"Figure 2.7" 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"

Balance function $B^{\pi{\rm p}}$ projected onto the $\Delta y$ axis for particle pairs within the full range $|\Delta\varphi|\leq \pi$ in Pb--Pb collisions at $\sqrt{s_{\rm NN}}=2.76\;\text{TeV}$ for selected centrality ranges ($\pi,{\rm K}: 0.2 \leq p_{\rm T} \leq 2.0\;{\rm GeV}/c$; ${\rm p}: 0.5 \leq p_{\rm T} \leq 2.5\;{\rm GeV}/c$).

在核子-核子质心系能量$sqrt{s_{
m NN}}=2.76; ext{TeV}$的铅-铅（Pb-Pb）碰撞中，针对方位角差满足$|Deltavarphi|leqpi$的全范围粒子对，结合所选中心度区间（π介子与K介子的横向动量范围为$0.2 leq p_{
m T} leq 2.0; ext{GeV}/c$；质子的横向动量范围为$0.5 leq p_{
m T} leq 2.5; ext{GeV}/c$），将对应的平衡函数（Balance function）$B^{pi{
m p}}$投影至快度差$Delta y$轴上。