We estimate various sources of the τ→ντηπ process by using QCD-duality sum rule information on the decay constants of standard and exotic mesons. We use the π→ |ν| decay in order to constrain the effects of new interactions. We conclude from our analysis that in al cases, the τ→ντηπ branching ration is small. We also point out that the present data on the τ→νπ process already provide an upper limit of 0.1% on the ηπ mode while the τ→ντKKdata imply an upper limit of 0.5% if the a0 (980)- meson is a four-quark state.

This work has been partly supported by the DRCI of CNRS with the France-Spain exchange program: A.I. Quantum Chromodynamics No. 95-31-82, by the University of Montpellier and by CAICYT (Spain) under grant No. 1740/82.

4 páginas.-- CERN-TH-4737-87.

Peer reviewed