• Corpus ID: 102351215

# Test of lepton flavor universality in ${B\to K^\ast\ell^+\ell^-}$ decays at Belle

@article{Abdesselam2019TestOL,
title={Test of lepton flavor universality in \$\{B\to K^\ast\ell^+\ell^-\}\$ decays at Belle},
journal={arXiv: High Energy Physics - Experiment},
year={2019}
}
• Published 4 April 2019
• Physics
• arXiv: High Energy Physics - Experiment
We present a measurement of $R_{K^{\ast}}$, the ratio of the branching fractions ${\cal B}(B\to K^\ast \mu^+ \mu^-)$ and ${\cal B}(B\to K^\ast e^+ e^-)$, for both charged and neutral $B$ mesons. The ratio for charged $B$ mesons, $R_{K{^{\ast +}}}$, is the first measurement ever performed. The analysis is based on a data sample of $711~\mathrm{fb}^{-1}$, containing $772\times 10^{6}$ $B\bar B$ events, recorded at the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy…
37 Citations

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