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.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC); National Science Foundation (NSF); FOR
- DOE Contract Number:
- DE-AC02-06CH11357
- OSTI ID:
- 949560
- Report Number(s):
- ANL/PHY/JA-42003; PRAMCI; TRN: US1003577
- Journal Information:
- PRAMAMA - J. Phys., Vol. 60, Issue 5 ; May 2003; Conference: International Conference on Physics and Astro-Physics of Quark-Gluon Plasma; Nov. 26, 2001 - Nov. 30, 2001; Jaipur, India; ISSN 0304-4289
- Country of Publication:
- United States
- Language:
- ENGLISH
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