对比大型系统与小型系统中的冻结
Contrasting Freezeouts in Large Versus Small Systems
摘要：
本文研究了在大型强子对撞机（LHC）能量下p+p、p+Pb和Pb+Pb的平均强子产额数据，并对比了它们的化学冻结条件。我们研究了几个冻结方案，主要是不同的方式对待陌生化：i。奇异性与完全平衡的非奇异强子一起冻结（1CFO），ii.奇异性与非奇异性强子一起冻结，其中附加参数$γ_S$说明奇异性的非平衡产生（1CFO+ $γ_S$），以及iii.奇异强子在热平衡中比非奇异强子更早冻结。的拟合的卡方比较表明系统大小的冻结计划的依赖性。最小偏置p+p和p+Pb与外围Pb+Pb数据的不同中心倾向于1CFO $+γ_S$，当我们从p+p到中心p+Pb和外围Pb+Pb时，$γ_S$接近1。另一方面，中部到中部Pb+Pb数据更倾向于2CFO而不是1CFO+ $γ_S$。这种体系尺寸依赖性的冻结方案可能是一个额外的相互作用在铅+铅比p+铅和p+ p的指示。
英文摘要：
We study the data on mean hadron yields and contrast the chemical freezeout conditions in p+p, p+Pb and Pb+Pb at the Large Hadron Collider (LHC) energies. We study several schemes for freezeout that mainly differ in the way strangeness is treated: i. strangeness freezes out along with the non-strange hadrons in complete equilibrium (1CFO), ii. strangeness freezes out along with non-strange hadrons with an additional parameter $γ_S$ accounting for non-equilibrium production of strangeness (1CFO+$γ_S$), and iii. strangeness freezes out earlier than non-strange hadrons and in thermal equilibrium (2CFO). A comparison of the chisquares of the fits indicate a dependence of the freezeout scheme on the system size. The minimum bias p+p and different centralities of p+Pb and peripheral Pb+Pb data prefer 1CFO$+γ_S$ with $γ_S$ approaching unity as we go from p+p to central p+Pb and peripheral Pb+Pb. On the other hand, the mid-central to central Pb+Pb data prefer 2CFO over 1CFO+$γ_S$. Such system size dependence of freezeout scheme could be an indication of the additional interaction in Pb+Pb over p+Pb and p+p.
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