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

Inclusive semi-leptonic B(s) mesons decay at the physical b quark mass

12 Aug 2022, 14:50

20m

CP1-HSZ/1.002 (CP1-HSZ) - HS6 (CP1-HSZ)

Oral Presentation Weak Decays and Matrix Elements 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 $B_s\to X_{c}l\overline{\nu }$ 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.

Presentation materials

Barone_lat22.pdf