CP Violation Search in $\tau\to \pi\pi^0\nu_{\tau}$ Decays

Abstract

Using a sample of 12.2 million $\tau$-lepton pairs produced by $e^+e^-$ annihilation at $\sqrt{s}\sim 10.6 $GeV and collected by the CLEO detector, we search for and set limits on CP violation in $\tau$-lepton decays. For each event, we require that both $\tau$-leptons decay via the mode $\tau\ra \pi\pi^0\nu$. The search is performed within the context of a multi-Higgs Doublet Model and the imaginary part of the coupling constant parameterizing the non-Standard Model diagram leading to CP violation is constrained to be $-0.046 < \Im{(\Lambda}) < 0.022$ at 90% CL. The novel search technique is of general utility.