Y.Miake, 6th China-Japan Joint
Nuclear Physics Symposium, Shanghai, May 16-20, 2006
22
Study of direct photon
lPi-zero results consistent with
other mesons
lNo significant diff. btwn
inclusive v2 and expected photon v2 from hadronic decay (pion,
eta, etc)
lDirect photons are from
compton-like “prompt” process?
0.0
0.1
0.2
v2
R; direct photon excess
ratio
0.0
0.1
0.2
v2
PHENIX, PRL
96,032302(2006)