PHENIX measurements of beam energy dependence of direct photon emission

PHENIX Collaboration

PHENIX measurements of beam energy dependence of direct photon emission

PHENIX Collaboration

Physics and Astronomy

Stony Brook University

Research output: Contribution to journal › Conference article › peer-review

Abstract

In this talk the PHENIX collaboration presents new measurements of low momentum direct photons from Cu+Cu at 200 GeV and Au+Au at 62.4 GeV and 39 GeV. A large excess of direct photons over the scaled p+p yield is found. The comparison of the new data with data from Au+Au at 200 GeV and ALICE data from 2.76 TeV reveals that at low-p_T the spectra of direct photons and their integrated yield above 1 GeV/c follow a universal scaling as a function of the charged-particle multiplicity, (dN_ch/dη)^α, with α = 1.25, independent of collision centrality or center of mass energy. The observed scaling properties suggests that the emission source has similar properties for all observed systems.

Original language	English
Journal	Proceedings of Science
Volume	345
State	Published - 2018
Event	2018 International Conference on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions, Hard Probes 2018 - Aix-Les-Bains, Savoie, France Duration: Sep 30 2018 → Oct 5 2018

Cite this

@article{a9990cdd6c7447eeb2f6e05d6794223d,

title = "PHENIX measurements of beam energy dependence of direct photon emission",

abstract = "In this talk the PHENIX collaboration presents new measurements of low momentum direct photons from Cu+Cu at 200 GeV and Au+Au at 62.4 GeV and 39 GeV. A large excess of direct photons over the scaled p+p yield is found. The comparison of the new data with data from Au+Au at 200 GeV and ALICE data from 2.76 TeV reveals that at low-pT the spectra of direct photons and their integrated yield above 1 GeV/c follow a universal scaling as a function of the charged-particle multiplicity, (dNch/dη)α, with α = 1.25, independent of collision centrality or center of mass energy. The observed scaling properties suggests that the emission source has similar properties for all observed systems.",

author = "\{PHENIX Collaboration\} and Axel Drees",

note = "Publisher Copyright: {\textcopyright} Copyright owned by the author(s) under the terms of the Creative Commons.; 2018 International Conference on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions, Hard Probes 2018 ; Conference date: 30-09-2018 Through 05-10-2018",

year = "2018",

language = "English",

volume = "345",

journal = "Proceedings of Science",

issn = "1824-8039",

}

TY - JOUR

T1 - PHENIX measurements of beam energy dependence of direct photon emission

AU - PHENIX Collaboration

AU - Drees, Axel

N1 - Publisher Copyright: © Copyright owned by the author(s) under the terms of the Creative Commons.

PY - 2018

Y1 - 2018

N2 - In this talk the PHENIX collaboration presents new measurements of low momentum direct photons from Cu+Cu at 200 GeV and Au+Au at 62.4 GeV and 39 GeV. A large excess of direct photons over the scaled p+p yield is found. The comparison of the new data with data from Au+Au at 200 GeV and ALICE data from 2.76 TeV reveals that at low-pT the spectra of direct photons and their integrated yield above 1 GeV/c follow a universal scaling as a function of the charged-particle multiplicity, (dNch/dη)α, with α = 1.25, independent of collision centrality or center of mass energy. The observed scaling properties suggests that the emission source has similar properties for all observed systems.

AB - In this talk the PHENIX collaboration presents new measurements of low momentum direct photons from Cu+Cu at 200 GeV and Au+Au at 62.4 GeV and 39 GeV. A large excess of direct photons over the scaled p+p yield is found. The comparison of the new data with data from Au+Au at 200 GeV and ALICE data from 2.76 TeV reveals that at low-pT the spectra of direct photons and their integrated yield above 1 GeV/c follow a universal scaling as a function of the charged-particle multiplicity, (dNch/dη)α, with α = 1.25, independent of collision centrality or center of mass energy. The observed scaling properties suggests that the emission source has similar properties for all observed systems.

UR - https://www.scopus.com/pages/publications/85072709630

M3 - Conference article

AN - SCOPUS:85072709630

SN - 1824-8039

VL - 345

JO - Proceedings of Science

JF - Proceedings of Science

T2 - 2018 International Conference on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions, Hard Probes 2018

Y2 - 30 September 2018 through 5 October 2018

ER -

PHENIX measurements of beam energy dependence of direct photon emission

Abstract

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