Mean pion multiplicities in Ar+Sc collisions

Abstract

Preliminary results for mean negatively charged pion multiplicities $⟨{\pi }^{-}⟩$ using the $h^{-}$ method are presented for central Ar+Sc collisions at 13, 19, 30, 40, 75 and 150\textit{A} GeV/c beam momentum. The data were recorded by the NA61/SHINE detector at the CERN SPS. Starting with rapidity distributions $dn/dy$ the procedure of obtaining total multiplicities is presented. The mean number of wounded nucleons $⟨W⟩$ extracted from the Glissando MC model is used to calculate the ratio $⟨{\pi }^{-}⟩/⟨W⟩.$ The results are compared to those from other experiments and their dependence on colliding systems and collision energy is discussed.

Presented at Critical Point and Onset of Deconfinement 2016 (CPOD2016), Wrocław, Poland