Article,
Jet charge identification in the e+e- → Z → q(q)over-bar process at Z pole
Affiliations
- [1] Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China [NORA names: China; Asia, East];
- [2] Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China [NORA names: China; Asia, East];
- [3] Univ Chinese Acad Sci UCAS, Beijing 100049, Peoples R China [NORA names: China; Asia, East];
- [4] China Inst Atom Energy, Sci & Technol Nucl Data Lab, Beijing, Peoples R China [NORA names: China; Asia, East];
- [5] Univ Copenhagen, Neils Bohr Inst, Copenhargen, Denmark [NORA names: KU University of Copenhagen; University; Denmark; Europe, EU; Nordic; OECD];
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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 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.