Speaker
Description
In Heavy Quark Effective Theory (HQET), measured $B \to D^{(*)} \ell \bar \nu_\ell$ decay rates for light leptons constrain all $B \to D^{(*)}$ semileptonic form factors, both in and beyond the Standard Model (SM). We update our prior HQET-based analysis, carrying out a global fit including newly available measurements of $B \to D^{(*)} \ell \bar \nu_\ell$ decay distributions to predict: the $B \to D^{(*)} \tau \bar \nu_\tau$ rates; the lepton universality ratios $R(D^{(*)})$ within and beyond the SM; and determine the CKM matrix element $|V_{cb}|$. The update incorporates a more systematic treatment of certain corrections at order $1 / m_{c}^2$, and discusses the impact of including preliminary lattice QCD information for $B \to D^{(*)}$ form factor ratios from JLQCD.
Collaboration / Activity | University of Bonn |
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