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Setting Limits on Supersymmetry Using Simplified Models
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Search for second-class currents in tau;{-} --> omegapi;{-}nu_{tau}.

B Aubert1, Y Karyotakis, J P Lees

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Researchers analyzed tau decays into omega pi and found no evidence for second-class currents. An upper limit was set for their fraction in this tau decay mode, contributing to particle physics understanding.

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Area of Science:

  • Particle Physics
  • High-Energy Physics
  • Hadron Spectroscopy

Background:

  • The Standard Model of particle physics allows for different types of currents.
  • Second-class currents in tau decays are a subject of theoretical interest and experimental investigation.
  • Understanding tau decay modes provides insights into fundamental interactions.

Purpose of the Study:

  • To search for evidence of second-class currents in the tau- decay to omega pi- nu_tau decay channel.
  • To set an experimental limit on the contribution of second-class currents to this specific tau decay.

Main Methods:

  • Analysis of approximately 320 million tau-lepton pairs collected by the BABAR detector.
  • Reconstruction of the tau- -> omega pi- nu_tau decay, with omega decaying into pi+ pi- pi0.
  • Statistical analysis to determine the presence and fraction of second-class currents.

Main Results:

  • No significant evidence for the presence of second-class currents was observed in the studied decay mode.
  • An upper limit of 0.69% at the 90% confidence level was established for the fraction of second-class currents.

Conclusions:

  • The results are consistent with the absence of second-class currents in tau- -> omega pi- nu_tau decays.
  • This study places constraints on new physics beyond the Standard Model that might manifest as second-class currents.