Simulation of the BESIII Endcap Time of Flight Upgrade

TL;DR

This paper presents a detailed simulation study of an upgraded endcap Time-of-Flight detector for BESIII, demonstrating that a time resolution of about 80 ps enables effective pion and kaon separation up to 1.4 GeV/c.

Contribution

The study introduces a comprehensive Geant4-based simulation and reconstruction framework for the BESIII TOF upgrade, validated against beam test data.

Findings

Achieves a time resolution of approximately 80 ps.

Enables pion/kaon separation up to 1.4 GeV/c at 95% confidence.

Demonstrates the effectiveness of multigap resistive plate chambers for the upgrade.

Abstract

The results of a full simulation of an endcap Time-of-Flight detector upgrade based on multigap resistive plate chambers for the BESIII experiment are presented. The simulation and reconstruction software is based on Geant4 and has been implemented into the BESIII Offline Software System. The results of the simulations are compared with beam test results and it is shown that a total time resolution $\sigma$ of about 80 ps can be achieved allowing for a pion and kaon separation up to momenta of 1.4 GeV/c at a 95% confidence level.