@article{8a8e4c012aa94a4ba969e128656edfe0,
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.",
abstract = "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 Npartα, where α=1.38±0.03(stat)±0.07(syst).",
author = "{PHENIX Collaboration} and A. Adare and S. Afanasiev and C. Aidala and Ajitanand, {N. N.} and Y. Akiba and R. Akimoto and H. Al-Bataineh and H. Al-Ta'Ani and J. Alexander and A. Angerami and K. Aoki and N. Apadula and Y. Aramaki and H. Asano and Aschenauer, {E. C.} and Atomssa, {E. T.} and R. Averbeck and Awes, {T. C.} and B. Azmoun and V. Babintsev and M. Bai and G. Baksay and L. Baksay and B. Bannier and Barish, {K. N.} and B. Bassalleck and Basye, {A. T.} and S. Bathe and V. Baublis and C. Baumann and S. Baumgart and A. Bazilevsky and S. Belikov and R. Belmont and R. Bennett and A. Berdnikov and Y. Berdnikov and Bickley, {A. A.} and X. Bing and Blau, {D. S.} and Bok, {J. S.} and K. Boyle and Brooks, {M. L.} and H. Buesching and V. Bumazhnov and G. Bunce and S. Butsyk and Camacho, {C. M.} and S. Campbell and Z. Citron",
note = "Publisher Copyright: {\textcopyright} 2015 American Physical Society.",
year = "2015",
month = jun,
day = "5",
doi = "10.1103/PhysRevC.91.064904",
language = "English",
volume = "91",
journal = "Physical Review C - Nuclear Physics",
issn = "0556-2813",
publisher = "American Physical Society",
number = "6",
}