fb(-1). From the dominant u (u) over bar, d (d) over bar - GT gamma*/Z - GT mu(-)mu(+) process, the effective weak mixing angle parameter is measured to be sin(2)theta(eff) = 0.2287 +/- 0.0020 (stat.) +/- 0.0025 (syst.) This result is consistent with measurements from other processes, as expected within the standard model.
Извор:Physical Review D, 2011, 84, 11
- Austrian Federal Ministry of Science and Research, Belgium Fonds de la Recherche Scientifique, Brazilian Funding Agency (CNPq), Brazilian Funding Agency (CAPES), Brazilian Funding Agency (FAPERJ), Brazilian Funding Agency (FAPESP), Bulgarian Ministry of Education and Science, Chinese Academy of Sciences, Colombian Funding Agency (COLCIENCIAS), Croatian Ministry of Science, Education and Sport, Research Promotion Foundation, Cyprus, Estonian Academy of Sciences and NICPB, Academy of Finland, Finnish Ministry of Education and Culture, and Helsinki Institute of Physics, Institut National de Physique Nucleaire et de Physique des Particules/CNRS, Commissariat a lEnergie Atomique et aux Energies Alternatives/CEA, France, Bundesministerium fur Bildung und Forschung, Deutsche Forschungsgemeinschaft, Helmholtz-Gemeinschaft Deutscher Forschungszentren, Germany, General Secretariat for Research and Technology, Greece, National Scientific Research Foundation, National Office for Research and Technology, Hungary, Department of Atomic Energy, 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, NRF, Korea, Lithuanian Academy of Sciences, Mexican Funding Agency (CINVESTAV), Mexican Funding Agency (CONACYT), Mexican Funding Agency (SEP), Mexican Funding Agency (UASLP-FAI), Ministry of Science and Innovation, New Zealand, Pakistan Atomic Energy Commission, State Commission for Scientific Research, Poland, Fundacao para a Ciencia e a Tecnologia, Portugal, JINR (Armenia, Belarus, Georgia, Ukraine, Uzbekistan), Ministry of Science and Technologies of the Russian Federation, Russian Ministry of Atomic Energy, Russian Foundation for Basic Research, Ministry of Science and Technological Development of Serbia, Ministerio de Ciencia e Innovacion, Programa Consolider-Ingenio 2010, Spain, Swiss Funding Agency (ETH Board), Swiss Funding Agency (ETH Zurich), Swiss Funding Agency (PSI), Swiss Funding Agency (SNF), Swiss Funding Agency (UniZH), Swiss Funding Agency (Canton Zurich), Swiss Funding Agency (SER), National Science Council, Taipei, Scientific and Technical Research Council of Turkey, Turkish Atomic Energy Authority, Science and Technology Facilities Council, UK, US Department of Energy, US National Science Foundation, Marie-Curie programme, European Research Council (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), Council of Science and Industrial Research, India, Fonds voor Wetenschappelijk Onderzoek, Ministry of Science and Technology, National Natural Science Foundation of China, CERN
ISSN: 2470-0010 (print); 2470-0029 (electronic)