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

dc.contributor.authorA. Adare
dc.contributor.authorS. Afanasiev
dc.contributor.authorC. Aidala
dc.contributor.authorN.N. Ajitanand
dc.contributor.authorY. Akiba
dc.contributor.authorR. Akimoto
dc.contributor.authorH. Al-Bataineh
dc.contributor.authorJ. Alexander
dc.contributor.authorM. Alfred
dc.contributor.authorA. Al-Jamel
dc.contributor.authorH. Al-Ta'Ani
dc.contributor.authorA. Angerami
dc.contributor.authorK. Aoki
dc.contributor.authorN. Apadula
dc.contributor.authorL. Aphecetche
dc.contributor.authorY. Aramaki
dc.contributor.authorR. Armendariz
dc.contributor.authorS.H. Aronson
dc.contributor.authorJ. Asai
dc.contributor.authorH. Asano
dc.contributor.authorE.C. Aschenauer
dc.contributor.authorE.T. Atomssa
dc.contributor.authorR. Averbeck
dc.contributor.authorT.C. Awes
dc.contributor.authorB. Azmoun
dc.contributor.authorV. Babintsev
dc.contributor.authorA. Bagoly
dc.contributor.authorM. Bai
dc.contributor.authorG. Baksay
dc.contributor.authorL. Baksay
dc.contributor.authorA. Baldisseri
dc.contributor.authorB. Bannier
dc.contributor.authorK.N. Barish
dc.contributor.authorP.D. Barnes
dc.contributor.authorB. Bassalleck
dc.contributor.authorA.T. Basye
dc.contributor.authorS. Bathe
dc.contributor.authorS. Batsouli
dc.contributor.authorV. Baublis
dc.contributor.authorF. Bauer
dc.contributor.authorC. Baumann
dc.contributor.authorS. Baumgart
dc.contributor.authorA. Bazilevsky
dc.contributor.authorS. Belikov
dc.contributor.authorR. Belmont
dc.contributor.authorR. Bennett
dc.contributor.authorA. Berdnikov
dc.contributor.authorY. Berdnikov
dc.contributor.authorJ.H. Bhom
dc.contributor.authorA.A. Bickley
dc.contributor.authorM.T. Bjorndal
dc.contributor.authorD.S. Blau
dc.contributor.authorM. Boer
dc.contributor.authorJ.G. Boissevain
dc.contributor.authorJ.S. Bok
dc.contributor.authorH. Borel
dc.contributor.authorK. Boyle
dc.contributor.authorM.L. Brooks
dc.contributor.authorD.S. Brown
dc.contributor.authorJ. Bryslawskyj
dc.contributor.authorD. Bucher
dc.contributor.authorH. Buesching
dc.contributor.authorV. Bumazhnov
dc.contributor.authorG. Bunce
dc.contributor.authorJ.M. Burward-Hoy
dc.contributor.authorS. Butsyk
dc.contributor.authorC.M. Camacho
dc.contributor.authorS. Campbell
dc.contributor.authorV. Canoa Roman
dc.contributor.authorA. Caringi
dc.contributor.authorP. Castera
dc.contributor.authorJ.-S. Chai
dc.contributor.authorB.S. Chang
dc.contributor.authorW.C. Chang
dc.contributor.authorJ.-L. Charvet
dc.contributor.authorC.-H. Chen
dc.contributor.authorS. Chernichenko
dc.contributor.authorC.Y. Chi
dc.contributor.authorJ. Chiba
dc.contributor.authorM. Chiu
dc.contributor.authorI.J. Choi
dc.contributor.authorJ.B. Choi
dc.contributor.authorS. Choi
dc.contributor.authorR.K. Choudhury
dc.contributor.authorP. Christiansen
dc.contributor.authorT. Chujo
dc.contributor.authorP. Chung
dc.contributor.authorA. Churyn
dc.contributor.authorO. Chvala
dc.contributor.authorV. Cianciolo
dc.contributor.authorZ. Citron
dc.contributor.authorC.R. Cleven
dc.contributor.authorY. Cobigo
dc.contributor.authorB.A. Cole
dc.contributor.authorM.P. Comets
dc.contributor.authorZ. Conesa Del Valle
