Search for B+→K+νν¯ Decays Using an Inclusive Tagging Method at Belle II

Abudinen, F.; et al.,

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Search for B+→K+νν¯ Decays Using an Inclusive Tagging Method at Belle II

MPS-Authors

Abudinen, F.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

et al.,
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

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https://publications.mppmu.mpg.de/2021/MPP-2021-236/FullText.12624.pdf
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https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.127.181802
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Citation

Abudinen, F., & et al. (2021). Search for B+→K+νν¯ Decays Using an Inclusive Tagging Method at Belle II. Physical Review Letters, 127, 181802. Retrieved from https://publications.mppmu.mpg.de/?action=search&mpi=MPP-2021-236.

Cite as: https://hdl.handle.net/21.11116/0000-000A-1A50-F

Abstract

A search for the flavor-changing neutral-current decay B + → K+νν¯ is performed at the Belle II experiment at the SuperKEKB asymmetric energy electron-positron collider. The data sample corresponds to an integrated luminosity of 63 fb−1 collected at the Υ(4S) resonance and a sample of 9 fb−1 collected at an energy 60 MeV below the resonance. Because the measurable decay signature involves only a single charged kaon, a novel measurement approach is used that exploits not only the properties of the B + → K+νν¯ decay, but also the inclusive properties of the other B meson in the Υ(4S) → BB¯ event, to suppress the background from other B 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 + → K+νν¯ of 4.1 × 10−5 is set at the 90% confidence level.