Measurement of direct photons in Au + Au collisions at $sqrt{s_{NN}}$ = 200 GeV

Afanasiev, S.*; Imai, Kenichi; Sato, Susumu ; Tanida, Kiyoshi ; PHENIX Collaboration*

We report the measurement of direct photons at midrapidity in Au + Au collisions at $sqrt{s_{NN}}$ = 200 GeV. The direct photon signal was extracted for the transverse momentum range of 4 GeV/c 22 GeV/c, using a statistical method to subtract decay photons from the inclusive photon sample. The nuclear modification factor $R_{rm AA}$ for the direct photons was calculated for different Au + Au collision centralities using the direct photon spectrum. $R_{rm AA}$ was found to be consistent with unity for all centralities and over the entire measured range.

Language	:	English
Journal	:	Physical Review Letters
Volume	:	109
Number	:	15
Pages	:	p.152302_1 - 152302_7
Publication Year/Month	:	2012/10
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Paper URL	:	https://doi.org/10.1103/PhysRevLett.109.152302
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Keywords	:	no keyword
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Registration No. : AA20120771
JAEA Abstracts No. : 41000168
Paper Submission No. : 11773

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Measurement of direct photons in Au + Au collisions at = 200 GeV

Measurement of direct photons in Au + Au collisions at $sqrt{s_{NN}}$ = 200 GeV