Speaker
Description
Precision determinations of $V_{ub}$ and $V_{cb}$ play a central role in precision tests of the CKM sector of the Standard Model and complement direct measurements of CP violation of B meson decays. In this talk, we present first studies towards measurements of $|V_{ub}|$ and $V_{cb}$, with semileptonic decays using collision events recorded at the $\Upsilon(4S)$ resonance by the Belle II experiment. We report the status of measuring branching fractions and kinematic properties of inclusive and exclusive $b \to u \ell \bar \nu_\ell$ and $b \to c \ell \bar \nu_\ell$ decays using untagged and tagged approaches in the full available Belle II data set. In addition, we present a Belle II measurement of the $q^2$ moments of $B \rightarrow X_{c} \ell \nu$ decay. The $q^2$ moments of the $b \rightarrow c \ell \nu$ transition are particularly powerful for constraining the Heavy Quark Expansion as they can be expressed in terms of a reduced set of matrix elements due to reparametrization invariance.
First author | Jim Libby |
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libby@iitm.ac.in | |
Collaboration / Activity | Belle II |