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Observation of Light-by-Light Scattering in Ultraperipheral Pb+Pb Collisions with the ATLAS Detector.
Aad, G; Abbott, B; Abbott, D C; Abdinov, O; Abed Abud, A; Abeling, K; Abhayasinghe, D K; Abidi, S H; AbouZeid, O S; Abraham, N L; Abramowicz, H; Abreu, H; Abulaiti, Y; Acharya, B S; Achkar, B; Adachi, S; Adam, L; Adam Bourdarios, C; Adamczyk, L; Adamek, L; Adelman, J; Adersberger, M; Adiguzel, A; Adorni, S; Adye, T; Affolder, A A; Afik, Y; Agapopoulou, C; Agaras, M N; Aggarwal, A; Agheorghiesei, C; Aguilar-Saavedra, J A; Ahmadov, F; Ahmed, W S; Ai, X; Aielli, G; Akatsuka, S; Åkesson, T P A; Akilli, E; Akimov, A V; Al Khoury, K; Alberghi, G L; Albert, J; Alconada Verzini, M J; Alderweireldt, S; Aleksa, M; Aleksandrov, I N; Alexa, C; Alexandre, D; Alexopoulos, T.
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.
  • Abdinov O; Institute of Physics, Azerbaijan Academy of Sciences, Baku, Azerbaijan.
  • Abed Abud A; INFN Sezione di Pavia, Italy.
  • Abeling K; Dipartimento di Fisica, Università di Pavia, Pavia, Italy.
  • Abhayasinghe DK; II. Physikalisches Institut, Georg-August-Universität Göttingen, Göttingen, Germany.
  • Abidi SH; Department of Physics, Royal Holloway University of London, Egham, United Kingdom.
  • AbouZeid OS; Department of Physics, University of Toronto, Toronto, Ontario, Canada.
  • Abraham NL; Niels Bohr Institute, University of Copenhagen, Copenhagen, Denmark.
  • Abramowicz H; Department of Physics and Astronomy, University of Sussex, Brighton, United Kingdom.
  • Abreu H; Raymond and Beverly Sackler School of Physics and Astronomy, Tel Aviv University, Tel Aviv, Israel.
  • Abulaiti Y; Department of Physics, Technion, Israel Institute of Technology, Haifa, Israel.
  • Acharya BS; High Energy Physics Division, Argonne National Laboratory, Argonne, Illinois, USA.
  • Achkar B; INFN Gruppo Collegato di Udine, Sezione di Trieste, Udine, Italy.
  • Adachi S; ICTP, Trieste, Italy.
  • Adam L; II. Physikalisches Institut, Georg-August-Universität Göttingen, Göttingen, Germany.
  • Adam Bourdarios C; International Center for Elementary Particle Physics and Department of Physics, University of Tokyo, Tokyo, Japan.
  • Adamczyk L; Institut für Physik, Universität Mainz, Mainz, Germany.
  • Adamek L; LAL, Université Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, Orsay, France.
  • Adelman J; AGH University of Science and Technology, Faculty of Physics and Applied Computer Science, Krakow, Poland.
  • Adersberger M; Department of Physics, University of Toronto, Toronto, Ontario, Canada.
  • Adiguzel A; Department of Physics, Northern Illinois University, DeKalb, Illinois, USA.
  • Adorni S; Fakultät für Physik, Ludwig-Maximilians-Universität München, München, Germany.
  • Adye T; Department of Physics, Bogazici University, Istanbul, Turkey.
  • Affolder AA; Département de Physique Nucléaire et Corpusculaire, Université de Genève, Genève, Switzerland.
  • Afik Y; Particle Physics Department, Rutherford Appleton Laboratory, Didcot, United Kingdom.
  • Agapopoulou C; Santa Cruz Institute for Particle Physics, University of California Santa Cruz, Santa Cruz, California, USA.
  • Agaras MN; Department of Physics, Technion, Israel Institute of Technology, Haifa, Israel.
  • Aggarwal A; LAL, Université Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, Orsay, France.
  • Agheorghiesei C; LPC, Université Clermont Auvergne, CNRS/IN2P3, Clermont-Ferrand, France.
  • Aguilar-Saavedra JA; Institute for Mathematics, Astrophysics and Particle Physics, Radboud University Nijmegen/Nikhef, Nijmegen, Netherlands.
  • Ahmadov F; Department of Physics, Alexandru Ioan Cuza University of Iasi, Iasi, Romania.
  • Ahmed WS; Laboratório de Instrumentação e Física Experimental de Partículas-LIP, Portugal.
  • Ai X; Universidad de Granada, Granada (Spain), Spain.
  • Aielli G; Joint Institute for Nuclear Research, Dubna, Russia.
  • Akatsuka S; Department of Physics, McGill University, Montreal, Quebec, Canada.
  • Åkesson TPA; Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China.
  • Akilli E; INFN Sezione di Roma Tor Vergata, Italy.
  • Akimov AV; Dipartimento di Fisica, Università di Roma Tor Vergata, Roma, Italy.
  • Al Khoury K; Faculty of Science, Kyoto University, Kyoto, Japan.
  • Alberghi GL; Fysiska institutionen, Lunds universitet, Lund, Sweden.
  • Albert J; Département de Physique Nucléaire et Corpusculaire, Université de Genève, Genève, Switzerland.
  • Alconada Verzini MJ; P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow, Russia.
  • Alderweireldt S; LAL, Université Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, Orsay, France.
  • Aleksa M; INFN Bologna and Universita' di Bologna, Dipartimento di Fisica, Italy.
  • Aleksandrov IN; INFN Sezione di Bologna, Italy.
  • Alexa C; Department of Physics and Astronomy, University of Victoria, Victoria, British Columbia, Canada.
  • Alexandre D; Instituto de Física La Plata, Universidad Nacional de La Plata and CONICET, La Plata, Argentina.
  • Alexopoulos T; CERN, Geneva, Switzerland.
Phys Rev Lett ; 123(5): 052001, 2019 Aug 02.
Article em En | MEDLINE | ID: mdl-31491300
ABSTRACT
This Letter describes the observation of the light-by-light scattering process, γγ→γγ, in Pb+Pb collisions at sqrt[s_{NN}]=5.02 TeV. The analysis is conducted using a data sample corresponding to an integrated luminosity of 1.73 nb^{-1}, collected in November 2018 by the ATLAS experiment at the LHC. Light-by-light scattering candidates are selected in events with two photons produced exclusively, each with transverse energy E_{T}^{γ}>3 GeV and pseudorapidity |η_{γ}|<2.4, diphoton invariant mass above 6 GeV, and small diphoton transverse momentum and acoplanarity. After applying all selection criteria, 59 candidate events are observed for a background expectation of 12±3 events. The observed excess of events over the expected background has a significance of 8.2 standard deviations. The measured fiducial cross section is 78±13(stat)±7(syst)±3(lumi) nb.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Ano de publicação: 2019 Tipo de documento: Article
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Ano de publicação: 2019 Tipo de documento: Article