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arXiv 0710.3902nucl-ex
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RHIC的奇异性和整体冻结特性

Strangeness and bulk freeze-out properties at RHIC

Aneta Iordanova

摘要:

为了探索RHIC中奇异态的产生并表征所产生系统的体冻结性质,利用流体驱动的冲击波和统计模型框架研究了sqrt(sNN)= 200和62.4GeV Cu+Cu碰撞中确定的带电K介子、π介子和质子谱和比率.在中快度|y| <0.1,横动量0.25 < p_T < 1.2 GeV/c范围内测量了能谱,并利用STAR时间投影室的电离能损失进行了粒子鉴别。利用多维系统研究了Cu+Cu、Au+Au、d+Au和p+p碰撞中π(+/-)、K(+/-)、p和pbar的产生,讨论了冻结参数和奇异产生的能量、系统尺寸和推断的能量密度依赖关系. Cu+Cu碰撞的新数据弥合了较小的d+Au和较大的Au+Au系统之间的差距,从而可以详细研究RHIC奇异平衡的发生。

英文摘要:

Identified charged kaon, pion, and proton spectra and ratios from sqrt(s_NN) = 200 and 62.4 GeV Cu+Cu collisions are studied with a hydro-motivated blast-wave and a statistical model framework in order to explore the strangeness production at RHIC and characterize the bulk freeze-out properties of the created system. The spectra are measured at mid-rapidity |y|<0.1 over the transverse momentum range of 0.25 < p_T < 1.2 GeV/c with particle identification derived from the ionization energy loss in the STAR Time Projection Chamber. The multi-dimensional systematic study of pi(+/-), K(+/-), p and pbar production in Cu+Cu, Au+Au, d+Au and p+p collisions is used to discuss the energy, system size and inferred energy density dependence of freeze-out parameters and strangeness production. The new data from Cu+Cu collisions bridge the gap between the smaller d+Au and larger Au+Au systems, allowing a detailed study of the onset of strangeness equilibration at RHIC.

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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