"Figure 4 top right" of "Forward neutral pion production in p+p and d+Au collisions at s(NN)**(1/2) = 200-GeV."

Coincidence probability versus azimuthal angle difference between the forward $\pi^{0}$ and a leading charged particle at midrapidity with $p_{T}$ > 0.5 GeV/c. The left (right) column is p+p (d+Au) data. The curves are fits described in the text, including the area of the back-to-back peak (S).

该数据集呈现了中间快度区内、横向动量（p_T）大于0.5 GeV/c的前向中性π介子与领头带电粒子之间的符合概率随方位角差的变化关系。左（右）列分别为质子-质子（p+p）与氘核-金核（d+Au）碰撞的实验数据。图中曲线为正文中所述的拟合结果，其中包含背对背峰的面积（S）。