First Search for CP Violation in Tau Lepton Decay

Details First Search for CP Violation in Tau Lepton Decay First Search for CP Violation in Tau Lepton Decay

1998-05-22

arxiv.org/abs/hep-ex/9805027v1

Phys.Rev.Lett.81:3823-3827,1998

Physics

High Energy Physics

High Energy Physics - Experiment

9 pages, 4 Postscript figures, postscript file also available through http://w4.lns.cornell.edu/public/CLNS

Scientific paper

10.1103/PhysRevLett.81.3823

Using the CLEO II detector we have performed the first search for $CP$ violation in tau lepton decay. CP violation in lepton decay does not occur in the minimal standard model but can occur in extensions such as the multi-Higgs doublet model. It appears as a characteristic difference between the $\tau^+$ and $\tau^-$ decay angular distributions for the semi-leptonic decay modes such as $\tau^- \to K^0 \pi^- \nu$. We define an observable asymmetry to exploit this and find no evidence for any CP violation.

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