Distribution of $\Delta t_{i}$ assuming the pion mass hypothesis in the transverse momentum interval 1.9 $< $ $p_{\rm{T}}$ $< $ 2.0 GeV/$c$. The data (black points) are fitted with a function (light blue line) that is the sum of the signal due to pions (green dotted line) and the two populations corresponding to kaons (red dotted line) and protons (purple dashed line). |