Skip to main content

Lund University Publications

LUND UNIVERSITY LIBRARIES

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 orcid 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.
Please use this url to cite or link to this publication:
author
; ; ; ; ; ; ; ; and , et al. (More)
; ; ; ; ; ; ; ; ; ; and (Less)
author collaboration
organization
publishing date
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
2023-04-09 22:20:08
@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}},
  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}},
  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}},
}