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

Fri., August 13, 2004, at 10:30 a.m.

Antiparticle to Particle Ratios in d+Au and p+p Collisions & Baryon Transport in PHOBOS

Abigail Bickley, University of Maryland
6025 Room 8N (Small Conference Room)

Comparisons of d+Au and Au+Au data suggest that the conditions in Au+Au collisions are very different from those observed in d+Au collisions. Whether these different conditions influence the relative yields of antiparticles and particles for primary charged pions, kaons, and protons will be explored by comparing the antiparticle to particle ratios measured in the Au+Au system with those from d+Au and p+p collisions. The PHOBOS detector at the Relativistic Heavy Ion Collider at Brookhaven National Laboratory has a two-arm magnetic spectrometer, consisting of planes of highly segmented silicon pads, that provides particle tracking and identification at mid-rapidity. Centrality is well determined using the 4pi multiplicity detector and forward calorimetry. With this information it is possible to measure the centrality dependence of the antiparticle to particle ratios. Results from 200-GeV Au+Au, d+Au and p+p collisions measured in the PHOBOS spectrometer will be presented. The implications of these results on baryon transport will be discussed.

host: Vince Cianciolo