# The 39th International Symposium on Lattice Field Theory (Lattice 2022)

Aug 8 – 13, 2022
Hörsaalzentrum Poppelsdorf
Europe/Berlin timezone

## B Meson Decay Constants Using Relativistic Heavy Quarks

Aug 12, 2022, 2:10 PM
20m
CP1-HSZ/1st-1.002 - HS6 (CP1-HSZ)

### CP1-HSZ/1st-1.002 - HS6

#### CP1-HSZ

50
Oral Presentation Weak Decays and Matrix Elements

### Speaker

Matthew Black (University Siegen)

### Description

We present the status of ongoing work to extract pseudoscalar and vector decay constants for $B^{(*)}$, $B_s^{(*)}$ and $B_c^{(*)}$ mesons and determine phenomenologically interesting ratios such as f_Bs/f_B or f_B*/f_B.
Our calculation is based on $N_f=2+1$ dynamical flavour gauge field ensembles generated by the RBC/UKQCD collaborations using domain wall fermions and the Iwasaki gauge action.
Using domain wall light, strange and charm quarks, and relativistic $b$-quarks, we obtain results at multiple lattice spacings and valence quark masses.
We then extrapolate to physical quark masses and the continuum and compare to predictions by other lattice collaborations and QCD sum rules. Furthermore, we use our results to test heavy quark symmetry relations.

### Primary author

Matthew Black (University Siegen)