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

Adare, A. ; Christiansen, Peter LU ; Gustafsson, Hans-Åke LU ; Haslum, Eva LU ; Nystrand, Joakim LU ; Oskarsson, Anders LU ; Otterlund, Ingvar LU ; Rosendahl, Sarah LU ; Silvermyr, David LU and Stenlund, Evert LU , et al. (2019) In Physical Review Letters 123(2).
Abstract
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.
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organization
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type
Contribution to journal
publication status
published
subject
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
in
Physical Review Letters
volume
123
issue
2
article number
022301
publisher
American Physical Society
external identifiers
  • scopus:85069921283
  • pmid:31386493
ISSN
1079-7114
DOI
10.1103/PhysRevLett.123.022301
language
English
LU publication?
yes
id
706ed61f-7215-47b5-849d-9bea331d46c1
alternative location
https://www.scopus.com/inward/record.uri?eid=2-s2.0-85069921283&doi=10.1103%2fPhysRevLett.123.022301&partnerID=40&md5=8bb199c6b6c3e1722b1bc416abb104d3
date added to LUP
2019-08-30 10:31:06
date last changed
2020-12-29 04:21:53
@article{706ed61f-7215-47b5-849d-9bea331d46c1,
  abstract     = {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.},
  author       = {Adare, A. and Christiansen, Peter and Gustafsson, Hans-Åke and Haslum, Eva and Nystrand, Joakim and Oskarsson, Anders and Otterlund, Ingvar and Rosendahl, Sarah and Silvermyr, David and Stenlund, Evert and Tydesjö, Henrik and Zou, L.},
  issn         = {1079-7114},
  language     = {eng},
  month        = {07},
  number       = {2},
  publisher    = {American Physical Society},
  series       = {Physical Review Letters},
  title        = {Beam Energy and Centrality Dependence of Direct-Photon Emission from Ultrarelativistic Heavy-Ion Collisions},
  url          = {http://dx.doi.org/10.1103/PhysRevLett.123.022301},
  doi          = {10.1103/PhysRevLett.123.022301},
  volume       = {123},
  year         = {2019},
}