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Observation of the γγ→ττ Process in Pb+Pb Collisions and Constraints on the τ-Lepton Anomalous Magnetic Moment with the ATLAS Detector.
Aad, G; Abbott, B; Abbott, D C; Abeling, K; Abidi, S H; Aboulhorma, A; Abramowicz, H; Abreu, H; Abulaiti, Y; Abusleme Hoffman, A C; Acharya, B S; Achkar, B; Adam, L; Adam Bourdarios, C; Adamczyk, L; Adamek, L; Addepalli, S V; Adelman, J; Adiguzel, A; Adorni, S; Adye, T; Affolder, A A; Afik, Y; Agaras, M N; Agarwala, J; Aggarwal, A; Agheorghiesei, C; Aguilar-Saavedra, J A; Ahmad, A; Ahmadov, F; Ahmed, W S; Ahuja, S; Ai, X; Aielli, G; Aizenberg, I; Akbiyik, M; Åkesson, T P A; Akimov, A V; Al Khoury, K; Alberghi, G L; Albert, J; Albicocco, P; Alconada Verzini, M J; Alderweireldt, S; Aleksa, M; Aleksandrov, I N; Alexa, C; Alexopoulos, T; Alfonsi, A; Alfonsi, F.
Afiliação
  • Aad G; CPPM, Aix-Marseille Université, CNRS/IN2P3, Marseille, France.
  • Abbott B; Homer L. Dodge Department of Physics and Astronomy, University of Oklahoma, Norman, Oklahoma, USA.
  • Abbott DC; Department of Physics, University of Massachusetts, Amherst, Massachusetts, USA.
  • Abeling K; II. Physikalisches Institut, Georg-August-Universität Göttingen, Göttingen, Germany.
  • Abidi SH; Physics Department, Brookhaven National Laboratory, Upton, New York, USA.
  • Aboulhorma A; Faculté des sciences, Université Mohammed V, Rabat, Morocco.
  • Abramowicz H; Raymond and Beverly Sackler School of Physics and Astronomy, Tel Aviv University, Tel Aviv, Israel.
  • Abreu H; Department of Physics, Technion, Israel Institute of Technology, Haifa, Israel.
  • Abulaiti Y; Department of Physics, New York University, New York, New York, USA.
  • Abusleme Hoffman AC; Departamento de Física, Pontificia Universidad Católica de Chile, Santiago, Chile.
  • Acharya BS; INFN Gruppo Collegato di Udine, Sezione di Trieste, Udine, Italy.
  • Achkar B; ICTP, Trieste, Italy.
  • Adam L; II. Physikalisches Institut, Georg-August-Universität Göttingen, Göttingen, Germany.
  • Adam Bourdarios C; Institut für Physik, Universität Mainz, Mainz, Germany.
  • Adamczyk L; LAPP, Univ. Savoie Mont Blanc, CNRS/IN2P3, Annecy, France.
  • Adamek L; AGH University of Science and Technology, Faculty of Physics and Applied Computer Science, Krakow, Poland.
  • Addepalli SV; Department of Physics, University of Toronto, Toronto ON, Canada.
  • Adelman J; Department of Physics, Brandeis University, Waltham, Massachusetts, USA.
  • Adiguzel A; Department of Physics, Northern Illinois University, DeKalb, Illinois, USA.
  • Adorni S; Department of Physics, Istanbul University, Istanbul, Türkiye.
  • Adye T; Département de Physique Nucléaire et Corpusculaire, Université de Genève, Genève, Switzerland.
  • Affolder AA; Particle Physics Department, Rutherford Appleton Laboratory, Didcot, United Kingdom.
  • Afik Y; Santa Cruz Institute for Particle Physics, University of California, Santa Cruz, California, USA.
  • Agaras MN; CERN, Geneva, Switzerland.
  • Agarwala J; Institut de Física d'Altes Energies (IFAE), Barcelona Institute of Science and Technology, Barcelona, Spain.
  • Aggarwal A; INFN Sezione di Pavia, Italy.
