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dc.contributor.authorAdare, Andrew Marshall
dc.contributor.authorAfanasiev, Sergey V.
dc.contributor.authorAidala, Christine A.
dc.contributor.authorAjitanand, N. N.
dc.contributor.authorAkiba, Yasuyuki
dc.contributor.authorAkimoto, R.
dc.contributor.authorAl-Bataineh, H.
dc.contributor.authorBaksay, Gyöngyi
dc.contributor.authorBaksay, László A.
dc.contributor.authorHohlmann, Marcus
dc.date.accessioned2017-03-14T14:43:52Z
dc.date.available2017-03-14T14:43:52Z
dc.date.issued2015-06-05
dc.identifier.citationAdare, A., Afanasiev, S., Aidala, C., Ajitanand, N. N., Akiba, Y., Akimoto, R., ... & Aoki, K. (2015). Centrality dependence of low-momentum direct-photon production in Au+ Au collisions at s N N= 200 GeV. Physical Review C, 91(6), 064904.en_US
dc.identifier.urihttp://hdl.handle.net/11141/1219
dc.description.abstractThe 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 Nᵃpart, where α=1.38±0.03(stat)±0.07(syst).en_US
dc.language.isoen_USen_US
dc.rightsThis published article is made available in accordance with publishers policy. It may be subject to U.S. copyright law.en_US
dc.rights.urihttps://journals.aps.org/info/terms.htmlen_US
dc.titleCentrality dependence of low-momentum direct-photon production in Au+Au collisions at √sNN =200 GeVen_US
dc.typeArticleen_US
dc.identifier.doi10.1103/PhysRevC.91.064904


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