# The 34th International Symposium on Lattice Field Theory (Lattice 2016)

24-30 July 2016
Highfield Campus, University of Southampton
Europe/London timezone

## Decay constants $f_B$ and $f_{B_s}$ and quark masses $m_b$ and $m_c$ from HISQ simulations

29 Jul 2016, 16:30
20m
Building 67 Room 1003 (Highfield Campus, University of Southampton)

### Building 67 Room 1003

#### Highfield Campus, University of Southampton

Highfield Campus, Southampton SO17 1BJ, UK
Talk Weak Decays and Matrix Elements

### Speakers

Claude Bernard (Washington University) Javad Komijani (Technische Universit\"at M\"unchen)

### Description

We present high-precision results for the decay constants $f_B$ and $f_{B_s}$ from simulations with HISQ heavy and light valence and sea quarks. Calculations are carried out with several heavy valence-quark masses on ensembles with 2+1+1 flavors of HISQ sea quarks. We generate data at five lattice spacings with three light sea quark mass ratios, including an approximately physical ensemble at every lattice spacing. This range of parameters provides excellent control of the continuum limit and of heavy-quark discretization errors. In addition to the decay constants, we present results for charm- and bottom-quark masses extracted from heavy-light meson masses using an approach based on HQET.