Kavli Affiliate: T. Higuchi
| First 5 Authors: Belle II Collaboration, I. Adachi, K. Adamczyk, L. Aggarwal, H. Aihara
| Summary:
Additional spin-0 particles appear in many extensions of the standard model.
We search for long-lived spin-0 particles $S$ in $B$-meson decays mediated by a
$bto s$ quark transition in $e^+e^-$ collisions at the $Upsilon(4S)$
resonance at the Belle II experiment. Based on a sample corresponding to an
integrated luminosity of $189 mathrm{,fb}^{-1}$, we observe no evidence for
signal. We set model-independent upper limits on the product of branching
fractions $mathrm{Br}(B^0to K^*(892)^0(to K^+pi^-)S)times mathrm{Br}(Sto
x^+x^-)$ and $mathrm{Br}(B^+to K^+S)times mathrm{Br}(Sto x^+x^-)$, where
$x^+x^-$ indicates $e^+e^-, mu^+mu^-, pi^+pi^-$, or $K^+K^-$, as functions
of $S$ mass and lifetime at the level of $10^{-7}$.
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