We present a determination of Vcb taking into account the most recent data on exclusive decays as well as form factor calculations from lattice QCD. We employ unitarity constraints within the Boyd-Grinstein-Lebed (BGL) parametrization and carefully study their impact on the results. Furthermore, we give updated Standard Model predictions for the lepton-flavor non-universality observables R(D(*)).
We perform a fit of the Isgur-Wise function including ${\cal O}(1/m_c^2)$ corrections to the available theoretical and experimental constraints. We include the tensor form factors and the corresponding unitarity bounds for the first time in this framework. We discuss the compatibility between the different constraints. We also compare our results with those of other methods. We present our SM...
We propose a simultaneous analysis of $B \to D \ell \nu$ and $B\to D^{*} \ell \nu$ decays to measure model-independent observables for the determination of $|V_{cb}|$. The $B\to D^{*} \ell \nu$ decays is partially reconstructed, removing systematic uncertainty on $|V_{cb}|$ from the soft-pion reconstruction. By assuming equality of the semileptonic decay width of $B^0$ and $B^+$ mesons, we...
Semileptonic $B$ decays involving multiple final-state hadrons play a crucial role as backgrounds to studies of lepton flavour universality or recent anomaly observed in $B \rightarrow K\nu\nu$. Furthermore, these poorly understood decays constitute sizeable signal components in measurements of inclusive $B \rightarrow X_{u/c} \ell\nu$ decays and the subsequent extraction of inclusive...
In this talk, we present studies of two semileptonic decays with two hadrons in the final state. First, we’ll discuss $B \rightarrow D \pi \ell \nu$ decays that not only constitute a sizeable background for $R(D^{(*)})$ determinations, but also comprise a largely unknown signal component for inclusive $B \rightarrow X_{c}\ell \nu$ decays. The dominant decay chain proceeds through resonant $B...
The $R(D^{(*)})$ ratio is an excellent test of Lepton Flavor Universality, that promises to elucidate the nature of potential Beyond the Standard Model physical processes. In this talk, we present the latest $R(D^{(*)})$ measurements from the Belle II experiment. Additionally, we explore a likelihood based combination of different analyses relying on orthogonal selections, that goes beyond...
Differential measurements of semileptonic b-hadron decays not only further our understanding of hadronic effects and CKM matrix elements, but are also powerful probes for effects beyond the Standard Model description. An overview of the angular measurements currently pursued at LHCb is presented, including expected New Physics sensitivities and prospects for future measurements.
Semileptonic b-baryons decays provide powerful probes for testing the Standard Model and for searching for New Physics effects. In this contribution, the LHCb semileptonic measurements with b-baryons will be presented: the status, the analyses ongoing and the prospect for future.
