Phys. Rev. D 64, 092005 (2001) [16 pages]Search for CP violation in τ⃗ππ0ντ decayReceived 3 April 2001; published 9 October 2001 We search for CP nonconservation in the decays of τ leptons produced via e+e- annihilation at √s∼10.6 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 τ⃗ππ0ντ decays. The limit on the imaginary part of the τ scalar coupling is -0.033<Im(Λ)<0.089 at 90% C.L. © 2001 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevD.64.092005
DOI:
10.1103/PhysRevD.64.092005
PACS:
13.20.He, 12.15.Hh, 13.35.Dx, 14.40.Nd
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