Study of the tracking efficiency of charged pions at BESIII

TL;DR

This paper evaluates the tracking efficiency of charged pions at BESIII using a large dataset of J/psi decays, providing systematic uncertainties and correction factors across various kinematic bins.

Contribution

It presents a detailed measurement of charged pion tracking efficiency and systematic uncertainties using extensive BESIII data, improving detector performance understanding.

Findings

Tracking efficiency quantified across momentum and angle bins.

Systematic uncertainties and correction factors established.

Enhanced accuracy in pion detection at BESIII.

Abstract

Using $(10087 \pm 44) \times 10^6$ $J/\psi$ events collected with the BESIII detector in 2009, 2012, 2018 and 2019, the tracking efficiency of charged pions is studied using the decay $J/\psi \rightarrow \pi^+ \pi^- \pi^0$. The systematic uncertainty of the tracking efficiency and the corresponding correction factors for charged pions are evaluated, in bins of transverse momentum and polar angle of the charged pions.