Measurement of the weak mixing angle with the Drell-Yan process in proton-proton collisions at the LHC
Abstract
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 √s=7 TeV collected by the CMS experiment at the LHC, corresponding to an integrated luminosity of 1.1 fb^(-1). From the dominant uu̅ , dd̅ → γ^*/Z → μ^-μ^+ process, the effective weak mixing angle parameter is measured to be sin^2θ_(eff)=0.2287±0.0020 (stat.)±0.0025 (syst.). This result is consistent with measurements from other processes, as expected within the standard model.
Additional Information
© 2011 CERN, for the CMS Collaboration. Published by the American Physical Society under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Received 14 October 2011; published 8 December 2011. We would like to thank Kirill Melnikov and Alessandro Vicini for useful discussions of NLO QCD and EWK effects. We wish to congratulate our colleagues in the CERN accelerator departments for the excellent performance of the LHC machine. We thank the technical and administrative staff at CERN and other CMS institutes. This work was supported by the Austrian Federal Ministry of Science and Research; the Belgium Fonds de la Recherche Scientifique, and Fonds voor Wetenschappelijk Onderzoek; the Brazilian Funding Agencies (CNPq, CAPES, FAPERJ, and FAPESP); the Bulgarian Ministry of Education and Science; CERN; the Chinese Academy of Sciences, Ministry of Science and Technology, and National Natural Science Foundation of China; the Colombian Funding Agency (COLCIENCIAS); the Croatian Ministry of Science, Education and Sport; the Research Promotion Foundation, Cyprus; the Estonian Academy of Sciences and NICPB; the Academy of Finland, Finnish Ministry of Education and Culture, and Helsinki Institute of Physics; the Institut National de Physique Nucléaire et de Physique des Particules/CNRS, and Commissariat à l'É nergie Atomique et aux Énergies Alternatives/CEA, France; the Bundesministerium für Bildung und Forschung, Deutsche Forschungsgemeinschaft, and Helmholtz-Gemeinschaft Deutscher Forschungszentren, Germany; the General Secretariat for Research and Technology, Greece; the National Scientific Research Foundation, and National Office for Research and Technology, Hungary; the Department of Atomic Energy and the Department of Science and Technology, India; the Institute for Studies in Theoretical Physics and Mathematics, Iran; the Science Foundation, Ireland; the Istituto Nazionale di Fisica Nucleare, Italy; the Korean Ministry of Education, Science and Technology and the World Class University program of NRF, Korea; the Lithuanian Academy of Sciences; the Mexican Funding Agencies (CINVESTAV, CONACYT, SEP, and UASLP-FAI); the Ministry of Science and Innovation, New Zealand; the Pakistan Atomic Energy Commission; the State Commission for Scientific Research, Poland; the Fundação para a Ciência e a Tecnologia, Portugal; JINR (Armenia, Belarus, Georgia, Ukraine, Uzbekistan); the Ministry of Science and Technologies of the Russian Federation, the Russian Ministry of Atomic Energy and the Russian Foundation for Basic Research; the Ministry of Science and Technological Development of Serbia; the Ministerio de Ciencia e Innovaciόn, and Programa Consolider-Ingenio 2010, Spain; the Swiss Funding Agencies (ETH Board, ETH Zurich, PSI, SNF, UniZH, Canton Zurich, and SER); the National Science Council, Taipei; the Scientific and Technical Research Council of Turkey, and Turkish Atomic Energy Authority; the Science and Technology Facilities Council, UK; the US Department of Energy, and the US National Science Foundation. Individuals have received support from the Marie-Curie programme and the European Research Council (European Union); the Leventis Foundation; the A. P. Sloan Foundation; the Alexander von Humboldt Foundation; the Belgian Federal Science Policy Office; the Fonds pour la Formation a` la Recherche dans l'Industrie et dans l'Agriculture (FRIA-Belgium); the Agentschap voor Innovatie door Wetenschap en Technologie (IWT-Belgium); and the Council of Science and Industrial Research, India.Attached Files
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Additional details
- Eprint ID
- 28808
- Resolver ID
- CaltechAUTHORS:20120117-110940745
- Austrian Federal Ministry of Science and Research
- Belgium Fonds de la Recherche Scientifique, and Fonds voor Wetenschappelijk Onderzoek
- CNPq (Brazil)
- CAPES (Brazil)
- FAPERJ (Brazil)
- FAPESP (Brazil)
- Bulgarian Ministry of Education and Science
- CERN
- Chinese Academy of Sciences
- Ministry of Science and Technology
- National Natural Science Foundation of China
- COLCIENCIAS (Colombia)
- 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 Nucléaire et de Physique des Particules/CNRS
- Commissariat à l'Énergie Atomique et aux Énergies Alternatives (CEA) France
- Bundesministerium für Bildung und Forschung and 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 and the World Class University Program of NRF (KOREA)
- Lithuanian Academy of Sciences
- CINVESTAV (Mexico)
- SEP and UASLP-FAI (Mexico)
- Ministry of Science and Innovation, New Zealand
- Pakistan Atomic Energy Commission
- State Commission for Scientific Research (Poland)
- Fundação para a Ciência e a Tecnologia (Portugal)
- JINR (Armenia, Belarus, Georgia, Ukraine, Uzbekistan)
- Ministry of Science and Technologies of the Russian Federation
- Russian Ministry of Atomic Energy and the Russian Foundation for Basic Research
- Ministry of Science and Technological Development of Serbia
- Ministerio de Ciencia e Innovaciόn, and Programa Consolider-Ingenio 2010, Spain
- ETH Board
- ETH Zurich
- PSI
- SNF
- UniZH
- Canton Zurich and SER
- National Science Council (Taipei)
- Scientific and Technical Research Council of Turkey
- Turkish Atomic Energy Authority
- Science and Technology Facilities Council (UK)
- Department of Energy (DOE)
- NSF
- Marie Curie program and the European Research Council (European Union)
- Leventis Foundation
- A.P. Sloan Foundation
- Alexander von Humboldt Foundation
- Belgian Federal Science Policy Office
- Fonds pour la Formation à la Recherche dans l'índustrie et dans l'Ágriculture (FRIA-Belgium)
- Agentschap voor Innovatie door Wetenschap en Technologie (IWT-Belgium)
- Council of Science and Industrial Research, India
- Created
-
2012-01-17Created from EPrint's datestamp field
- Updated
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2021-11-09Created from EPrint's last_modified field
- Caltech groups
- CMS@Caltech