Decay Constants of Heavy-Light Mesons

TL;DR

This paper presents high-statistics lattice QCD calculations of decay constants for heavy-light mesons, analyzing discretization errors and providing estimates for $f_D$, $f_{Ds}$, and preliminary $f_B$ values.

Contribution

It offers new lattice QCD results for heavy-light meson decay constants using Wilson and clover actions at specific lattice spacings, including systematics of discretization errors.

Findings

Estimated $f_D$ = 218(9) MeV

Decay constant ratio $f_D/f_{Ds}$ = 1.11(1)

Preliminary $f_B$ values obtained

Abstract

The decay constants of the heavy-light pseudoscalar mesons are studied in a high statistics run using the Wilson action at $\beta=6.0$ and $\beta=6.2$, and the clover action at $\beta=6.0$. The systematics of $O(a)$ discretisation errors are discussed. Our best estimates of the decay constants are: $f_D$ = 218(9) MeV, $f_D/f_{Ds}$ = 1.11(1) and we obtain preliminary values for $f_B$.