摘要
The PHOBOS detector has been used to study Au + Au collisions at √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 |η| ≤ 5.4. This allows for an almost complete integration of the total charged particle yield, which is found to be about Nchtot = 4200 ± 470 at √SNN = 130 GeV and Nchtot = 5300 ± 530 at √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 p̄/p = 0.6 ± 0.04(stat) ± 0.06(syst) at √SNN = 130 GeV. This high value suggests that an almost baryon-free region has been produced in the collisions.
原文 | ???core.languages.en_GB??? |
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頁(從 - 到) | 921-931 |
頁數 | 11 |
期刊 | Pramana - Journal of Physics |
卷 | 60 |
發行號 | 5 |
DOIs | |
出版狀態 | 已出版 - 5月 2003 |
事件 | Proceedings of the International Conference on Physics and Astrophysics of Quark-Gluon Plasma - Part II - Jaipur, India 持續時間: 26 11月 2001 → 30 11月 2001 |