Y.Miake, 6th China-Japan Joint
Nuclear Physics Symposium, Shanghai, May 16-20, 2006
11
v2 with particle identification
lLow pt region;
l v2(p)
> v2(K) > v2(p)
lMass Ordering
lGood agreement with hydrodynamics
lVery early thermalization (0.6 fm/c) & high energy density (~20 GeV/fm3)
required !
§èMore from Hirano’s
talk
lPerfect fluid (low viscous)
lWhat brings the system thermalization in such a short time!
§èPartonic degree of
freedom
lDeviations at high pt region
(> 1.5 GeV/c);
(> 1.5 GeV/c);
l v2(p,K)
< v2(p)
lMeson vs Baryon?
lOther mechanism?
PHENIX : P.R.L. 91,
182301 (2003)
PHENIX Preliminary : Masui@QM05