Study on efficiency of event start time determination at BESIII

TL;DR

This paper introduces a Bayesian-based method to evaluate the efficiency of event start time determination at BESIII, accounting for various particle tracks and enabling systematic error estimation for specific physics channels.

Contribution

A novel Bayesian approach to estimate event start time efficiency at BESIII, incorporating track-level efficiencies and data-MC comparisons.

Findings

Efficiency results for different tracks are presented.

Differences between data and MC are analyzed.

Systematic errors for physics channels are estimable.

Abstract

A method to estimate efficiency of event start time determination at BESIII is developed. This method estimates the efficiency at the event level by combining the efficiencies of various tracks ($e$, $\mu$, $\pi$, K, $p$, $\gamma$) in a Bayesian way. Efficiencies results and difference between data and MC at the track level are presented in this paper. For a given physics channel, event start time efficiency and systematic error can be estimated following this method.