Search for CP violation in τππ0ντ decay

P. Avery et al. (CLEO Collaboration)
Phys. Rev. D 64, 092005 – Published 9 October 2001
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Abstract

We search for CP nonconservation in the decays of τ leptons produced via e+e annihilation at s10.6 GeV. The method uses correlated decays of pairs of τ leptons, each decaying to the ππ0ντ final state. The search is done within the framework of a model with a scalar boson exchange. In an analysis of a data sample corresponding to 12.2×106 produced τ pairs collected with the CLEO detector, we find no evidence of violation of CP symmetry. We obtain a limit on the imaginary part of the coupling constant parametrizing the relative contribution of diagrams that would lead to CP violation to be 0.046<Im(Λ)<0.022 at 90% C.L. This result provides a restriction on CP nonconservation in tau lepton decays. As a cross-check, we study the decay angular distribution and perform a model-independent search for a CP violation effect of a scalar exchange in single τππ0ντ decays. The limit on the imaginary part of the τ scalar coupling is 0.033<Im(Λ)<0.089 at 90% C.L.

  • Received 3 April 2001

DOI:https://doi.org/10.1103/PhysRevD.64.092005

©2001 American Physical Society

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Vol. 64, Iss. 9 — 1 November 2001

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