Improvement of main drift chamber Monte-Carlo tuning model at BESIII

Abstract

Based on real data, a new parameterized model of the main drift chamber response is proposed. In this model, we tune the ratio of good hits and the residual distribution separately. By data quality checking, the difference between simulation and data in track reconstruction efficiency reduces from 1% to 0.5% averagely for the pion in J/ψ → π+π−π0, and the momentum resolution agreement improves significantly for the proton in J/ψ → pp̄.