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- W4385934883 abstract "We update the full set of $bar{B}_srightarrow K$ form factors using light-cone sum rules with an on-shell kaon. Our approach determines the relevant sum rule parameters -- the duality thresholds -- from a Bayesian fit for the first time. Using a modified version of the Boyd-Grinstein-Lebed parametrisation, we combine our sum rule results at low momentum transfer $q^2$ with more precise lattice QCD results at large $q^2$. We obtain a consistent description of the form factors in the full $q^2$ range. Applying these results to a recent LHCb measurement of branching ratios for the decays $B_s^0 to lbrace K^-, D_s^-rbrace mu^+nu_mu$, we determine the ratio of Cabibbo-Kobayashi-Maskawa elements $$ notag left|frac{V_{ub}}{V_{cb}}right|_{q^2<7; textrm{GeV}^2} = 0.0681pm 0.0040 quad text{and} quad left|frac{V_{ub}}{V_{cb}}right|_{q^2>7 ;textrm{GeV}^2} = 0.0801pm 0.0047 , $$ which are mutually compatible at the $1.9sigma$ level. We further comment on the sensitivity to Beyond the Standard Model effects through measurements of the shape of $B_s^0 to K^- mu^+nu_mu$ decays, in light of recent limits on such effects from other exclusive $bto uellnu$ processes." @default.
- W4385934883 created "2023-08-18" @default.
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- W4385934883 date "2023-08-08" @default.
- W4385934883 modified "2023-09-23" @default.
- W4385934883 title "New determination of $|V_{ub}/V_{cb}|$ from $B_s^0to lbrace K^-, D_s^- rbrace mu^+nu$" @default.
- W4385934883 doi "https://doi.org/10.48550/arxiv.2308.04347" @default.
- W4385934883 hasPublicationYear "2023" @default.
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