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Construction and Characterization of External Cavity Diode Lasers for Atomic Physics
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Search for the rare decay B-->pil+ l-.

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
|October 13, 2007
PubMed
Summary

Researchers found no evidence for flavor-changing neutral-current decays (B-->pil+l-) or lepton-flavor-violating decays (B-->pie+/-mu-/+) in B meson decays. Upper limits were set on their branching fractions, contributing to our understanding of rare particle physics processes.

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Area of Science:

  • Particle Physics
  • High Energy Physics
  • Quantum Chromodynamics

Background:

  • Flavor-changing neutral-current (FCNC) decays are rare processes predicted by the Standard Model.
  • Lepton flavor violation (LFV) is a phenomenon not explained by the Standard Model.
  • B meson decays provide a sensitive probe for new physics beyond the Standard Model.

Purpose of the Study:

  • To search for the FCNC decays B-->pil+l- (where l+l- is e+e- or mu+mu-).
  • To search for the LFV decays B-->pie+/-mu-/+.
  • To set upper limits on the branching fractions of these rare decays.

Main Methods:

  • Analysis of 230 x 10^6 Upsilon(4S)-->BB decays collected by the BABAR detector.
  • Event reconstruction and selection for B-->pil+l- and B-->pie+/-mu-/+ decay modes.
  • Statistical analysis to set upper limits at 90% confidence level.

Main Results:

  • No significant signal was observed for B-->pil+l- decays.
  • An upper limit on the isospin-averaged branching fraction for B-->pil+l- was set at B(B-->pil+l-)<9.1 x 10^-8.
  • No significant signal was observed for B-->pie+/-mu-/+ decays.
  • An upper limit on the isospin-averaged branching fraction for B-->pie+/-mu-/+ was set at B(B-->pie+/-mu-/+)<9.2 x 10^-8.

Conclusions:

  • The experimental results place stringent constraints on the branching fractions of B-->pil+l- and B-->pie+/-mu-/+ decays.
  • These findings are consistent with Standard Model predictions for FCNC decays and place limits on potential new physics scenarios that could enhance LFV decays.
  • The study contributes to the ongoing effort to precisely measure B meson properties and search for deviations from the Standard Model.