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# 36th Annual International Symposium on Lattice Field Theory

22-28 July 2018
Kellogg Hotel and Conference Center
EST timezone

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

Jul 27, 2018, 3:40 PM
20m
103 (Kellogg Hotel and Conference Center)

### 103

#### Kellogg Hotel and Conference Center

219 S Harrison Rd, East Lansing, MI 48824
Weak Decays and Matrix Elements

### Speaker

Mr Bigeng Wang (Columbia University)

### Description

The two neutral kaon states in nature, the KL (long-lived) and KS (short-lived) mesons, are the two time-evolution eigenstates of the $K^0$ -- $\overline{K}^0$ mixing system. The prediction of their mass difference $\Delta M_K$ based on the Standard Model is an important goal of lattice QCD. In this talk, I will present preliminary results from a calculation of $\Delta M_K$ performed on an ensemble of $64^3\times128$ gauge configurations with inverse lattice spacing of 2.36 GeV and physical quark masses. These new results come from twice 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.

### Primary author

Mr Bigeng Wang (Columbia University)

 Slides