dc.contributor.authorM. Connors
dc.contributor.authorP. Constantin
dc.contributor.authorM. Csanád
dc.contributor.authorT. Csörgo
dc.contributor.authorT. Dahms
dc.contributor.authorS. Dairaku
dc.contributor.authorI. Danchev
dc.contributor.authorT.W. Danley
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dc.contributor.authorA. Datta
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dc.contributor.authorG. David
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dc.contributor.authorD. D'Enterria
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dc.contributor.authorK. Hill
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dc.contributor.authorA. Hodges
dc.contributor.authorM. Hohlmann
dc.contributor.authorR.S. Hollis
dc.contributor.authorM. Holmes
dc.contributor.authorW. Holzmann
dc.contributor.authorK. Homma
dc.contributor.authorB. Hong
dc.contributor.authorT. Horaguchi
dc.contributor.authorY. Hori
dc.contributor.authorD. Hornback
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dc.contributor.authorM. Virius
dc.contributor.authorA. Vossen
dc.contributor.authorV. Vrba
dc.contributor.authorE. Vznuzdaev
dc.contributor.authorM. Wagner
dc.contributor.authorD. Walker
dc.contributor.authorX.R. Wang
dc.contributor.authorD. Watanabe
dc.contributor.authorK. Watanabe
dc.contributor.authorY. Watanabe
dc.contributor.authorY.S. Watanabe
dc.contributor.authorF. Wei
dc.contributor.authorR. Wei
dc.contributor.authorJ. Wessels
dc.contributor.authorS.N. White
dc.contributor.authorN. Willis
dc.contributor.authorD. Winter
dc.contributor.authorS. Wolin
dc.contributor.authorC.P. Wong
dc.contributor.authorC.L. Woody
dc.contributor.authorR.M. Wright
dc.contributor.authorM. Wysocki
dc.contributor.authorB. Xia
dc.contributor.authorW. Xie
dc.contributor.authorC. Xu
dc.contributor.authorQ. Xu
dc.contributor.authorY.L. Yamaguchi
dc.contributor.authorK. Yamaura
dc.contributor.authorR. Yang
dc.contributor.authorA. Yanovich
dc.contributor.authorZ. Yasin
dc.contributor.authorJ. Ying
dc.contributor.authorS. Yokkaichi
dc.contributor.authorJ.H. Yoo
dc.contributor.authorZ. You
dc.contributor.authorG.R. Young
dc.contributor.authorI. Younus
dc.contributor.authorH. Yu
dc.contributor.authorI.E. Yushmanov
dc.contributor.authorW.A. Zajc
dc.contributor.authorO. Zaudtke
dc.contributor.authorA. Zelenski
dc.contributor.authorC. Zhang
dc.contributor.authorS. Zharko
dc.contributor.authorS. Zhou
dc.contributor.authorJ. Zimamyi
dc.contributor.authorL. Zolin
dc.contributor.authorL. Zou
dc.date.accessioned2026-02-07T09:04:48Z
dc.date.issued2019
dc.description.abstractThe 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. © 2019 authors. Published by the American Physical Society.
dc.identifier.doi10.1103/PhysRevLett.123.022301
dc.identifier.issn319007
dc.identifier.urihttps://doi.org/10.1103/PhysRevLett.123.022301
dc.identifier.urihttps://dl.bhu.ac.in/bhuir/handle/123456789/33556
dc.publisherAmerican Physical Society
dc.titleBeam Energy and Centrality Dependence of Direct-Photon Emission from Ultrarelativistic Heavy-Ion Collisions
dc.typePublication
dspace.entity.typeArticle

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