In December 2022, LHCb released a new test a lepton flavor universality through the simultaneous measurement of $R_{K}$ and $R_{K^{\ast}}$ in two intervals of the dilepton invariant mass: $q^2 \in [0.1,1.1] \, \text{GeV}^2$ (low-$q^2$) and $q^2 \in [1.1,6.0] \, \text{GeV}^2$ (central-$q^2$). This talk presents the analysis of a measurement of $R_{K^{\ast}}$ in a region of high values of $q^2$,...
Hadronic uncertainties are the main blockers for a full phenomenological use of experimental B decays analyses. I will show that global analyses of the b -> s transitions based on analyticity and unitarity give the proper framework to systematically reduce these uncertainties.
To improve the understanding of the differences observed in several different observables of mesonic $b\to s\ell^+\ell^-$ transitions, it is important to also study $b\to s\ell^+\ell^-$ transitions in baryon decays.
The decay $\Lambda_b^0\to\Lambda\ell^+\ell^-$ is particular interesting due to the fact that it is the most abundant produced weakly decaying b-baryon. Studying the angular...
