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

(PHENIX Collaboration)

doi:10.1103/PhysRevLett.123.022301

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

(PHENIX Collaboration)

University of Colorado Boulder
Joint Institute for Nuclear Research, Dubna
Columbia University
MST-8, Los Alamos National Laboratory
UMass Amherst
University of Michigan, Ann Arbor
Stony Brook University
RIKEN Nishina Center for Accelerator-Based Science
Riken BNL Research Center
University of Tokyo
New Mexico State University
Howard University
High Energy Accelerator Research Organization (KEK)
Kyoto University
Iowa State University
Université de Nantes
Brookhaven National Laboratory
Ip Paris
Oak Ridge National Laboratory
Kurchatov Institute
Eötvös Loránd University
Florida Institute of Technology
Institut Pierre Simon Laplace, CNRS and CEA
University of California, Riverside
University of New Mexico
Abilene Christian University
Baruch College
Petersburg Nuclear Physics Institute (PNPI)
University of Münster
Vanderbilt University
St. Petersburg State Polytechnical University
Yonsei University
Kurchatov Institute
National Research Nuclear University MEPhI
Muhlenberg College
Cyclotron Application Laboratory
Sungkyunkwan University
Academia Sinica, Institute Of Physics
University of Illinois at Urbana-Champaign
Chonbuk National University
Seoul National University
Bhabha Atomic Research Centre
Lund University
University of Tsukuba
Weizmann Institute of Science Israel
Georgia State University
Université Paris-Saclay
Eszterhazy Karoly University
Hungarian Academy of Sciences
Ohio University
Florida State University
University of São Paulo
University of Maryland, College Park
University of Tennessee
Hiroshima University
Lawrence Livermore National Laboratory
Rikkyo University
Charles University
Université Blaise Pascal
Nagasaki Institute of Applied Science
Czech Technical University in Prague
Banaras Hindu University
Augustana University
Nara Women's University
Ewha Womans University
Tsinghua University
Japan Atomic Energy Agency
Korea University
Tokyo Institute of Technology
University of Debrecen
Myongji University
Waseda University
Hanyang University
University of Jyväskylä
Institute of Physics of the Czech Academy of Sciences
China Institute of Atomic Energy
University of Zagreb
Institute for Nuclear Research of the Russian Academy of Sciences
IGFL, Université de Lyon, Université Lyon 1
Lahore University of Management Sciences

Résultats de recherche: Contribution à un journal › Article › Revue par des pairs

Résumé

The PHENIX collaboration presents first measurements of low-momentum (0.4<pT<3 GeV/c) direct-photon yields from Au+Au collisions at sNN=39 and 62.4 GeV. For both beam energies the direct-photon yields are substantially enhanced with respect to expectations from prompt processes, similar to the yields observed in Au+Au collisions at sNN=200. Analyzing the photon yield as a function of the experimental observable dNch/dη reveals that the low-momentum (>1 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.

langue originale	Anglais
Numéro d'article	022301
journal	Physical Review Letters
Volume	123
Numéro de publication	2
Les DOIs	https://doi.org/10.1103/PhysRevLett.123.022301
état	Publié - 10 juil. 2019

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10.1103/PhysRevLett.123.022301

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@article{953a6f54226946c0aa98e32e0d086ed4,

title = "Beam Energy and Centrality Dependence of Direct-Photon Emission from Ultrarelativistic Heavy-Ion Collisions",

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.",

author = "\{(PHENIX Collaboration)\} and A. Adare and S. Afanasiev and C. Aidala and Ajitanand, \{N. N.\} and Y. Akiba and R. Akimoto and H. Al-Bataineh and J. Alexander and M. Alfred and A. Al-Jamel and H. Al-Ta'Ani and A. Angerami and K. Aoki and N. Apadula and L. Aphecetche and Y. Aramaki and R. Armendariz and Aronson, \{S. H.\} and J. Asai and H. Asano and Aschenauer, \{E. C.\} and Atomssa, \{E. T.\} and R. Averbeck and Awes, \{T. C.\} and B. Azmoun and V. Babintsev and A. Bagoly and M. Bai and G. Baksay and L. Baksay and A. Baldisseri and B. Bannier and Barish, \{K. N.\} and Barnes, \{P. D.\} and B. Bassalleck and Basye, \{A. T.\} and S. Bathe and S. Batsouli and V. Baublis and F. Bauer and C. Baumann and S. Baumgart and A. Bazilevsky and S. Belikov and R. Belmont and O. Drapier and F. Fleuret and M. Gonin and \{Granier De Cassagnac\}, R. and M. Nguyen",

note = "Publisher Copyright: {\textcopyright} 2019 authors. Published by the American Physical Society.",

year = "2019",

month = jul,

day = "10",

doi = "10.1103/PhysRevLett.123.022301",

language = "English",

volume = "123",

journal = "Physical Review Letters",

issn = "0031-9007",

number = "2",

}

TY - JOUR

T1 - Beam Energy and Centrality Dependence of Direct-Photon Emission from Ultrarelativistic Heavy-Ion Collisions

AU - (PHENIX Collaboration)

AU - Adare, A.

AU - Afanasiev, S.

AU - Aidala, C.

AU - Ajitanand, N. N.

AU - Akiba, Y.

AU - Akimoto, R.

AU - Al-Bataineh, H.

AU - Alexander, J.

AU - Alfred, M.

AU - Al-Jamel, A.

AU - Al-Ta'Ani, H.

AU - Angerami, A.

AU - Aoki, K.

AU - Apadula, N.

AU - Aphecetche, L.

AU - Aramaki, Y.

AU - Armendariz, R.

AU - Aronson, S. H.

AU - Asai, J.

AU - Asano, H.

AU - Aschenauer, E. C.

AU - Atomssa, E. T.

AU - Averbeck, R.

AU - Awes, T. C.

AU - Azmoun, B.

AU - Babintsev, V.

AU - Bagoly, A.

AU - Bai, M.

AU - Baksay, G.

AU - Baksay, L.

AU - Baldisseri, A.

AU - Bannier, B.

AU - Barish, K. N.

AU - Barnes, P. D.

AU - Bassalleck, B.

AU - Basye, A. T.

AU - Bathe, S.

AU - Batsouli, S.

AU - Baublis, V.

AU - Bauer, F.

AU - Baumann, C.

AU - Baumgart, S.

AU - Bazilevsky, A.

AU - Belikov, S.

AU - Belmont, R.

AU - Drapier, O.

AU - Fleuret, F.

AU - Gonin, M.

AU - Granier De Cassagnac, R.

AU - Nguyen, M.

PY - 2019/7/10

Y1 - 2019/7/10

N2 - 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.

AB - 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.

U2 - 10.1103/PhysRevLett.123.022301

DO - 10.1103/PhysRevLett.123.022301

M3 - Article

C2 - 31386493

AN - SCOPUS:85069921283

SN - 0031-9007

VL - 123

JO - Physical Review Letters

JF - Physical Review Letters

IS - 2

M1 - 022301

ER -

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

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