Tau decays involving the eta meson

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Abstract
The decays of the τ lepton which involve the η meson are examined within the standard model. Such modes are prime candidates to comprise the approximately 7% of τ decays (with a one-prong topology) that are not assignable to known exclusive channels. It is shown that the combination of existing electron-positron annihilation data and measurements of five-prong τ decays prevents modes involving the η from contributing more than 2% to one-prong τ decays.