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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.

Publication ,  Journal Article
Adare, A; Afanasiev, S; Aidala, C; Ajitanand, NN; Akiba, Y; Akimoto, R; Al-Bataineh, H; Al-Ta'Ani, H; Alexander, J; Angerami, A; Aoki, K ...
Published in: Physical Review C - Nuclear Physics
June 5, 2015

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).

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Published In

Physical Review C - Nuclear Physics

DOI

EISSN

1089-490X

ISSN

0556-2813

Publication Date

June 5, 2015

Volume

91

Issue

6

Related Subject Headings

  • Nuclear & Particles Physics
  • 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics
 

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Adare, A., Afanasiev, S., Aidala, C., Ajitanand, N. N., Akiba, Y., Akimoto, R., … Fields, D. E. (2015). 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. Physical Review C - Nuclear Physics, 91(6). https://doi.org/10.1103/PhysRevC.91.064904
Adare, A., S. Afanasiev, C. Aidala, N. N. Ajitanand, Y. Akiba, R. Akimoto, H. Al-Bataineh, et al. “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.Physical Review C - Nuclear Physics 91, no. 6 (June 5, 2015). https://doi.org/10.1103/PhysRevC.91.064904.
Adare A, Afanasiev S, Aidala C, Ajitanand NN, Akiba Y, Akimoto R, et al. 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. Physical Review C - Nuclear Physics. 2015 Jun 5;91(6).
Adare, A., et al. “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.Physical Review C - Nuclear Physics, vol. 91, no. 6, June 2015. Scopus, doi:10.1103/PhysRevC.91.064904.
Adare A, Afanasiev S, Aidala C, Ajitanand NN, Akiba Y, Akimoto R, Al-Bataineh H, Al-Ta’Ani H, Alexander J, Angerami A, Aoki K, Apadula N, Aramaki Y, Asano H, Aschenauer EC, Atomssa ET, Averbeck R, Awes TC, Azmoun B, Babintsev V, Bai M, Baksay G, Baksay L, Bannier B, Barish KN, Bassalleck B, Basye AT, Bathe S, Baublis V, Baumann C, Baumgart S, Bazilevsky A, Belikov S, Belmont R, Bennett R, Berdnikov A, Berdnikov Y, Bickley AA, Bing X, Blau DS, Bok JS, Boyle K, Brooks ML, Buesching H, Bumazhnov V, Bunce G, Butsyk S, Camacho CM, Campbell S, Castera P, Chen CH, Chi CY, Chiu M, Choi IJ, Choi JB, Choi S, Choudhury RK, Christiansen P, Chujo T, Chung P, Chvala O, Cianciolo V, Citron Z, Cole BA, Connors M, Constantin P, Csanád M, Csörgo T, Dahms T, Dairaku S, Danchev I, Das K, Datta A, Daugherity MS, David G, Denisov A, Deshpande A, Desmond EJ, Dharmawardane KV, Dietzsch O, Ding L, Dion A, Donadelli M, Drapier O, Drees A, Drees KA, Durham JM, Durum A, Dutta D, D’Orazio L, Edwards S, Efremenko YV, Ellinghaus F, Engelmore T, Enokizono A, En’Yo H, Esumi S, Eyser KO, Fadem B, Fields DE. 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. Physical Review C - Nuclear Physics. 2015 Jun 5;91(6).

Published In

Physical Review C - Nuclear Physics

DOI

EISSN

1089-490X

ISSN

0556-2813

Publication Date

June 5, 2015

Volume

91

Issue

6

Related Subject Headings

  • Nuclear & Particles Physics
  • 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics