"MuB vs 39" of "Bulk Properties of the Medium Produced in Relativistic Heavy-Ion Collisions from the Beam Energy Scan Program"

"Choice on constraints: Extracted chemical freeze-out temperatures shown in panels (a), (c), and (e) and baryon chemical potentials shown in panels (b), (d), and (f) for GCE using particle yields as input for fitting, respectively, for Au+Au collisions at √sNN = 7.7, 19.6, and 39 GeV. Results are compared for three initial conditions: μQ = 0, μQ constrained to B/2Q value, and μQ constrained to B/2Q along with μS constrained to 0. Uncertainties represent systematic errors."

约束条件选取：针对√sNN=7.7、19.6和39 GeV的金金（Au+Au）碰撞，以粒子产额（particle yields）作为拟合输入的巨正则系综（Grand Canonical Ensemble, GCE）模型中，提取得到的化学冻结温度（chemical freeze-out temperatures）分别展示于(a)、(c)、(e)面板，重子化学势（baryon chemical potentials）分别展示于(b)、(d)、(f)面板。针对三种初始条件对结果进行对比：电荷化学势μQ=0、电荷化学势μQ约束为B/2Q取值，以及电荷化学势μQ约束为B/2Q且奇异化学势μS约束为0。不确定性代表系统误差。