We extract the magnitude of the Cabibbo-Kobayashi-Maskawa matrix element V(c)} and the most relevant parameters of the heavy quark expansion from data of inclusive semileptonic B decays. Our calculation includes the recently computed O(α(s)Λ(QCD)(2)/m(b)(2)) corrections and a careful estimate of the residual theoretical uncertainty. Using a recent determination of the charm quark mass, we obtain |V(cb)|=(42.21±0.78)×10(-3) and m(b)(kin)(1  GeV)=(4.553±0.020)  GeV.

We study the effect of dimension 7 and 8 operators on inclusive semileptonic B decays and the extraction of |Vcb|. Using moments of semileptonic B decay spectra and information based on the Lowest-Lying State saturation Approximation (LLSA) we perform a global fit of the nonperturbative parameters of the heavy quark expansion including for the first time the O(1/mb^{4,5}) contributions. Higher power corrections appear to have a very small effect on the extraction of |Vcb|, independently of the weight we attribute to the LLSA.Comment: 6 pages, 3 figures, small changes to match accepted publication in PL

We study constraints on the models of bosonic super-weakly interacting particle (super-WIMP) dark matter (DM) with DM masses $m_X \sim \mathcal{O}(1 - 100)$ keV from leptonic decays $M\rightarrow \ell \bar{\nu}_\ell + X$, where $M=B^\pm, D^\pm, D_s^\pm$ is a heavy meson state. We focus on two cases where $X$ denotes either a light pseudoscalar (axion-like), or a light vector state that couples to the standard model (SM) through kinetic mixing. We note that for a small DM mass these decays are separately sensitive to DM couplings to quarks, but not its mass.Comment: 17 pages, 3 figures, 6 table

Recent evidence from observation of the flavor-changing neutral current decay B 0 s → µ + µ − by the LHCb collaboration B(B 0 s → µ + µ −) = (3.2 +1.5 −1.2) × 10 −9 is consistent with the latest standard model prediction B SM (B 0 s → µ + µ −) = (3.23 ± 0.27) × 10 −9. While new physics can still affect this decay amplitude, its contribution is certainly not the dominant one. We analyze branching ratios

We use artificial neural networks to parameterize the shape functions in inclusive semileptonic B decays without charm. Our approach avoids the adoption of functional form models and allows for a straightforward implementation of all experimental and theoretical constraints on the shape functions. The results are used to extract |V ub | in the GGOU framework and compared with the original GGOU paper and the latest HFAG results, finding good agreement in both cases. The possible impact of future Belle-II data on the MX distribution is also discussed.