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Search for B^{+}→K^{+}νν[over ¯] Decays Using an Inclusive Tagging Method at Belle II.

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  • 1INFN Sezione di Trieste, I-34127 Trieste.

Physical Review Letters
|November 12, 2021
PubMed
Summary
This summary is machine-generated.

Researchers searched for a rare B meson decay (B+→K+νν̄) at Belle II. No significant signal was observed, leading to an upper limit on its branching fraction.

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Area of Science:

  • Particle Physics
  • High-Energy Physics
  • Experimental Physics

Background:

  • Flavor-changing neutral-current (FCNC) decays are rare processes predicted by the Standard Model.
  • Observing FCNC decays can reveal new physics beyond the Standard Model.
  • The decay B+→K+νν̄ is a prime channel to search for New Physics.

Purpose of the Study:

  • To search for the FCNC decay B+→K+νν̄ at the Belle II experiment.
  • To set an upper limit on the branching fraction of this decay.
  • To constrain new physics models by searching for this rare decay.

Main Methods:

  • Utilized data from the Belle II experiment at the SuperKEKB collider.
  • Employed a novel inclusive tagging approach to suppress backgrounds.
  • Analyzed a data sample of 63 fb⁻¹ at the ϒ(4S) resonance and 9 fb⁻¹ below resonance.

Main Results:

  • No significant signal for the B+→K+νν̄ decay was observed.
  • An upper limit on the branching fraction was set at 4.1×10⁻⁵ at the 90% confidence level.
  • The inclusive tagging method demonstrated improved signal efficiency.

Conclusions:

  • The search for B+→K+νν̄ did not yield a significant signal.
  • The obtained upper limit provides constraints on new physics scenarios.
  • Further data collection at Belle II will improve sensitivity to this rare decay.