Evidence for the τ → νϱπ decay mode

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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Annihilation of e+e- into final states with a single electron has been studied with the PLUTO detector at the DORIS storage ring at CMS energies from 3.6 to 5 GeV. In the sample of 4-prong events without any detected photon we observe 21 events which we assign to the reaction e+e- → τ+τ- → ννe + νρ{variant}0π. We obtain a branching ratio for τ+ → νρ{variant}0π+ of 0.050 ± 0.015 with an overall systematic uncertainty of 30%. The data are consistent with the ρ{variant}π coming from an A1 meson.

Original languageEnglish
Pages (from-to)99-104
Number of pages6
JournalPhysics Letters B
Issue number1
StatePublished - 30 Jan 1978
Externally publishedYes


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