Abstract
We have studied the τ→νρ 0 π decay in data taken with the PLUTO detector at the DORISe + e − storage ring, at CM energies from 4 to 5 GeV. We have found 27 events with the τ→νρ 0 π decay mode corresponding to a branching ratio ofB=(5.4±1.7)%. The Dalitz plot and theρ 0 π mass spectrum are analysed for the ρπ partial wave and spin state. Only theρ 0 π s-wave as produced by the axial vector current gives a good description. Theρ 0 π mass spectrum is suggestive of anA 1 resonance. An upper limit on τ±→vπ ± π + π − withoutρ 0 formation is given.
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