Y.Miake, 6th China-Japan Joint Nuclear Physics Symposium, Shanghai, May 16-20, 2006
13
Other surprise; baryon dominance
lWe had many reasons to consider > 2GeV/c is the jet region.
lIn peripheral, p/p ratio similar to those in ee/pp suggesting fragmentaton process.
lFragmentation process should show np < np as seen in ee/pp.
lIn central Au+Au, p/p ratio increases with centrality, suggesting other mechanism.
Phenix; P.R.L. 91(2003)172301
ê
Quark Recombination Model
(Quark Coalescence Model)
é
High resolution
Time-of flight detector