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- W4288055899 abstract "We report a study of $B to J/psi(ell^{+}ell^{-})K$ decays, where $ell$ represents an electron or a muon, using $e^{+}e^{-}$ collisions at the $Upsilon(4S)$ resonance. The data were collected by the Belle II experiment at the SuperKEKB asymmetric-energy collider during 2019-2021, corresponding to an integrated luminosity of $189$ fb$^{-1}$. The measured quantities are the branching fractions (${mathcal B}$) of the decay channels $B^{+} to J/psi(e^{+}e^{-})K^{+}$, $B^{+} to J/psi(mu^{+}mu^{-}) K^{+}$, $B^{0} to J/psi(e^{+}e^{-}) K^{0}_{S}$, and $B^{0} to J/psi(mu^{+}mu^{-})K^{0}_{S}$; the lepton-flavor-dependent isospin asymmetries for the electron [$A_{I}left(B to J/psi(e^{+}e^{-}) Kright)$] and muon [$A_{I}left(B to J/psi(mu^{+} mu^{-}) Kright)$] channels; and the ratios of branching fractions between the muon and electron channels for the charged [$R_{K^{+}}left(J/psiright)$] and neutral kaon [$R_{K^{0}}left(J/psiright)$] case. The measurements are consistent with the world-average values." @default.
- W4288055899 created "2022-07-28" @default.
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