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Related Experiment Videos

Search for the decay B+ --> K+nunu.

B Aubert1, R Barate, D Boutigny

  • 1Laboratoire de Physique des Particules, F-74941 Annecy-le-Vieux, France.

Physical Review Letters
|March 24, 2005
PubMed

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Summary
This summary is machine-generated.

Researchers investigated the rare B+ to K+ nu nu decay using BABAR data. The study established an upper limit for this decay, contributing to our understanding of fundamental particle physics.

Area of Science:

  • Particle Physics
  • High-Energy Physics
  • Rare Decays

Background:

  • Flavor-changing neutral-current decays are rare processes predicted by the Standard Model.
  • The B+ to K+ nu nu decay is particularly sensitive to new physics beyond the Standard Model.
  • Previous experimental searches have placed stringent limits on this decay mode.

Purpose of the Study:

  • To search for the rare flavor-changing neutral-current decay B+ to K+ nu nu.
  • To set an upper limit on the branching fraction of this decay using BABAR data.
  • To constrain new physics models by comparing experimental results with theoretical predictions.

Main Methods:

  • Analysis of a data sample of 82 fb(-1) collected with the BABAR detector at the PEP-II B-factory.
  • Signal event selection by examining the properties of the system recoiling against reconstructed hadronic or semileptonic charged-B decays.

Related Experiment Videos

  • Independent analysis using both hadronic and semileptonic B decay reconstructions.

    • Main Results:

    • A combined upper limit of B(B+ to K+ nu nu) < 5.2 x 10^-5 at the 90% confidence level was obtained.
    • An additional limit for the B+ to pi+ nu nu decay was set at B(B+ to pi+ nu nu) < 1.0 x 10^-4 using hadronic B reconstruction.
    • These results are consistent with Standard Model expectations and place constraints on new physics scenarios.

    Conclusions:

    • The search for B+ to K+ nu nu did not yield a signal, leading to a new upper limit on its branching fraction.
    • The obtained limits provide valuable constraints for theoretical models aiming to explain flavor-changing neutral-current processes.
    • This study highlights the sensitivity of B-factory experiments to rare decay modes and their potential to probe new physics.