[Triumf-seminars] TRIUMF Seminar today at 14:00

[postmaster@admin.triumf.ca]

---------------------- multipart/mixed attachment
Date/Time: Wed 2003-06-25 at 14:00

Location:  Auditorium          

Speaker:   Carl Gagliardi (Texas A&M)

Title:     Jet quenching  at RHIC

Abstract: Partonic energy loss is a potential tool to measure the density of the medium produced in relativistic heavy-ion collisions at RHIC.  Several possible signatures of partonic energy loss have been observed in central Au+Au collisions at $\sqrt{s_{NN}}$ = 130 and 200 GeV.  These include strong suppression of the yield of high-$p_T$ hadrons relative to expectations from binary-scaled p+p collisions, isappearance of back-to-back high-$p_T$ hadron pairs, and sizable azimuthal anisotropies in the production of high-$p_T$ hadrons.  These observations are consistent with pQCD models that incorporate partonic energy loss in a medium that may be 30 times nuclear matter density.  However, other explanations involving saturation of the gluon density in the Au nucleus wave function have also been proposed.  Recently, RHIC studied d+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV, which should be sensitive to similar initial-state effects as in Au+Au collisions.  High-$p_T$ hadron production is found to be enhanced in d+Au collisions, and the distribution of back-to-back high-$p_T$ hadron pairs is little changed from p+p collisions.  These results demonstrate that the strong suppression of high-$p_T$ hadrons observed in central Au+Au collisions is due to final-state interactions with the dense medium generated in such collisions.

Stimulants available 15 minutes before the talk.

______________________________

Subscription information available at http://admin.triumf.ca/netdata/seminars/list


---------------------- multipart/mixed attachment--