Published October 24, 2013
| Version Published + Submitted
Journal Article
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Measurement of the W-boson helicity in top-quark decays from tt production in lepton+jets events in pp collisions at √s = 7 TeV
Abstract
The W-boson helicity fractions in top-quark decays are measured with tt events in the lepton+jets final state, using proton-proton collisions at a centre-of-mass energy of 7 TeV, collected in 2011 with the CMS detector at the LHC. The data sample corresponds to an integrated luminosity of 5.0 fb^(−1). The measured fractions of longitudinal, left-, and right-handed helicity are F_0 = 0.682 ± 0.030 (stat.) ± 0.033 (syst.), F_L = 0.310 ± 0.022 (stat.) ± 0.022 (syst.), and F_R = 0.008 ± 0.012 (stat.) ± 0.014 (syst.), consistent with the standard model predictions. The measured fractions are used to probe the existence of anomalous Wtb couplings. Exclusion limits on the real components of the anomalous couplings g_L , g_R are also derived.
Additional Information
© 2013 CERN for the benefit of the CMS collaboration. Published for SISSA by Springer. Received: August 18, 2013. Accepted: September 16, 2013. Published: October 24, 2013. This article is distributed under the terms of the Creative Commons Attribution License which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited. We congratulate our colleagues in the CERN accelerator departments for the excellent performance of the LHC and thank the technical and administrative staffs at CERN and at other CMS institutes for their contributions to the success of the CMS effort. In addition, we gratefully acknowledge the computing centres and personnel of the Worldwide LHC Computing Grid for delivering so effectively the computing infrastructure essential to our analyses. Finally, we acknowledge the enduring support for the construction and operation of the LHC and the CMS detector provided by the following funding agencies: the Austrian Federal Ministry of Science and Research and the Austrian Science Fund; the Belgian 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 Ministry of Education and Research, Recurrent financing contract SF0690030s09 and European Regional Development Fund, Estonia; 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'Énergie 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, Republic of 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 Ministry of Science and Higher Education and the National Science Centre, Poland; the Fundação para a Ciência e a Tecnologia, Portugal; JINR, Dubna; the Ministry of Education and Science of the Russian Federation, the Federal Agency of Atomic Energy of the Russian Federation, Russian Academy of Sciences, and the Russian Foundation for Basic Research; the Ministry of Education, Science and Technological Development of Serbia; the Secretaría de Estado de Investigaciόn, Desarrollo 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 Thailand Center of Excellence in Physics, the Institute for the Promotion of Teaching Science and Technology of Thailand, Special Task Force for Activating Research and the National Science and Technology Development Agency of Thailand; the Scientific and Technical Research Council of Turkey, and Turkish Atomic Energy Authority; the Science and Technology Facilities Council, U.K.; 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 and EPLANET (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 à la Recherche dans l'Industrie et dans l'Agriculture (FRIA-Belgium); the Agentschap voor Innovatie door Wetenschap en Technologie (IWT-Belgium); the Ministry of Education, Youth and Sports (MEYS) of Czech Republic; the Council of Science and Industrial Research, India; the Compagnia di San Paolo (Torino); the HOMING PLUS programme of Foundation for Polish Science, cofinanced by EU, Regional Development Fund; and the Thalis and Aristeia programmes cofinanced by EU-ESF and the Greek NSRF.Attached Files
Published - art_10.1007_JHEP10_2013_167.pdf
Submitted - 1308.3879v1.pdf
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Additional details
Identifiers
- Eprint ID
- 42792
- Resolver ID
- CaltechAUTHORS:20131203-100119947
Related works
- Describes
- http://arxiv.org/abs/1308.3879 (URL)
Funding
- Austrian Federal Ministry of Science and Research
- Austrian Science Fund
- Belgian Fonds de la Recherche Scientifique and Fonds voor Wetenschappelijk Orderzoek
- 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
- Ministry of Education and Research
- SF0690030s09
- European Regional Development Fund, Estonia
- 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, and Commissariat à l'Énergie Atomique et aux Énergies Alternatives / CEA, France
- Bundesministerium für Bildung und Forschung
- Deutsche Forschungsgemeinschaft
- Helmholtz-Gemeinschaft Deutscher Forschungszentren (Germany)
- General Secretariat for Research and Technology (Greece)
- National Scientific Research Foundation and National Office for Research and Technology, Hungary
- Department of Atomic Energy and Department of Science and Technology of 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, Republic of Korea
- Lithuanian Academy of Sciences
- CINVESTAV (Mexico)
- CONACYT (Mexico)
- SEP (Mexico)
- UASLP-FAI (Mexico)
- Ministry of Science and Innovation, New Zealand
- Pakistan Atomic Energy Commission
- Ministry of Science and Higher Education and the National Science Centre, Poland
- Fundação para a Ciência e a Tecnologia, Portugal
- JINR
- Dubna
- Ministry of Education and Science of the Russian Federation
- Russian Academy of Sciences
- Russian Foundation for Basic Research
- Ministry of Education Science and Technological Development of Serbia
- Secretaría de Estado de Investigaciόn, Desarrollo e Innovaciόn and Programa Consolider-Ingenio 2010, 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 and the 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
- Department of Energy (DOE)
- NSF
- Marie-Curie programme and the European Research Council and EPLANET (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)
- Ministry of Education, Youth and Sports (MEYS) of Czech Republic
- Council of Scientific and Industrial Research of India
- Compagnia di San Paolo (Torino)
- HOMING PLUS programme of Foundation for Polish Science
- Regional Development Fund
- Thalis and Aristeia programmes cofinanced by EU-ESF
- Greek NSRF
Dates
- Created
-
2013-12-03Created from EPrint's datestamp field
- Updated
-
2021-11-10Created from EPrint's last_modified field