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

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

## Inclusive semi-leptonic $B_{(s)}$ mesons decay at the physical $b$ quark mass

Aug 12, 2022, 2:50 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

Alessandro Barone (University of Southampton)

### Description

We address the non-perturbative calculation of the decay rate of the inclusive semi-leptonic $B_{(s)}$ mesons decay from lattice QCD. Precise theoretical Standard Model predictions are key ingredients in searches for new physics. This type of computation may eventually provide new insight into the long-standing tension between the inclusive and exclusive determination of the $V_{cb}$ and $V_{ub}$ CKM matrix elements.
We perform a pilot lattice computation for $B_s \rightarrow X_c \, l \bar{\nu}$ and improve on existing techniques. The valence-quark masses in our simulations are approximately physical for the domain-wall strange and charm quarks as well as for the $b$ quark, for which we use a relativistic heavy quark effective action. We report on our progress and discuss future plans toward a first study with fully controlled systematic effects.

### Primary authors

Alessandro Barone (University of Southampton) Andreas Juttner (CERN and University of Southampton) Ryan Kellermann (KEK) Shoji Hashimoto (KEK) Takashi Kaneko (KEK)