\pai (left) and \e (right) nuclear modification factors \RpPb measured in NSD \pPb collisions at -1.365 $< y_{\mathrm{cms}}< $ 0.435 at \spPb compared to the nuclear modification factors of charged pions and charged kaons, respectively. The statistical uncertainties are shown as vertical error bars and the systematic uncertainties are represented as boxes. The overall normalization uncertainty is given as the solid black box around unity.