The 38th International Symposium on Lattice Field Theory

Precision B∗Bπ coupling from three flavor lattice QCD

29 Jul 2021, 13:00

15m

Oral presentation Standard Model Parameters Standard Model Parameters

Speaker

Mr Simon Kuberski (Helmholtz-Institut Mainz)

Description

We consider three-flavor QCD and perform a determination of the low energy coupling $\hat{g}$ of SU(2) Heavy Meson Chiral Perturbation Theory. It is the $B^{\ast }B\pi$ coupling in the limit of static heavy and chiral light quarks in $N_{\mathrm{f}}=2+1$ flavor QCD and has not been determined with precision thus far. The calculation is performed on the $2+1$ flavor CLS ensembles using the summed GEVP method.
The extrapolation to the limit of chiral light quarks is based on a number of gauge ensembles with pion masses in the range from $420$MeV down to $130$MeV. This allows us to significantly reduce the systematic uncertainty from the extrapolation compared to previous works. Only a weak dependence on the lattice spacing is visible in our results.
This work is a first step in the $2+1$ flavor HQET program of the ALPHA collaboration.

Presentation materials

231_R3Sm_Simon_Kuberski

lattice21_kuberski.pdf