Spin parity analysis of the decay τ→νρπ

W. Wagner, G. Alexander, L. Criegee, H. C. Dehne, R. Devenish, G. Flügge, J. D. Fox, G. Franke, Ch Gerke, E. Hackmack, P. Harms, Th Kahl, G. Knies, E. Lehmann, R. Schmitz, U. Timm, P. Waloschek, G. G. Winter, W. Zimmermann, V. BlobelA. F. Garfinkel, B. Koppitz, W. Lührsen, A. Bäcker, J. Bürger, K. Derikum, C. Grupen, H. Meyer, M. Rössler, K. Wacker

Research output: Contribution to journalArticlepeer-review


We have studied the τ→νρ0π decay in data taken with the PLUTO detector at the DORIS e+e- storage ring, at CM energies from 4 to 5 GeV. We have found 27 events with the τ→νρ0π decay mode corresponding to a branching ratio of B=(5.4±1.7)%. The Dalitz plot and the ρ0π mass spectrum are analysed for the ρπ partial wave and spin state. Only the ρ0πs-wave as produced by the axial vector current gives a good description. The ρ0π mass spectrum is suggestive of an A1 resonance. An upper limit on τ±→vπ±π+π- without ρ0 formation is given.

Original languageEnglish
Pages (from-to)193-198
Number of pages6
JournalEuropean Physical Journal C
Issue number3
StatePublished - Sep 1980
Externally publishedYes


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