Results for the mass difference between the long- and short- lived K mesons for physical quark masses

2018/12/13 by Bigeng Wang, Wang, Bigeng
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Lattice (hep-lat) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions

paper · pdf · doi:10.48550/arxiv.1812.05302

openalex publication_date 2018/12/13 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

The two neutral kaon states in nature, the K_L (long-lived) and K_S (short-lived) mesons, are the two time-evolution eigenstates of the K⁰ - K⁰ mixing system. The prediction of their mass difference Δm_K based on the Standard Model is an important goal of lattice QCD. In this article, I will present preliminary results from a calculation of Δm_K performed on an ensemble of 64³ × 128 gauge configurations with inverse lattice spacing of 2.36 GeV and physical quark masses. These new results come from 2.5 times the Monte Carlo statistics used for the result presented in last year's conference. Further discussion of the methods employed and the resulting systematic errors will be given.

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