Speaker
Description
A first-principles computation of the inclusive semileptonic decay
rates of heavy mesons from Lattice QCD has a great phenomenological
relevance since the comparisons of the theoretical results with the
corresponding experimental data allows for stringent Standard Model
tests in the sector of Flavour physics. In this talk we present the
first fully non-perturbative computation of the $D_s \to X \ell \nu$
decay rate and of the associated leptonic moments, carried out on
state-of-the-art ETMC ensembles at the physical point with four lattice
spacings and three volumes. The extraction of the relevant smeared
spectral densities from Euclidean four-point correlation functions has
been performed with controlled statistical and systematic uncertainties
by using the Hansen-Lupo-Tantalo method. Additionally, we present
preliminary results of our ongoing calculation of the inclusive
semileptonic $B$ meson decay rates.