skip to main content

Title: A first look at Au+Au collisions at RHIC energies using the PHOBOS detector.

The PHOBOS detector has been used to study Au + Au collisions at {radical}sNN = 56,130, and 200 GeV Several global observables have been measured and the results are compared with theoretical models. These observables include the charged-particle multiplicity measured as a function of beam energy, pseudo-rapidity, and centrality of the collision. A unique feature of the PHOBOS detector is its almost complete angular coverage such that these quantities can be studied over a pseudo-rapidity interval of |{eta}|{<=}5.4. This allows for an almost complete integration of the total charged particle yield, which is found to be about N{sub ch}{sup tot} = 4200 {+-}470 at {radical}sNN = 130 GeV and N{sub ch}{sup tot} = 5300 {+-}530 at {radical}sNN = 200 GeV. The ratio of anti-particles to particles emitted in the mid-rapidity region has also been measured using the PHOBOS magnetic spectrometer. Of particular interest is the ratio of anti-protons to protons in the mid-rapidity region, which was found to be (i.e.921-1) at {radical}sNN = 130 GeV. This high value suggests that an almost baryon-free region has been produced in the collisions.
Authors:
; ; ; ; ; ;
Publication Date:
OSTI Identifier:
949560
Report Number(s):
ANL/PHY/JA-42003
Journal ID: ISSN 0304-4289; PRAMCI; TRN: US1003577
DOE Contract Number:
DE-AC02-06CH11357
Resource Type:
Journal Article
Resource Relation:
Journal Name: PRAMAMA - J. Phys.; Journal Volume: 60; Journal Issue: 5 ; May 2003; Conference: International Conference on Physics and Astro-Physics of Quark-Gluon Plasma; Nov. 26, 2001 - Nov. 30, 2001; Jaipur, India
Research Org:
Argonne National Laboratory (ANL)
Sponsoring Org:
SC; NSF; FOR
Country of Publication:
United States
Language:
ENGLISH
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; CHARGED PARTICLES; MAGNETIC SPECTROMETERS; MULTIPLICITY; PHYSICS; PROTONS; QUARK MATTER