6533b862fe1ef96bd12c6c1b
RESEARCH PRODUCT
Centrality dependence of low-momentum direct-photon production inAu+Aucollisions atsNN=200 GeV
A. G. LitvinenkoD. KawallK. N. BarishS. SanoS. SanoA. KozlovR. SetoM. L. BrooksA. DeshpandeI. DanchevX. HeY. AramakiV. PeresedovRobert VertesiJ. KosterY. FukaoH. MasuiA. A. BickleyA. VeichtA. VeichtM. TomášekM. TomášekT. MurakamiMaya Hachiya ShimomuraS. DairakuJ. T. MitchellG. S. KyleM. KurosawaL. GuoAlexei KhanzadeevR. S. HollisShinichi MasumotoJen-chieh PengA. SenV. S. PantuevM. SanoY. I. MakdisiR. A. SoltzH. A. GustafssonT. HesterM. GoninM. Grosse PerdekampS. AfanasievN. A. SparksK. S. SimVladimir SamsonovVladimir SamsonovM. E. ConnorsJames AlexanderS. BaumgartT. TodorokiB. LewisC. ZhangTomoya TsujiM. MendozaS. N. WhiteA. SukhanovY. IkedaS. SawadaMasamichi IshiharaR. SeidlVladislav MankoM. SlunečkaA. EnokizonoA. EnokizonoD. ReynoldsK. KuritaH. PereiraBeomkyu KimO. DietzschE. StenlundR. AverbeckByung-sik HongY. TanakaHongfang LiuHongfang LiuP. ChungWei XieMinghui LiuY. MorinoR. YangP. RužičkaJ. B. ChoiS. BelikovE. MannelM. ViriusE. T. AtomssaE. T. AtomssaH. ValleDipak Kumar MishraA. BazilevskyD. E. FieldsK. WatanabeJ. ImrekR. AkimotoDipanwita DuttaZvi Hirsh CitronInkyu ParkS. TanejaM. J. TannenbaumM. JavaniB. V. JacakPeter ChristiansenA. DattaC. O. KimK. ShojiM. HeffnerC. GalH. ToriiK. NakanoXiong WangTomofumi NagaeKenneth Francis ReadKenneth Francis ReadJulia VelkovskaK. B. KimR. PakH. AsanoJ. L. NagleI. J. ChoiI. J. ChoiD. WinterT. IchiharaW. E. SondheimD. IvanischevJ. JinK. ImaiK. ImaiP. CasteraP. W. StankusM. MccumberM. MccumberC. H. ChenM. StepanovE. TennantM. RosatiAlexandre LebedevC. PinkenburgViktor RiabovViktor RiabovC. ValeC. ValeD. Yu PeressounkoN. GrauN. GrauE. M. TakaguiDong Jo KimTamás CsörgőN. RiveliT. V. MoukhanovaP. TarjánM. LeitgabR. S. TowellAjit Kumar MohantyT. A. ShibataC. L. SilvaC. L. SilvaA. ManionK. BoyleP. A. RukoyatkinK. OkadaK. KaratsuA. GarishviliT. SatoH. J. MoonL. BaksayAlice MignereyL. D'orazioS. MiyasakaG. RocheC. SilvestreI. RavinovichI. GarishviliI. GarishviliF. WeiY. HoriAnne Marie SicklesTadaaki IsobeJ. HanksA. Yu. SemenovY. NakamiyaD. LynchY. TsuchimotoY. TsuchimotoK. GaineyD. M. LeeA. A. VinogradovKyeongpil LeeMarisilvia DonadelliV. BumazhnovB. MeredithCharles MaguireSung Keun ParkTakao SakaguchiG. BaksayMotoi InabaX. BingO. ChvalaJ. S. BokJ. S. BokP. L. McgaugheyD. KotchetkovD. KotchetkovN. N. AjitanandH. En'yoM. BaiA. DionA. DionM. I. NagyA. D. FrawleyJiangyong JiaJiangyong JiaY. GotoS. ChoiJ. IdeR. M. WrightSeong H. KimJohn HillM. J. LeitchS. HuangE. C. AschenauerJ. P. WoodM. SarsourMate CsanadA. IordanovaR. TanabeJohannes Peter WesselsB. SahlmuellerB. SahlmuellerJ. G. LajoieTakahiro NakamuraG. R. YoungW. HolzmannAlexander MilovAlexander MilovHiromi IinumaC. Y. ChiY. J. KimT. Sugitate45T. HachiyaJ. E. FrantzJ. E. FrantzD. McglincheyD. McglincheyD. KleinjanK. V. DharmawardaneS. WhitakerK. KirilukI. NakagawaH. QuH. QuSenta GreeneR. LuechtenborgYoung-ki KimT. EngelmoreN. NovitzkyS. YokkaichiKiyoshi TanidaKiyoshi TanidaM. NihashiF. MatathiasA. KravitzY. OnukiSusumu OdaO. DrapierC. BaumannS. KametaniA. T. BasyeKensuke HommaE. RichardsonK. B. LeeY. J. MaoA. DurumM. S. DaugherityB. KomkovRushan HanC. P. SinghD. WatanabeFrank EllinghausDmitry BlauY. MiyachiJan RakZhiying YouZhiying YouHideki HamagakiK. AokiC. NattrassM. VargyasMartin PurschkeC. A. AidalaC. A. AidalaC. A. AidalaP. ConstantinB. M. JohnsonM. D. MalikR. LaceyB. FademE. VznuzdaevE. R. KinneyY. WatanabeFrançois FleuretR. P. PisaniD. P. MorrisonE. KistenevFilip