标题： 重离子碰撞实验中化学冻结参数的系统学 显示英文标题

标题： Systematics of chemical freeze-out parameters in heavy-ion collision experiments

摘要： 我们讨论了在重离子碰撞实验中，通过$\chi^2$分析强子多重性比值时，化学冻结参数的系统不确定性。 由于选择特定强子比值引起的系统性误差位于实验不确定性范围内。 通过去除对守恒电荷的通常约束所获得的变异表现出类似的行为。 在这种无约束系统中的净电荷与净重子比值与从碰撞核子的质子和中子得到的预期值相一致，直到质心系能量$\sim 40$GeV。 超过这一点，该比值的不确定性逐渐增加，可能表明重子停止作用的减少。 显示英文摘要

摘要： We discuss systematic uncertainties in the chemical freeze-out parameters from the $\chi^2$ analysis of hadron multiplicity ratios in the heavy-ion collision experiments. The systematics due to the choice of specific hadron ratios are found to lie within the experimental uncertainties. The variations obtained by removing the usual constraints on the conserved charges show similar behavior. The net charge to net baryon ratios in such unconstrained systems are commensurate with the expected value obtained from the protons and neutrons of the colliding nuclei up to the center of mass energies $\sim 40$ GeV. Beyond that the uncertainties in this ratio gradually increases, possibly indicating the reduction in baryon stopping.