Oak Ridge National Laboratory

Physics Division

Physics Division Seminars

Physics Division Seminars bring us speakers on a variety of physics related subjects. Usually these are held in the Building 6008 large Conference Room, at 3:00 pm on the chosen day, but times and locations may vary. For more information, contact our seminar chairman,

Alfredo Galindo-Uribarri
Tel (Office): (865) 574-6124  (FAX): (865) 574-1268

Thu., August 19, 2004, at 3:00 p.m.

Jet Quenching at RHIC and the Baryon Puzzle

Julia Velkovska, Vanderbilt University
6008 Conference Room

At the Relativisic Heavy Ion Collisder (RHIC), Au-Au collisions at sqrt(s) = 200 GeV produced nuclear matter at the highest temperatures and energy densities yet achieved in laboratory conditions. The goal is to search for signatures of deconfinement and chiral symmetry restoration and to study the transition from normal to deconfined nuclear matter by utilizing a wide variety of probes. One of the most convincing evedencies for Quark Gluon Plasma comes form hard scattering processes which probe the earliest stages of the collisions. Jet quenching from the dense plasma was discovered for mesons and inclusive charged hadrons. Surprisingly, baryons appear unsupressed in the measured range. Recent theoretical development explains the baryon/meson behavior by invoking a quark-recombination from the deconfined phase making this feature a direct signature for partonic degrees of freedom. The latest experimental results on this subject will be presented.