Measurement of CP violation of neutral kaon system in J/ψ decay at the Super Tau-Charm Facility

2022/09/26 by Jianyu Zhang, Zhang, Jian-Yu, C. D. Fu +7 · 1 citation
Computer Science · Physics and Astronomy · #Computational Physics and Python Applications #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph) #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions

paper · pdf · doi:10.48550/arxiv.2209.12551

openalex publication_date 2022/09/26 · openalex created_date 2022/09/28 · openalex updated_date 2026/07/28

Abstract

In this paper, we present a preliminary study of CP violation effect of K⁰-K⁰ system in J/ψ decay. The CP violation parameters η_+- and η₀₀ as well as their corresponding phase ϕ_+- and ϕ₀₀ can be determined by the difference of the time-dependent decay rates between K⁰ and K⁰ produced from J/ψ→ K^-π⁺K⁰ + c.c. processes. We investigate the precisions of the measurements of the CP violation effect at the Super Tau-Charm facility(STCF), a e⁺e^- collider with a peak luminosity of 0.5×10³⁵ \rmcm^-2\rms^-1. The parameters η_+- and its phase ϕ_+- can be measured at a relative precision of 1 × 10^-3, which the statistical accuracy will be several times better than that of the existing PDG average values.

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