Centrality dependence of low-momentum direct-photon production in Au+Au collisions at s NN =200 GeV CENTRALITY DEPENDENCE of LOW-MOMENTUM DIRECT- ... A. ADARE et al.

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Title:	Centrality dependence of low-momentum direct-photon production in Au+Au collisions at s NN =200 GeV CENTRALITY DEPENDENCE of LOW-MOMENTUM DIRECT- ... A. ADARE et al.
Authors:	彭仁傑;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, Cédric;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.;Muñoz Camacho, C.;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. S.;David, G.;Denisov, A.;Deshpande, A.;Desmond, E. J.;Dharmawardane, K. V.;Dietzsch, O.;Ding, L.;Dion, A.;Donadelli, M.;Drapier, O.;Drees, A.;Drees, K. A.;Durham, J. M.;Durum, A.;Dutta, D.;d'Orazio, L.;Edwards, S.;Efremenko, Y. V.;Ellinghaus, F.;Engelmore, T.;Enokizono, A.;En'Yo, H.;Esumi, S.;Eyser, K. O.;Fadem, B.;Fields, D. E.
Contributors:	高能與強場物理研究中心
Keywords:	Fysik;Natural Sciences;Naturvetenskap;Nuclear Experiment;Physical Sciences;Physics;Subatomic Physics;Subatom�r fysik
Date:	2015-06-05
Issue Date:	2026-04-23 11:59:59 (UTC+8)
Publisher:	American Physical Society
Abstract:	摘要： 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). 出版者： American Physical Society 出版日期： 2015-06 出處： Physical review. C, 2015-06, Vol.91 (6) 版權： licence_http://creativecommons.org/publicdomain/zero 識別號： ISSN: 2469-9985 識別號： ISSN: 0556-2813 識別號： ISSN: 1089-490X 識別號： EISSN: 2469-9993 識別號： DOI: 10.1103/PhysRevC.91.064904
Appears in Collections:	[Center for High Energy and High Field Physics (CHiP)] journal & Dissertation

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