Evidence for a Quark-Gluon Plasma at Rhic

Details Evidence for a Quark-Gluon Plasma at Rhic Evidence for a Quark-Gluon Plasma at Rhic

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006fuin.conf...33h&link_type=abstract

FUNDAMENTAL INTERACTIONS. Proceedings of the 21st Lake Louise Winter Institute. Held 17-23 February 2006 in Lake Louise, Alberta

Physics

Scientific paper

Ultra-relativistic collisions of heavy nuclei at the Relativistic Heavy Ion Collider (RHIC) form an extremely hot system at energy densities greater than 5 GeV/fm3, where normal hadrons cannot exist. Upon rapid cooling of the system to a temperature T ~ 175 MeV and vanishingly small baryo-chemical potential, hadrons coalesce from quarks at the quark-hadron phase boundary predicted by lattice QCD. A large amount of collective (elliptic) flow at the quark level provides evidence for strong pressure gradients in the initial partonic stage of the collision when the system is dense and highly interacting prior to coalescence into hadrons. The suppression of both light (u, d, s) and heavy (c, b) hadrons at large transverse momenta, that form from fragmentation of hard-scattered partons, and the quenching of di-jets provide evidence for extremely large energy loss of partons as they attempt to propagate through the dense, strongly-coupled, colored medium created at RHIC.

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