A measurement of the denominators of R(D$^{(*)}$) with 189 fb $^{-1}$ inverse femtobarns of Belle II data

Using a sub-sample of the Belle II data sample of luminosity 189 inverse femtobarns, the branching fraction of a B meson decaying to a D(*) meson, lepton and corresponding neutrino, where the lepton is either a muon or electron, is explored. This analysis first contributed to the published Belle II results of the hadronic tagged B0 meson branching fraction decaying to a D*+ meson, muon or electron, and corresponding neutrino where the D*+ decays to a D0 meson and charged pion, and where the D0 meson decays to a charged kaon and pion. This study is expanded to use both B+ meson and B0 meson decays in addition to multiple exclusive D* meson and D meson decay modes. This contributes to one of the first tests of lepton flavour universality at Belle II using exclusive measurements of the denominator of R(D(*)) = the branching fraction of a B meson decaying to a D(*) meson, tau lepton and corresponding neutrino divided by the branching fraction of a B meson decaying to a D(*) meson, muon or electron, and corresponding neutrino

electron positron: annihilation
electron positron: colliding beams
B: branching ratio
D*(2010): hadronic decay
D0: hadronic decay
lepton: flavor: universality
B0: branching ratio
branching ratio: ratio: measured
D: decay modes
BELLE

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A measurement of the denominators of R(D(∗)^{(*)}(∗)) with 189 fb −1^{-1}−1 inverse femtobarns of Belle II data

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A measurement of the denominators of R(D $^{(*)}$ ) with 189 fb $^{-1}$ inverse femtobarns of Belle II data