Centrality Dependence of Direct Photon Production in {radical}(S{sub NN})=200 GeV Au+Au Collisions

The first measurement of direct photons in Au+Au collisions at {radical}(s{sub NN})=200 GeV is presented. The direct photon signal is extracted as a function of the Au+Au collision centrality and compared to next-to-leading order perturbative quantum chromodynamics calculations. The direct photon yi...

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Bibliographic Details
Published in:Physical review letters 2005-06, Vol.94 (23)
Main Authors: Adler, S.S., Aidala, C., Aronson, S.H., Chujo, T., David, G., Desmond, E.J., Ewell, L., Franz, A., Guryn, W., Haggerty, J.S., Harvey, M., Johnson, B.M., Kistenev, E., Kroon, P.J., Makdisi, Y.I., Mioduszewski, S., Mitchell, J.T., Morrison, D.P., O'Brien, E., Pinkenburg, C.
Format: Article
Language:English
Subjects:
COLLIDING BEAMS
COLLISIONS
GEV RANGE 100-1000
GOLD 197 BEAMS
GOLD 197 REACTIONS
GOLD 197 TARGET
NUCLEAR PHYSICS AND RADIATION PHYSICS
NUCLEON-NUCLEON INTERACTIONS
PARTICLE PRODUCTION
PHOTONS
QUANTUM CHROMODYNAMICS
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Summary:The first measurement of direct photons in Au+Au collisions at {radical}(s{sub NN})=200 GeV is presented. The direct photon signal is extracted as a function of the Au+Au collision centrality and compared to next-to-leading order perturbative quantum chromodynamics calculations. The direct photon yield is shown to scale with the number of nucleon-nucleon collisions for all centralities.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.94.232301