Neutral B Meson Mixing and Decay Constants from Lattice QCD

TL;DR

This paper reports updated lattice QCD calculations of neutral B-meson mixing parameters and decay constants, providing key inputs for understanding flavor physics and CP violation.

Contribution

The study offers new quenched approximation results for B-meson mixing and decay constants using improved lattice actions at two lattice spacings.

Findings

Calculated B-meson mixing parameters $B_{B_{d(s)}}$

Determined leptonic decay constants $f_{D_{(s)}}$, $f_{B_{(s)}}$

Evaluated $ riangle B=2$ matrix-elements and SU(3)-breaking ratios

Abstract

We present updates of our results for neutral $B$-meson mixing and leptonic decay constants obtained in the quenched approximation from a mean-field-improved Sheikholeslami-Wohlert action at two values of lattice spacing. We consider quantities such as $B_{B_{d(s)}}$, $f_{D_{(s)}}$, $f_{B_{(s)}}$ and the full $\Delta B=2$ matrix-elements, as well as the corresponding SU(3)-breaking ratios.