Jet charge identification in ee-Z-qq process at Z pole operation

TL;DR

This paper introduces a new jet charge identification method using leading charged particles, achieving improved tagging power for heavy flavor jets at the Z pole, crucial for electroweak and flavor physics measurements.

Contribution

The paper presents the Leading Particle Jet Charge method and its combination with Weighted Jet Charge to enhance heavy flavor jet tagging performance.

Findings

Effective tagging power of 39% for c jets and 20% for b jets with HFJC.

Performance depends on jet fragmentation and detector capabilities.

Method tested at 91.2 GeV center-of-mass energy.

Abstract

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 about the leading charged particle. Tested on Z - bb and Z - cc samples at a center-of-mass energy of 91.2GeV, the LPJC achieves an effective tagging power of 20%/9% for the c/b jet, respectively. Combined with the Weighted Jet Charge method (WJC), we develop a Heavy Flavor Jet Charge method (HFJC), which achieves an effective tagging power 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, and critical detector performances.