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David Silvermyr

David Silvermyr

Senior lecturer

David Silvermyr

Beam Energy and Centrality Dependence of Direct-Photon Emission from Ultrarelativistic Heavy-Ion Collisions

Author

  • A. Adare
  • Peter Christiansen
  • Hans-Åke Gustafsson
  • Eva Haslum
  • Joakim Nystrand
  • Anders Oskarsson
  • Ingvar Otterlund
  • Sarah Rosendahl
  • David Silvermyr
  • Evert Stenlund
  • Henrik Tydesjö
  • L. Zou

Summary, in English

The PHENIX collaboration presents first measurements of low-momentum (0.41 GeV/c) direct-photon yield dNγdir/dη is a smooth function of dNch/dη and can be well described as proportional to (dNch/dη)α with α≈1.25. This scaling behavior holds for a wide range of beam energies at the Relativistic Heavy Ion Collider and the Large Hadron Collider, for centrality selected samples, as well as for different A+A collision systems. At a given beam energy, the scaling also holds for high pT (>5 GeV/c), but when results from different collision energies are compared, an additional sNN-dependent multiplicative factor is needed to describe the integrated-direct-photon yield. © 2019 authors. Published by the American Physical Society.

Department/s

  • eSSENCE: The e-Science Collaboration
  • Particle and nuclear physics

Publishing year

2019-07-10

Language

English

Publication/Series

Physical Review Letters

Volume

123

Issue

2

Document type

Journal article

Publisher

American Physical Society

Topic

  • Subatomic Physics

Keywords

  • Heavy ions
  • Photons
  • Au+Au collisions
  • Collision energies
  • Collision systems
  • Large Hadron Collider
  • Multiplicative factors
  • Relativistic Heavy Ion Collider
  • Scaling behavior
  • Ultrarelativistic heavy ion collision
  • Colliding beam accelerators

Status

Published

ISBN/ISSN/Other

  • ISSN: 1079-7114