Abstract
NA61/SHINE is a large acceptance fixed target experiment at the CERN SPS which studies final hadronic states in interactions between various particles and nuclei [1]. The main topic of this contribution are preliminary results for mean negatively charged pion multiplicities 〈π−〉 from central Ar+Sc and Be+Be collisions. The data were taken recently by the NA61/SHINE collaboration for a wide range of beam momenta. Measured rapidity distributions [see formula in PDF] were extrapolated to unmeasured regions to obtain total multiplicities 〈π−〉 A new scheme to calculate the mean number of wounded nucleons 〈W〉 utilizing the EPOS MC model is described. Using data from other experiments, a comparison of [see formula in PDF]for different collisions and beam momenta is discussed.
Highlights
The main topic of this contribution are preliminary results for mean negatively charged pion multiplicities π− from central Ar+Sc and Be+Be collisions
In order to correct for trigger and reconstruction inefficiencies, one needs to apply a Monte Carlo correction
The EPOS MC [3] is used in NA61/SHINE
Summary
The main topic of this contribution are preliminary results for mean negatively charged pion multiplicities π− from central Ar+Sc and Be+Be collisions. A large statistics of ion collisions is generated and particles are accumulated in bins nig,ejn in transverse momentum pT versus rapidity y. Selecting negatively charged pions results in the distribution nis,ejl. Final experimental spectra are obtained as multiplicity in the full acceptance, one ni, j = needs nid,ajtaci, j.
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