KrizekR. BennettM. KawashimaJ. H. KangAtsushi TakaharaJ. S. HaggertyS. R. LeeR. Granier De CassagnacA. AdareE. O'brienD. HornbackG. DavidK. I. HahnL. DingK. A. DreesA. SterR. J. PettiR. J. PettiA. IsupovB. BassalleckM. KonnoS. CampbellB. H. KangY. J. KwonD. IsenhowerE. J. DesmondD. RoachK. M. KijimaNorio SaitoTsutomu MibeS. BatheS. BatheH. Al-ta'aniM. FingerTatsuya ChujoI. TserruyaJ. KlatskyS. WolinJ. SziklaiA. ToiaAgneta OskarssonYu. EfremenkoJ. YingA. FranzM. TogawaTakahiro FusayasuI. YounusI. YounusJongmin LeeJ. NewbyBrian ColeV. SinghN. KamiharaM. A. L. LeiteE. Vazquez-zambranoA. NederlofY. BerdnikovS. H. LeeY. AkibaY. S. LaiM. OuchidaAlexander MalakhovN. MeansC. MckinneyM. MishraJ. ParkS. NagamiyaK. DasE. P. HartouniByoungchoo ParkJ. S. KangS. H. LimVaclav VrbaVaclav VrbaKlaus Johannes ReygersJ. SunRui WeiD. SilvermyrM. NaglisM. KasaiH. PeiA. DreesA. TaketaniA. GlennA. GlennL. S. ZolinT. L. ThomasR. BelmontC. M. CamachoW. J. ParkJ. S. KapustinskyA. KissEunja KimChristopher RosenPrashant ShuklaT. KempelDong-hun KimV. BabintsevAaron AngeramiS. KanetiI. E. YushmanovEun-hee KimRyugo S. HayanoHenner BueschingSteve EdwardsSteve EdwardsA. YanovichY. RiabovY. RiabovKenta ShigakiM. ChiuS. F. PateX. JiangM. NguyenTaku GunjiH. GongJ. SeeleC. A. OgilvieM. SoumyaX. GongKe. NakamuraA. S. NyaninT. K. HemmickMarcus HohlmannJ. M. DurhamJ. M. DurhamYasuo MiakeRachid NouicerA. N. ZelenskiM. ProisslF. KajiharaW. A. ZajcTorsten DahmsH. ThemannL. KochendaM. IssahL. A. Linden LevyH. J. KimC. L. WoodyA. BerdnikovJ. MurataH. Al-batainehP. RosnetV. BaublisA. TaranenkoA. TaranenkoK. O. EyserA. K. PurwarK. FujiwaraGerd Joachim KundeI. SheinA. DenisovYuki WatanabeK. SakashitaD. KotovD. KotovY. L. YamaguchiA. V. KazantsevK. SedgwickV. CiancioloY. KomatsuKazushi MikiMihael MakekMihael MakekD. S. JumperD. S. JumperE. LeitnerS. ButsykS. ButsykJ. HamblenT. HoraguchiT. HoraguchiJason KaminI. V. SourikovaBrajesh K. SinghSergey FokinS. P. StollL. TomášekP. MikešP. MikešSoren Pontoppidan SorensenS. MotschwillerH. W. Van HeckeA. MorrealeS. S.e. RosendahlZ. FraenkelR. K. ChoudhuryK. S. JooA. RakotozafindrabeN. ApadulaA. VossenS. EsumiD. SharmaR. IchimiyaG. BunceS. ZhouS. TarafdarD. IvanishchevB. AzmounL. PatelA. KrálD. JouanV. PapavassiliouT. C. AwesKyoichiro OzawaT. LiškaEva HaslumB. LenziM. OkaP. KlineK. S. LeeP. LiebingS. D. RolnickBum-hoon LeeM. WysockiB. BannierK. YamauraK. HashimotoXingguo LiB. Lovesubject
PhysicsNuclear and High Energy PhysicsRange (particle radiation)Exponential distributionPhoton010308 nuclear & particles physicsInverse01 natural sciencesMomentumNuclear physicsYield (chemistry)0103 physical sciencesHigh Energy Physics::ExperimentAtomic physicsNuclear Experiment010306 general physicsCentralityScalingdescription
The PHENIX experiment at RHIC has measured the centrality dependence of the direct photon yield from Au+Au collisions at sNN−−−√=200 GeV down to pT=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 pT. We find an excess of direct photons above the Ncoll-scaled yield measured in p+p collisions. This excess yield is well described by an exponential distribution with an inverse slope of about 240MeV/c in the pT range 0.6–2.0 GeV/c. While the shape of the pT distribution is independent of centrality within the experimental uncertainties, the yield increases rapidly with increasing centrality, scaling approximately with Nαpart, where α=1.38±0.03(stat)±0.07(syst).
year | journal | country | edition | language |
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2015-06-05 | Physical Review C |