Abstract

Charm particle production in nucleus-nucleus collisions at the CERN SPS energies is considered within a statistical approach. Namely, the Statistical Model of the Early Stage is used to calculate mean multiplicity of charm particles in central Pb+Pb collisions. A small number of produced charm particles necessitates the use of the exact charm conservation law. The model predicts a rapid increase of mean charm multiplicity as a function of collision energy. The mean multiplicity calculated for central Pb+Pb collisions at the center of mass energy per nucleon pair $\sqrt{s_{NN}}=17.3$ GeV exceeds significantly the experimental upper limit. Thus, in order to describe open charm production model parameters and/or assumptions should be revised.

Highlights

  • Charm particle production in nucleus–nucleus collisions at the CERN SPS energies is considered within a statistical approach

  • The Statistical Model of the Early Stage is used to calculate the mean multiplicity of charm particles in central Pb+Pb collisions

  • Model predictions concerning mean multiplicity of ccpairs produced in central lead–lead collisions at the top CERN SPS energy, Elab = 158A GeV, differ significantly

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Summary

Introduction

Charm particle production in nucleus–nucleus collisions at the CERN SPS energies is considered within a statistical approach. The Statistical Model of the Early Stage is used to calculate the mean multiplicity of charm particles in central Pb+Pb collisions. The model predicts a rapid increase of mean charm multiplicity as a function of collision energy.

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