Kavli Affiliate: T. Higuchi
| First 5 Authors: Belle II Collaboration, F. Abudinén, I. Adachi, R. Adak, K. Adamczyk
| Summary:
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.
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