Description: The inclusive production of eta mesons in tau lepton decay has been studied using the High Resolution Spectrometer at the PEP e/sup +/e/sup -/ facility. The data sample corresponds to an integrated luminosity of 300 pb/sup -1/ and the storage ring was operated at ..sqrt..s = 29 GeV. The eta production appears to be only compatible with the decay tau/sup -/ ..-->.. ..pi../sup -/eta nu, which violates isospin and G-parity conservation. The branching ratio of 5.1 +- 1.5% explains much of the current discrepancy between the one-prong topological branching ratio and the sum of the individual one-prong modes. Various checks to test the validity of the signal are described.
Date: January 1, 1987
Creator: Repond, J.
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