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Jul 26 – 30, 2021
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Updated Predictions for $R(D^{(*)})$ within and beyond the Standard Model and determination of $|V_{cb}|$

Jul 27, 2021, 10:30 AM


Parallel session talk Flavour Physics and CP Violation T08: Flavour Physics and CP Violation


Florian Bernlochner (BELLE (BELLE II Experiment))


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

Primary authors

Zoltan Ligeti (LBNL) Dean Robinson (LBNL) Michele Papucci (Caltech) Markus Prim (University of Bonn) Xiong Chenglu (University of Bonn) Florian Bernlochner Florian Bernlochner (BELLE (BELLE II Experiment))

Presentation materials