Search for second-class currents in tau;{-} --> omegapi;{-}nu_{tau}.

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.