Jet quenching and neutral pion production in Au+Au collisions at RHIC

الأصل · EN

In the jet quenching model, we have analysed the PHENIX data on nuclear modification factor of π⁰, in Au+Au collisions at √s=200 GeV, and extracted the initial gluon density of the medium produced. In jet quenching, partons lose energy in the medium, depending on the medium density as well as on the in-medium path length. Systematic analysis indicate that in most central (0-10% centrality) collisions, medium density is very large dNg/dy 2150. Medium density decreases exponentially as the collision centrality decreases and in very peripheral (70-92% centrality) collisions, dNg/dy 3. Initial energy density of the medium also decreases smoothly from ε₀ 20 GeV/fm³ in most central collisions to ε₀ 3 GeV/fm³ in most peripheral collisions. Very large dNg/dy or ε₀ indicate very dense matter formation in central Au+Au collisions.