We have estimated centrality variation of chemical freeze-out parameters from yield data at midrapidity of , and , for collision energies of RHIC (Relativistic Heavy Ion Collider), Beam Energy Scan (RHIC-BES) program, and LHC (Large Hadron Collider). We have considered a simple hadron resonance gas model and employed a formalism involving conserved charges () of QCD for parameterization. Along with temperature and three chemical potentials (), a strangeness undersaturation factor () has been used to incorporate the partial equilibration in the strange sector. Our obtained freeze-out temperature does not vary much with centrality, whereas chemical potentials and seem to have a significant dependence. The strange hadrons are found to deviate from a complete chemical equilibrium at freeze-out at the peripheral collisions. This deviation appears to be more prominent as the collision energy decreases at lower RHIC-BES energies. We have also shown that this departure from equilibrium reduces towards central collisions, and strange particle equilibration may happen after a threshold number of participants in - collision.

中文翻译：

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RHIC和LHC能量中化学冻结参数的中心依赖性和奇异性平衡

我们估计从产量数据在midrapidity化学冻结输出参数中心地位的变化，并且，对于RHIC（相对论重离子对撞机），束流能量扫描（RHIC-BES）程序，LHC（大型强子对撞机）的碰撞能量。我们考虑了一个简单的强子共振气体模型，并采用了涉及守恒电荷的形式主义（ ） QCD的参数化。以及温度和三种化学势（）中，已使用奇数不饱和度因子（）将部分平衡纳入奇数扇区。我们获得的冻结温度随中心度变化不大，而化学势似乎有很大的依赖性。发现奇怪的强子在外围碰撞时在冻结时偏离了完整的化学平衡。当在较低的RHIC-BES能量下碰撞能量降低时，这种偏差似乎更加突出。我们还表明，从这个平衡出发去中心碰撞减少和奇异粒子平衡可以参加的阈值数后发生-冲突。