Kavli Affiliate: T. Higuchi
| First 5 Authors: Belle II Collaboration, F. Abudinén, I. Adachi, K. Adamczyk, P. Ahlburg
| Summary:
A search for the flavor-changing neutral-current decay $B^{+}to
K^{+}nubar{nu}$ is performed at the Belle II experiment at the SuperKEKB
asymmetric energy electron-positron collider. The results are based on a data
sample corresponding to an integrated luminosity of $63,mbox{fb}^{-1}$
collected at the $Upsilon{(4S)}$ resonance and a sample of $9,mbox{fb}^{-1}$
collected at an energy $60mathrm{,Mekern -0.1em V}$ below the resonance. A
novel measurement method is employed, which exploits topological properties of
the $B^{+}to K^{+}nubar{nu}$ decay that differ from both generic
bottom-meson decays and light-quark pair production. This inclusive tagging
approach offers a higher signal efficiency compared to previous searches. No
significant signal is observed. An upper limit on the branching fraction of
$B^{+}to K^{+}nubar{nu}$ of $4.1 times 10^{-5}$ is set at the 90%
confidence level.
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