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Measurement of top quark polarization in top-antitop events from proton-proton collisions at √s=7 TeV using the ATLAS detector.
Aad, G; Abajyan, T; Abbott, B; Abdallah, J; Abdel Khalek, S; Abdinov, O; Aben, R; Abi, B; Abolins, M; AbouZeid, O S; Abramowicz, H; Abreu, H; Abulaiti, Y; Acharya, B S; Adamczyk, L; Adams, D L; Addy, T N; Adelman, J; Adomeit, S; Adye, T; Aefsky, S; Agatonovic-Jovin, T; Aguilar-Saavedra, J A; Agustoni, M; Ahlen, S P; Ahmad, A; Ahsan, M; Aielli, G; Åkesson, T P A; Akimoto, G; Akimov, A V; Alam, M A; Albert, J; Albrand, S; Alconada Verzini, M J; Aleksa, M; Aleksandrov, I N; Alessandria, F; Alexa, C; Alexander, G; Alexandre, G; Alexopoulos, T; Alhroob, M; Aliev, M; Alimonti, G; Alio, L; Alison, J; Allbrooke, B M M; Allison, L J; Allport, P P.
Affiliation
  • Aad G; Fakultät für Mathematik und Physik, Albert-Ludwigs-Universität, Freiburg, Germany.
  • Abajyan T; Physikalisches Institut, University of Bonn, Bonn, Germany.
  • Abbott B; Homer L. Dodge Department of Physics and Astronomy, University of Oklahoma, Norman, Oklahoma, USA.
  • Abdallah J; Institut de Física d'Altes Energies and Departament de Física de la Universitat Autònoma de Barcelona, Barcelona, Spain.
  • Abdel Khalek S; LAL, Université Paris-Sud and CNRS/IN2P3, Orsay, France.
  • Abdinov O; Institute of Physics, Azerbaijan Academy of Sciences, Baku, Azerbaijan.
  • Aben R; Nikhef National Institute for Subatomic Physics and University of Amsterdam, Amsterdam, Netherlands.
  • Abi B; Department of Physics, Oklahoma State University, Stillwater, Oklahoma, USA.
  • Abolins M; Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan, USA.
  • AbouZeid OS; Department of Physics, University of Toronto, Toronto, Ontario, Canada.
  • Abramowicz H; Raymond and Beverly Sackler School of Physics and Astronomy, Tel Aviv University, Tel Aviv, Israel.
  • Abreu H; DSM/IRFU (Institut de Recherches sur les Lois Fondamentales de l'Univers), CEA Saclay (Commissariat à l'Energie Atomique et aux Energies Alternatives), Gif-sur-Yvette, France.
  • Abulaiti Y; Department of Physics, Stockholm University, Sweden and The Oskar Klein Centre, Stockholm, Sweden.
  • Acharya BS; INFN Gruppo Collegato di Udine, Italy and ICTP, Trieste, Italy.
  • Adamczyk L; AGH University of Science and Technology, Faculty of Physics and Applied Computer Science, Krakow, Poland.
  • Adams DL; Physics Department, Brookhaven National Laboratory, Upton, New York, USA.
  • Addy TN; Department of Physics, Hampton University, Hampton, Virginia, USA.
  • Adelman J; Department of Physics, Yale University, New Haven, Connecticut, USA.
  • Adomeit S; Fakultät für Physik, Ludwig-Maximilians-Universität München, München, Germany.
  • Adye T; Particle Physics Department, Rutherford Appleton Laboratory, Didcot, United Kingdom.
  • Aefsky S; Department of Physics, Brandeis University, Waltham, Massachusetts, USA.
  • Agatonovic-Jovin T; Vinca Institute of Nuclear Sciences, University of Belgrade, Belgrade, Serbia.
  • Aguilar-Saavedra JA; Departamento de Fisica Teorica y del Cosmos and CAFPE, Universidad de Granada, Granada, Spain.
  • Agustoni M; Albert Einstein Center for Fundamental Physics and Laboratory for High Energy Physics, University of Bern, Bern, Switzerland.
  • Ahlen SP; Department of Physics, Boston University, Boston, Massachusetts, USA.
