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Types of Radioactivity

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Radioactive Decay and Radiometric Dating02:48

Radioactive Decay and Radiometric Dating

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Nuclear Stability03:18

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Nuclear Transmutation03:20

Nuclear Transmutation

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Search for the Decay B+-->K+ tau-/+ mu+/-.

B Aubert1, M Bona, D Boutigny

  • 1Laboratoire de Physique des Particules, IN2P3/CNRS et Université de Savoie, F-74941 Annecy-Le-Vieux, France.

Physical Review Letters
|February 1, 2008
PubMed
Summary

Researchers searched for a rare B+ meson decay involving tau and muon leptons. No evidence was found, setting a new upper limit on this decay

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Area of Science:

  • Particle Physics
  • High-Energy Physics
  • Experimental Physics

Background:

  • Lepton flavor violation (LFV) is a key signature of physics beyond the Standard Model.
  • The B+ meson system provides a sensitive probe for new physics due to its rich decay modes.

Purpose of the Study:

  • To search for the lepton flavor violating decay B+ -> K+ tau mu.
  • To constrain new physics models by setting limits on the branching fraction of this decay.

Main Methods:

  • Analysis of 383 x 10^6 BBbar events collected by the BABAR detector.
  • Full reconstruction of the signal B+ meson candidate in hadronic decay modes.
  • Reconstruction of tau lepton kinematics from its decay products and other event information.

Main Results:

  • Observed no significant excess of events beyond the expected background.
  • Set an upper limit on the branching fraction B(B+ -> K+ tau mu) < 7.7 x 10^-5 at 90% confidence level.
  • Improved model-independent bounds on the energy scale of flavor-changing new physics.

Conclusions:

  • The absence of signal is consistent with the Standard Model but places stringent constraints on new physics scenarios.
  • This search contributes to the ongoing effort to uncover new fundamental particles and interactions.