Centrality dependence of low-momentum direct-photon production in Au+Au collisions at sNN=200 GeV

Adare, A.; Afanasiev, S.; Aidala, C.; Ajitanand, N. N.; Akiba, Y.; Akimoto, R.; Al-Bataineh, H.; Al-Ta'ani, H.; Alexander, J.; Angerami, A.; Aoki, K.; Apadula, N.; Aramaki, Y.; Asano, H.; Aschenauer, E. C.; Atomssa, E. T.; Averbeck, R.; Awes, T. C.; Azmoun, B.; Babintsev, V.; Bai, M.; Baksay, G.; Baksay, L.; Bannier, B.; Barish, K. N.; Bassalleck, B.; Basye, A. T.; Bathe, S.; Baublis, V.; Baumann, C.; Baumgart, S.; Bazilevsky, A.; Belikov, S.; Belmont, R.; Bennett, R.; Berdnikov, A.; Berdnikov, Y.; Bickley, A. A.; Bing, X.; Blau, D. S.; Bok, J. S.; Boyle, K.; Brooks, M. L.; Buesching, H.; Bumazhnov, V.; Bunce, G.; Butsyk, S.; Camacho, C. M.; Campbell, S.; Castera, P.; Chen, C. -H.; Chi, C. Y.; Chiu, M.; Choi, I. J.; Choi, J. B.; Choi, S.; Choudhury, R. K.; Christiansen, P.; Chujo, T.; Chung, P.; Chvala, O.; Cianciolo, V.; Citron, Z.; Cole, B. A.; Connors, M.; Constantin, P.; Csanád, M.; Csörgő, T.; Dahms, T.; Dairaku, S.; Danchev, I.; Das, K.; Datta, A.; Daugherity, M. 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doi:10.1103/PhysRevC.91.064904

Title: Centrality dependence of low-momentum direct-photon production in $Au + Au$ collisions at $\sqrt{s_{N N}} = 200 GeV$

Journal Article · Fri Jun 05 00:00:00 EDT 2015 · Physical Review. C. Nuclear Physics

DOI:https://doi.org/10.1103/PhysRevC.91.064904· OSTI ID:1188244

Adare, A.; Afanasiev, S.; Aidala, C.; Ajitanand, N. N.; Akiba, Y.; Akimoto, R.; Al-Bataineh, H.; Al-Ta'ani, H.; Alexander, J.; Angerami, A.; Aoki, K.; Apadula, N.; Aramaki, Y.; Asano, H.; Aschenauer, E. C.; Atomssa, E. T.; Averbeck, R.; Awes, T. C.; Azmoun, B.; Babintsev, V. more »

The PHENIX experiment at RHIC has measured the centrality dependence of the direct photon yield from Au+Au collisions at √s_NN = 200 GeV down to p_T = 0.4 GeV/c. Photons are detected via photon conversions to e⁺e⁻ pairs and an improved technique is applied that minimizes the systematic uncertainties that usually limit direct photon measurements, in particular at low p_T . In this paper, we find an excess of direct photons above the N_coll-scaled yield measured in p+p collisions. This excess yield is well described by an exponential distribution with an inverse slope of about 240 MeV/c in the p_T range from 0.6–2.0 GeV/c. Finally, in this study, while the shape of the p_T distribution is independent of centrality within the experimental uncertainties, the yield increases rapidly with increasing centrality, scaling approximately with N ^α _part, where α = 1.38±0.03(stat)±0.07(syst).

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

Contributing Organization:: PHENIX Collaboration

Grant/Contract Number:: SC00112704; AC05-00OR22725

OSTI ID:: 1188244

Alternate ID(s):: OSTI ID: 1184688; OSTI ID: 1324135

Report Number(s):: BNL-108031-2015-JA; PRVCAN

Journal Information:: Physical Review. C. Nuclear Physics, Vol. 91, Issue 6; ISSN 0556-2813

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 120 works

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Probing nuclear modifications of parton distribution functions through the isolated prompt photon production at energies available at the CERN Large Hadron Collider Goharipour, Muhammad; Rostami, S. Physical Review C, Vol. 99, Issue 5 https://doi.org/10.1103/physrevc.99.055206	journal	May 2019
Effect of the magnetic field on the photon radiation from quark–gluon plasma in heavy ion collisions Zakharov, B. G. The European Physical Journal C, Vol. 76, Issue 11 https://doi.org/10.1140/epjc/s10052-016-4451-8	journal	November 2016
Prompt photon yield and elliptic flow from gluon fusion induced by magnetic fields in relativistic heavy-ion collisions Ayala, Alejandro; Castaño-Yepes, Jorge David; Dominguez, C. A. Physical Review D, Vol. 96, Issue 1 https://doi.org/10.1103/physrevd.96.014023	journal	July 2017
Hadronic and partonic sources of direct photons in relativistic heavy-ion collisions Linnyk, O.; Konchakovski, V.; Steinert, T. Physical Review C, Vol. 92, Issue 5 https://doi.org/10.1103/physrevc.92.054914	journal	November 2015
Collectivity and electromagnetic radiation in small systems Shen, Chun; Paquet, Jean-François; Denicol, Gabriel S. arXiv https://doi.org/10.48550/arxiv.1609.02590	text	January 2016
Thermal photons from gluon fusion with magnetic fields Ayala, Alejandro; Castaño-Yepes, Jorge David; Dominguez, C. A. EPJ Web of Conferences, Vol. 141 https://doi.org/10.1051/epjconf/201714102007	journal	January 2017
Collectivity and electromagnetic radiation in small systems Shen, Chun; Paquet, Jean-François; Denicol, Gabriel S. Physical Review C, Vol. 95, Issue 1 https://doi.org/10.1103/physrevc.95.014906	journal	January 2017
Beam Energy and Centrality Dependence of Direct-Photon Emission from Ultrarelativistic Heavy-Ion Collisions Adare, A.; Afanasiev, S.; Aidala, C. Physical Review Letters, Vol. 123, Issue 2 https://doi.org/10.1103/physrevlett.123.022301	journal	July 2019
The production of photons in relativistic heavy-ion collisions Paquet, Jean-François; Shen, Chun; Denicol, Gabriel S. arXiv https://doi.org/10.48550/arxiv.1509.06738	text	January 2015
Erratum: Prompt photon yield and elliptic flow from gluon fusion induced by magnetic fields in relativistic heavy-ion collisions [Phys. Rev. D 96 , 014023 (2017)] Ayala, Alejandro; Castaño-Yepes, Jorge David; Dominguez, C. A. Physical Review D, Vol. 96, Issue 11 https://doi.org/10.1103/physrevd.96.119901	journal	December 2017
Thermal photon, dilepton production, and electric charge transport in a baryon rich strongly coupled QGP from holography Finazzo, Stefano Ivo; Rougemont, Romulo Physical Review D, Vol. 93, Issue 3 https://doi.org/10.1103/physrevd.93.034017	journal	February 2016
Direct photon production at low transverse momentum in proton-proton collisions at $\sqrt{s} = 2.76$ and 8 TeV Acharya, S.; Acosta, F. T. -.; Adamová, D. Physical Review C, Vol. 99, Issue 2 https://doi.org/10.1103/physrevc.99.024912	journal	February 2019
Beam-energy and centrality dependence of direct-photon emission from ultra-relativistic heavy-ion collisions Adare, A.; Afanasiev, S.; Aidala, C. arXiv https://doi.org/10.48550/arxiv.1805.04084	text	January 2018

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