System size and flavour dependence of chemical freeze-out temperatures in ALICE data from pp, pPb and PbPb collisions at LHC energies

System size and flavour dependence of chemical freeze-out temperatures in ALICE data from pp, pPb and PbPb collisions at LHC energies
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LHC 能量下 pp、pPb 和 PbPb 碰撞的 ALICE 数据中化学冻结温度的系统尺寸和风味依赖性

DOI:
10.1016/j.physletb.2022.137473
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发表时间:
2022
期刊:
影响因子:
4.4
通讯作者:
Bellwied, René
Bellwied, René
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Flor, Fernando Antonio;Olinger, Gabrielle;Bellwied, René

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我们给出了在pp、ppb和pbb碰撞中,通过热拟合法计算的化学冻结温度(Tch)随体系大小和风味的变化与实验产率的关系。利用热拳强子共振气体模型包,比较了不同冻结条件下奇异性守恒不同处理的拟合质量随带电粒子多重数密度<dNch/dη>的变化。此外,我们还考察了反强子与介子之比、光重子和奇异重子的产额比以及ϕ介子在味相关模型中的演化过程。通过一种独特的双温化学冻结方法,我们证明了奇异正则系综中Tch的气味依赖性导致了在LHC能量下从小到大系统的奇异性增强的自然解释,而不需要在小<d N ch/dη>产生任何非平衡粒子。
We present the system size and flavour dependence of the chemical freeze-out temperature (T ch) at vanishing baryo-chemical potential calculated via thermal fits to experimental yields for several multiplicity classes in pp, pPb and PbPb collisions measured by ALICE. Using the Thermal-FIST Hadron Resonance Gas model package, we compare the quality of fits across various treatments of strangeness conservation under different freeze-out conditions as a function of the charged particle multiplicity density< d N ch/d η>. Additionally, we examine how the anti-hadron to pion yield ratios of light and strange baryons, as well as the ϕ meson, evolve within a flavour-dependent model. Through a unique two-temperature chemical freeze-out approach, we show that flavour dependence of T ch in a Strangeness Canonical Ensemble leads to a natural explanation of strangeness enhancement from small to large systems at LHC energies without requiring any non-equilibrium particle production at small< d N ch/d η>.
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