Jet charge identification in the e+e- → Z → q(q)over-bar process at Z pole

Accurate jet charge identification is essential for precise electroweak and flavor measurements at the high-energy frontier. We propose a novel method called the Leading Particle Jet Charge method (LPJC) to determine the jet charge based on information of the leading charged particle. Tested on Z -> b (b) over bar and Z -> c (c) over bar samples at center-of-mass energy of 91.2 GeV, the LPJC achieves an effective tagging power epsilon(eff) of 20%/9% for c/b jet, respectively. In combination with the Weighted Jet Charge method (WJC), we develop a Heavy Flavor Jet Charge method (HFJC), which achieves an effective tagging power epsilon(eff) of 39%/20% for c/b jet, respectively. This paper also discusses the dependencies between jet charge identification performance and the fragmentation process of heavy flavor jets, as well as critical detector performances.