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Setting Limits on Supersymmetry Using Simplified Models
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First Search for B→X_{s}νν[over ¯] Decays.

M Abumusabh, I Adachi, K Adamczyk

    Physical Review Letters
    |June 26, 2026
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    Summary
    This summary is machine-generated.

    Researchers searched for rare B meson decays into strange particles and neutrinos using Belle II data. No significant signal was observed, setting new upper limits on these flavor-changing neutral-current decays.

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    Published on: October 23, 2018

    Area of Science:

    • Particle Physics
    • High Energy Physics
    • B Meson Decays

    Background:

    • Flavor-changing neutral-current (FCNC) decays are rare processes predicted by the Standard Model.
    • Searches for B→X_{s}νν[over ¯] decays provide sensitive probes of new physics beyond the Standard Model.
    • Previous searches have placed constraints on the branching fractions of these decays.

    Purpose of the Study:

    • To perform the first search for the flavor-changing neutral-current decays B→X_{s}νν[over ¯].
    • To set upper limits on the branching fractions for these decays using a large dataset.
    • To constrain new physics models by comparing experimental results with theoretical predictions.

    Main Methods:

    • Utilized data collected with the Belle II detector at the SuperKEKB collider.
    • Reconstructed the B→X_{s}νν[over ¯] decay using a sum-of-exclusives approach with 30 X_{s} decay modes.
    • Analyzed data in three regions of the X_{s} mass to separate contributions from different final states.

    Main Results:

    • No significant signal for B→X_{s}νν[over ¯] decays was observed.
    • Upper limits at 90% confidence level were set on partial branching fractions for different X_{s} mass regions.
    • The combined upper limit on the branching fraction B(B→X_{s}νν[over ¯]) was determined to be less than 3.3×10^{-4}.

    Conclusions:

    • The search provides the most stringent limits to date on B→X_{s}νν[over ¯] decays.
    • The results are consistent with Standard Model predictions.
    • Future analyses with larger datasets will further improve sensitivity to these rare decays.