"Figure 4.1" of "General balance functions of identified charged hadron pairs of $(\pi,{\rm K},{\rm p})$ in Pb$-$Pb collisions at $\sqrt{s_{\rm NN}} = 2.76$ TeV"

Longitudinal ($\Delta y$) $\sigma$ widths of balance functions of the full species matrix of $\pi^{\pm}$, ${\rm K}^{\pm}$, and ${\rm p/\bar{p}}$ with centrality. Pairs ${\rm K}\pi$, ${\rm p}\pi$, and ${\rm pK}$ have the same values with $\pi{\rm K}$, $\pi{\rm p}$, and ${\rm Kp}$, respectively. The relative azimuthal angle range for all the species pairs is the full azimuth range $|\Delta\varphi|\leq\pi$ ($\pi,{\rm K}: 0.2 \leq p_{\rm T} \leq 2.0\;{\rm GeV}/c$; ${\rm p}: 0.5 \leq p_{\rm T} \leq 2.5\;{\rm GeV}/c$).

π±介子、K±介子以及质子/反质子（$
m p/ar{p}$）全粒子种类矩阵的平衡函数（balance functions）的纵向（快度差$oldsymbol{Delta y}$）$oldsymbol{sigma}$宽度随碰撞中心度的变化。其中，Kπ、pπ与pK粒子对分别与πK、πp和Kp粒子对具有完全一致的数值。所有粒子种类对的相对方位角范围为全方位角区间$|oldsymbol{Deltavarphi}| leq pi$，其中π与K介子的横向动量（$p_T$）取值范围为0.2 ≤ $p_T$ ≤ 2.0 GeV/c，质子的横向动量取值范围为0.5 ≤ $p_T$ ≤ 2.5 GeV/c。