  • Ahmad A; Departments of Physics & Astronomy and Chemistry, Stony Brook University, Stony Brook, New York, USA.
  • Ahsan M; Physics Department, University of Texas at Dallas, Richardson, Texas, USA.
  • Aielli G; INFN Sezione di Roma Tor Vergata, Italy and Dipartimento di Fisica, Università di Roma Tor Vergata, Roma, Italy.
  • Åkesson TP; Fysiska institutionen, Lunds universitet, Lund, Sweden.
  • Akimoto G; International Center for Elementary Particle Physics and Department of Physics, The University of Tokyo, Tokyo, Japan.
  • Akimov AV; P.N. Lebedev Institute of Physics, Academy of Sciences, Moscow, Russia.
  • Alam MA; Department of Physics, Royal Holloway University of London, Surrey, United Kingdom.
  • Albert J; Department of Physics and Astronomy, University of Victoria, Victoria, British Columbia, Canada.
  • Albrand S; Laboratoire de Physique Subatomique et de Cosmologie, Université Joseph Fourier and CNRS/IN2P3 and Institut National Polytechnique de Grenoble, Grenoble, France.
  • Alconada Verzini MJ; Instituto de Física La Plata, Universidad Nacional de La Plata and CONICET, La Plata, Argentina.
  • Aleksa M; CERN, Geneva, Switzerland.
  • Aleksandrov IN; Joint Institute for Nuclear Research, JINR Dubna, Dubna, Russia.
  • Alessandria F; INFN Sezione di Milano, Italy.
  • Alexa C; National Institute of Physics and Nuclear Engineering, Bucharest, Romania.
  • Alexander G; Raymond and Beverly Sackler School of Physics and Astronomy, Tel Aviv University, Tel Aviv, Israel.
  • Alexandre G; Section de Physique, Université de Genève, Geneva, Switzerland.
  • Alexopoulos T; Physics Department, National Technical University of Athens, Zografou, Greece.
  • Alhroob M; INFN Gruppo Collegato di Udine, Italy and Dipartimento di Chimica, Fisica e Ambiente, Università di Udine, Udine, Italy.
  • Aliev M; Department of Physics, Humboldt University, Berlin, Germany.
  • Alimonti G; INFN Sezione di Milano, Italy.
  • Alio L; CPPM, Aix-Marseille Université and CNRS/IN2P3, Marseille, France.
  • Alison J; Enrico Fermi Institute, University of Chicago, Chicago, Illinois, USA.
  • Allbrooke BM; School of Physics and Astronomy, University of Birmingham, Birmingham, United Kingdom.
  • Allison LJ; Physics Department, Lancaster University, Lancaster, United Kingdom.
  • Allport PP; Oliver Lodge Laboratory, University of Liverpool, Liverpool, United Kingdom.
Phys Rev Lett ; 111(23): 232002, 2013 Dec 06.
Article in En | MEDLINE | ID: mdl-24476258
ABSTRACT
This Letter presents measurements of the polarization of the top quark in top-antitop quark pair events, using 4.7 fb(-1) of proton-proton collision data recorded with the ATLAS detector at the Large Hadron Collider at √s=7 TeV. Final states containing one or two isolated leptons (electrons or muons) and jets are considered. Two measurements of α(ℓ)P, the product of the leptonic spin-analyzing power and the top quark polarization, are performed assuming that the polarization is introduced by either a CP conserving or a maximally CP violating production process. The measurements obtained, α(ℓ)P(CPC)=-0.035±0.014(stat)±0.037(syst) and α(ℓ)P(CPV)=0.020±0.016(stat)(-0.017)(+0.013)(syst), are in good agreement with the standard model prediction of negligible top quark polarization.
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Collection: 01-internacional Database: MEDLINE Type of study: Prognostic_studies Language: En Journal: Phys Rev Lett Year: 2013 Document type: Article Affiliation country: Alemania
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Collection: 01-internacional Database: MEDLINE Type of study: Prognostic_studies Language: En Journal: Phys Rev Lett Year: 2013 Document type: Article Affiliation country: Alemania