  • Agheorghiesei C; Dipartimento di Fisica, Università di Pavia, Pavia, Italy.
  • Aguilar-Saavedra JA; Institut für Physik, Universität Mainz, Mainz, Germany.
  • Ahmad A; Department of Physics, Alexandru Ioan Cuza University of Iasi, Iasi, Romania.
  • Ahmadov F; Departamento de Física Teórica y del Cosmos, Universidad de Granada, Granada (Spain), Spain.
  • Ahmed WS; CERN, Geneva, Switzerland.
  • Ahuja S; Affiliated with an international laboratory covered by a cooperation agreement with CERN.
  • Ai X; Department of Physics, McGill University, Montreal QC, Canada.
  • Aielli G; Department of Physics, Royal Holloway University of London, Egham, United Kingdom.
  • Aizenberg I; Deutsches Elektronen-Synchrotron DESY, Hamburg and Zeuthen, Germany.
  • Akbiyik M; INFN Sezione di Roma Tor Vergata, Italy.
  • Åkesson TPA; Dipartimento di Fisica, Università di Roma Tor Vergata, Roma, Italy.
  • Akimov AV; Department of Particle Physics and Astrophysics, Weizmann Institute of Science, Rehovot, Israel.
  • Al Khoury K; Institut für Physik, Universität Mainz, Mainz, Germany.
  • Alberghi GL; Fysiska institutionen, Lunds universitet, Lund, Sweden.
  • Albert J; Affiliated with an institute covered by a cooperation agreement with CERN.
  • Albicocco P; Nevis Laboratory, Columbia University, Irvington New York, USA.
  • Alconada Verzini MJ; INFN Sezione di Bologna, Italy.
  • Alderweireldt S; Department of Physics and Astronomy, University of Victoria, Victoria BC, Canada.
  • Aleksa M; INFN e Laboratori Nazionali di Frascati, Frascati, Italy.
  • Aleksandrov IN; Instituto de Física La Plata, Universidad Nacional de La Plata and CONICET, La Plata, Argentina.
  • Alexa C; SUPA-School of Physics and Astronomy, University of Edinburgh, Edinburgh, United Kingdom.
  • Alexopoulos T; CERN, Geneva, Switzerland.
  • Alfonsi A; Affiliated with an international laboratory covered by a cooperation agreement with CERN.
  • Alfonsi F; Horia Hulubei National Institute of Physics and Nuclear Engineering, Bucharest, Romania.
Phys Rev Lett ; 131(15): 151802, 2023 Oct 13.
Article em En | MEDLINE | ID: mdl-37897746
ABSTRACT
This Letter reports the observation of τ-lepton-pair production in ultraperipheral lead-lead collisions Pb+Pb→Pb(γγ→ττ)Pb and constraints on the τ-lepton anomalous magnetic moment a_{τ}. The dataset corresponds to an integrated luminosity of 1.44 nb^{-1} of LHC Pb+Pb collisions at sqrt[s_{NN}]=5.02 TeV recorded by the ATLAS experiment in 2018. Selected events contain one muon from a τ-lepton decay, an electron or charged-particle track(s) from the other τ-lepton decay, little additional central-detector activity, and no forward neutrons. The γγ→ττ process is observed in Pb+Pb collisions with a significance exceeding 5 standard deviations and a signal strength of µ_{ττ}=1.03_{-0.05}^{+0.06} assuming the standard model value for a_{τ}. To measure a_{τ}, a template fit to the muon transverse-momentum distribution from τ-lepton candidates is performed, using a dimuon (γγ→µµ) control sample to constrain systematic uncertainties. The observed 95% confidence-level interval for a_{τ} is -0.057
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Texto completo: 1 Bases de dados: MEDLINE Idioma: En Revista: Phys Rev Lett Ano de publicação: 2023 Tipo de documento: Article País de afiliação: França
Texto completo
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XML
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Texto completo: 1 Bases de dados: MEDLINE Idioma: En Revista: Phys Rev Lett Ano de publicação: 2023 Tipo de documento: Article País de afiliação: França