Beam Energy and Centrality Dependence of Direct-Photon Emission from Ultrarelativistic Heavy-Ion Collisions
PHENIX Collaboration. (2019). Beam Energy and Centrality Dependence of Direct-Photon Emission from Ultrarelativistic Heavy-Ion Collisions. Physical Review Letters, 123(2), Article 022301. https://doi.org/10.1103/PhysRevLett.123.022301
Published in
Physical Review LettersAuthors
Date
2019Copyright
© PHENIX Collaboration, 2019.
The PHENIX collaboration presents first measurements of low-momentum (0.41 GeV/c) direct-photon yield dNdirγ/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.
Publisher
American Physical SocietyISSN Search the Publication Forum
0031-9007Keywords
Publication in research information system
https://converis.jyu.fi/converis/portal/detail/Publication/32167083
Metadata
Show full item recordCollections
License
Related items
Showing items with similar title or keywords.
-
Low-momentum direct-photon measurement in Cu + Cu collisions at √sNN = 200 GeV
PHENIX Collaboration (American Physical Society, 2018)We measured direct photons for pT < 5 GeV/c in minimum bias and 0%–40% most-central events at midrapidity for Cu+Cu collisions at √sNN = 200 GeV. The e+e− contribution from quasireal direct virtual photons has been ... -
Event-by-event hydrodynamics and thermal photon production in ultrarelativistic heavy ion collisions
Holopainen, Hannu (University of Jyväskylä, 2011) -
Neutron-skin effect in direct-photon and charged-hadron production in Pb+Pb collisions at the LHC
Helenius, Ilkka; Paukkunen, Hannu; Eskola, Kari (Springer, 2017)A well-established observation in nuclear physics is that in neutron-rich spherical nuclei the distribution of neutrons extends farther than the distribution of protons. In this work, we scrutinize the influence of this ... -
Centrality and rapidity dependence of inclusive pion and prompt photon production in p+Pb collisions at the LHC with EPS09s nPDFs
Helenius, Ilkka; Eskola, Kari; Paukkunen, Hannu (Institute of Physics Publishing Ltd., 2015)The centrality dependencies of the inclusive neutral pion and prompt photon nuclear modification factors for p+Pb collisions at the LHC are studied using a spatially dependent set of nuclear PDFs, EPS09s. The calculations ... -
Centrality dependence of high-pT D meson suppression in Pb-Pb collisions at √sNN = 2.76 TeV
ALICE Collaboration (Springer Berlin Heidelberg, 2015)The nuclear modification factor, RAA, of the prompt charmed mesons D0 , D+ and D∗+, and their antiparticles, was measured with the ALICE detector in Pb-Pb collisions at a centre-of-mass energy √ sNN = 2.76 TeV in two ...