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Transverse energy production and charged-particle multiplicity at midrapidity in various systems from sNN =7.7 to 200 GeV

  • PHENIX Collaboration
  • University of Colorado Boulder
  • Japan Atomic Energy Agency
  • Columbia University
  • Lawrence Livermore National Laboratory
  • University of Maryland, College Park
  • University of Massachusetts
  • Seoul National University
  • Petersburg Nuclear Physics Institute (PNPI)
  • RIKEN
  • The University of Tokyo
  • University of New Mexico
  • Hiroshima University
  • Károly Róberts University College
  • Russian Research Centre Kurchatov Institute
  • Czech Academy of Sciences
  • Stony Brook University
  • United States Department of Energy
  • Kyoto University
  • Ohio University
  • Howard University
  • Brookhaven National Laboratory
  • China National Nuclear Corporation
  • Ewha Womans University
  • Czech Technical University in Prague
  • University of California at Riverside
  • University of Zagreb
  • Moscow Engineering Physics Institute
  • Abilene Christian University
  • City University of New York
  • Peking University
  • University of Michigan, Ann Arbor
  • University of Tsukuba

Research output: Contribution to journalJournal articlepeer-review

Abstract

Measurements of midrapidity charged-particle multiplicity distributions, dNch/dη, and midrapidity transverse-energy distributions, dET/dη, are presented for a variety of collision systems and energies. Included are distributions for Au+Au collisions at sNN=200, 130, 62.4, 39, 27, 19.6, 14.5, and 7.7 GeV, Cu+Cu collisions at sNN=200 and 62.4 GeV, Cu+Au collisions at sNN=200 GeV, U+U collisions at sNN=193 GeV, d+Au collisions at sNN=200 GeV, He3+Au collisions at sNN=200 GeV, and p+p collisions at sNN=200 GeV. Centrality-dependent distributions at midrapidity are presented in terms of the number of nucleon participants, Npart, and the number of constituent quark participants, Nqp. For all A+A collisions down to sNN=7.7 GeV, it is observed that the midrapidity data are better described by scaling with Nqp than scaling with Npart. Also presented are estimates of the Bjorken energy density, BJ, and the ratio of dET/dη to dNch/dη, the latter of which is seen to be constant as a function of centrality for all systems.

Original languageEnglish
Article number024901
JournalPhysical Review C
Volume93
Issue number2
DOIs
StatePublished - 2016.02.3

Quacquarelli Symonds(QS) Subject Topics

  • Physics & Astronomy

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