Heavy-light mesons in 2+1 flavor lattice QCD

TL;DR

This study uses 2+1 flavor lattice QCD with relativistic heavy quark action to compute heavy-light meson properties, achieving results close to experimental data and estimating CKM matrix elements.

Contribution

First application of relativistic heavy quark action on 2+1 flavor PACS-CS configurations for heavy-light mesons with physical quark masses.

Findings

Charm-light and charm-strange meson masses measured.

Decay constants consistent with experimental values.

Hyperfine splitting of charm-strange meson deviates from experiment.

Abstract

Heavy-light meson system is investigated using the relativistic heavy quark action on the 2+1 dynamical flavor PACS-CS configurations at the lattice spacing $a^{-1}=2.2$ GeV and the spatial extent L=3 fm. Dynamical up-down and strange quark masses as well as the valence charm quark mass are set around their physical values. We measure the charm-$ud$ and charm-strange meson masses and decay constants. Our results are consistent with the experimental values except the hyperfine splitting of the charm-strange meson. We also estimate the CKM matrix elements in the second row.