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Measurements of underlying-event properties using neutral and charged particles in pp collisions at √s = 900 GeV and √s = 7 TeV with the ATLAS detector at the LHC

  • The ATLAS collaboration
  • University of Oxford
  • Sun Yat-Sen University
  • Southern Methodist University
  • CERN
  • Michigan State University
  • University of Göttingen
  • University of Würzburg
  • High Energy Accelerator Research Organization, Tsukuba
  • Ritsumeikan University
  • University of Birmingham
  • University of Toronto
  • Shandong University
  • Academia Sinica - Institute of Physics
  • CAS - Institute of High Energy Physics
  • Laboratório de Instrumentação e Física Experimental de Partículas
  • Indiana University Bloomington
  • University of Texas at Arlington
  • Nanjing University
  • Aix-Marseille Université and CNRS/IN2P3
  • CEA Saclay (Commissariat À l'Energie Atomique et Aux Energies Alternatives)
  • University of Bonn
  • University of Freiburg
  • University of Oklahoma
  • Institute for High Energy Physics
  • University of Geneva
  • Azerbaijan National Academy of Sciences
  • Oklahoma State University
  • Tel Aviv University
  • Université Paris-Sud
  • National Institute for Nuclear Physics
  • University of Milan
  • University of Lisbon
  • Abdus Salam International Centre for Theoretical Physics
  • United States Department of Energy
  • Hampton University
  • Yale University
  • Max Planck Institute for Physics (Werner Heisenberg Institute)
  • Ludwig Maximilian University of Munich
  • Queen Mary University of London
  • Rutherford Appleton Laboratory
  • Brandeis University
  • University of Granada
  • Johannes Gutenberg University Mainz
  • Boston University
  • Stony Brook University
  • University of Texas at Dallas
  • University of Rome Tor Vergata
  • Bogazici University
  • Istanbul Technical University
  • Lund University
  • The University of Tokyo
  • RAS - P.N. Lebedev Physics Institute
  • SUNY Albany
  • Royal Holloway University of London
  • Laboratoire de Physique Subatomique et de Cosmologie de Grenoble
  • Joint Institute for Nuclear Research

Research output: Contribution to journalArticlepeer-review

39 Scopus citations

Abstract

We present first measurements of charged and neutral particle-flow correlations in pp collisions using the ATLAS calorimeters.Data were collected in 2009 and 2010 at centre-of-mass energies of 900 GeV and 7 TeV.Events were selected using a minimum-bias trigger which required a charged particle in scintillation counters on either side of the interaction point.Particle flows, sensitive to the underlying event, are measured using clusters of energy in the ATLAS calorimeters, taking advantage of their fine granularity.No Monte Carlo generator used in this analysis can accurately describe the measurements.The results are independent of those based on charged particles measured by the ATLAS tracking systems and can be used to constrain the parameters of Monte Carlo generators.

Original languageEnglish
Article number1636
JournalEuropean Physical Journal C
Volume71
Issue number5
DOIs
StatePublished - 2011

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