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

A. Adare; Peter Christiansen; Hans-Åke Gustafsson; Eva Haslum; Joakim Nystrand; Anders Oskarsson; Ingvar Otterlund; Sarah Rosendahl; David Silvermyr; Evert Stenlund; Henrik Tydesjö; L. Zou; PHENIX Collaboration

doi:10.1103/PhysRevLett.123.022301

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

A. Adare, Peter Christiansen, Hans-Åke Gustafsson, Eva Haslum, Joakim Nystrand, Anders Oskarsson, Ingvar Otterlund, Sarah Rosendahl, David Silvermyr, Evert Stenlund, Henrik Tydesjö, L. Zou, PHENIX Collaboration

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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.

Original language	English
Article number	022301
Journal	Physical Review Letters
Volume	123
Issue number	2
DOIs	https://doi.org/10.1103/PhysRevLett.123.022301
Publication status	Published - 2019 Jul 10

Subject classification (UKÄ)

Subatomic Physics

Free 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

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https://www.scopus.com/inward/record.uri?eid=2-s2.0-85069921283&doi=10.1103%2fPhysRevLett.123.022301&partnerID=40&md5=8bb199c6b6c3e1722b1bc416abb104d3

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Adare, A., Christiansen, P., Gustafsson, H.-Å., Haslum, E., Nystrand, J., Oskarsson, A., Otterlund, I., Rosendahl, S., Silvermyr, D., Stenlund, E., Tydesjö, H., Zou, L., & 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

@article{706ed61f721547b5849d9bea331d46c1,

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. {\textcopyright} 2019 authors. Published by the American Physical Society.",

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",

author = "A. Adare and Peter Christiansen and Hans-{\AA}ke Gustafsson and Eva Haslum and Joakim Nystrand and Anders Oskarsson and Ingvar Otterlund and Sarah Rosendahl and David Silvermyr and Evert Stenlund and Henrik Tydesj{\"o} and L. Zou and \{PHENIX Collaboration\}",

year = "2019",

month = jul,

day = "10",

doi = "10.1103/PhysRevLett.123.022301",

language = "English",

volume = "123",

journal = "Physical Review Letters",

issn = "1079-7114",

publisher = "American Physical Society",

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Adare, A, Christiansen, P, Gustafsson, H-Å, Haslum, E, Nystrand, J, Oskarsson, A, Otterlund, I, Rosendahl, S, Silvermyr, D, Stenlund, E, Tydesjö, H, Zou, L & PHENIX Collaboration 2019, 'Beam Energy and Centrality Dependence of Direct-Photon Emission from Ultrarelativistic Heavy-Ion Collisions', Physical Review Letters, vol. 123, no. 2, 022301. https://doi.org/10.1103/PhysRevLett.123.022301

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

AU - Adare, A.

AU - Christiansen, Peter

AU - Gustafsson, Hans-Åke

AU - Haslum, Eva

AU - Nystrand, Joakim

AU - Oskarsson, Anders

AU - Otterlund, Ingvar

AU - Rosendahl, Sarah

AU - Silvermyr, David

AU - Stenlund, Evert

AU - Tydesjö, Henrik

AU - Zou, L.

AU - PHENIX Collaboration

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. © 2019 authors. Published by the American Physical Society.

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. © 2019 authors. Published by the American Physical Society.

KW - Heavy ions

KW - Photons

KW - Au+Au collisions

KW - Collision energies

KW - Collision systems

KW - Large Hadron Collider

KW - Multiplicative factors

KW - Relativistic Heavy Ion Collider

KW - Scaling behavior

KW - Ultrarelativistic heavy ion collision

KW - Colliding beam accelerators

UR - https://www.scopus.com/pages/publications/85069921283

U2 - 10.1103/PhysRevLett.123.022301

DO - 10.1103/PhysRevLett.123.022301

M3 - Article

C2 - 31386493

SN - 1079-7114

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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