"Figure 1" of "Photoproduction of K$^{+}$K$^{-}$ pairs in ultra-peripheral collisions"

d$^2\sigma$/d$y$/d$p_T^2$ in bins of $p_{T,KK}^2$ for $K^+K^-$ photoproduction in ultra-peripheral Pb$-$Pb collisions at $\sqrt{s_\mathrm{NN}}$ = 5.02 TeV .

本数据集针对√s_NN=5.02 TeV的超外围铅-铅碰撞中K⁺K⁻对的光生过程，给出按K⁺K⁻对的横向动量平方p_{T,KK}²分箱的二阶微分截面d²σ/(dy dp_T²)。