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arXiv 0709.0665nucl-th
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相对论性核碰撞中的多重数涨落

Multiplicity fluctuations in relativistic nuclear collisions

M. Hauer, V. V. Begun, M. Gazdzicki, M. I. Gorenstein, V. P. Konchakovski, B. Lungwitz

摘要:

在强子-共振气体模型的大体积极限下,研究了中心核-核碰撞中产生的强子多重数分布。在正则系综中,三个电荷(重子数、电荷和奇异性)的守恒是强制的。此外,在微正则系综能量守恒。一种分析方法是用来占共振衰减。本文给出了从SIS到LHC能量范围内Pb+Pb(Au+Au)碰撞中心化学冻结线上的负电荷强子多重数分布和标度方差。在不同的统计合奏得到的预测进行了比较与初步的NA 49中心Pb+Pb碰撞的SPS能量范围内的实验结果。测得的波动显着窄于泊松参考分布,显然有利于预期的微正则系综。

英文摘要:

Multiplicity distributions of hadrons produced in central nucleus-nucleus collisions are studied within the hadron-resonance gas model in the large volume limit. In the canonical ensemble conservation of three charges (baryon number, electric charge, and strangeness) is enforced. In addition, in the micro-canonical ensemble energy conservation is included. An analytical method is used to account for resonance decays. Multiplicity distributions and scaled variances for negatively charged hadrons are presented along the chemical freeze-out line of central Pb+Pb (Au+Au) collisions from SIS to LHC energies. Predictions obtained within different statistical ensembles are compared with preliminary NA49 experimental results on central Pb+Pb collisions in the SPS energy range. The measured fluctuations are significantly narrower than a Poisson reference distribution, and clearly favor expectations for the micro-canonical ensemble.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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