Parton Coalescence and the Antiproton/Pion Anomaly at RHIC
Vincenzo GrecoCyclotron Institute and Physics Department, Texas A&M University, College Station, Texas 77843-3366, USAChe Ming KoCyclotron Institute and Physics Department, Texas A&M University, College Station, Texas 77843-3366, USAP. LévaiCyclotron Institute and Physics Department, Texas A&M University, College Station, Texas 77843-3366, USA
2003en
ABI
Annotatsiya
Coalescence of minijet partons with partons from the quark-gluon plasma formed in relativistic heavy ion collisions is suggested as the mechanism for production of hadrons with intermediate transverse momentum. The resulting enhanced antiproton and pion yields at intermediate transverse momenta give a plausible explanation for the observed large antiproton to pion ratio. With further increasing momentum, the ratio is predicted to decrease and approach the small value given by independent fragmentations of minijet partons after their energy loss in the quark-gluon plasma.
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