First observation of τ → 3πηντ and τ → f1 πντ decays

T. Bergfeld, B. I. Eisenstein, J. Ernst, G. E. Gladding, G. D. Gollin, R. M. Hans, E. Johnson, I. Karliner, M. A. Marsh, M. Palmer, M. Selen, J. J. Thaler, K. W. Edwards, A. Bellerive, R. Janicek, D. B. MacFarlane, P. M. Patel, A. J. Sadoff, R. Ammar, P. BaringerA. Bean, D. Besson, D. Coppage, C. Darling, R. Davis, N. Hancock, S. Kotov, I. Kravchenko, N. Kwak, S. Anderson, Y. Kubota, S. J. Lee, J. J. O’neill, S. Patton, R. Poling, T. Riehle, V. Savinov, A. Smith, M. S. Alam, S. B. Athar, Z. Ling, A. H. Mahmood, H. Severini, S. Timm, F. Wappler, A. Anastassov, S. Blinov, J. E. Duboscq, D. Fujino, K. K. Gan, CLEO Collaboration

Research output: Contribution to journalArticlepeer-review

33 Scopus citations


We have observed new channels for τ decays with an η in the final state. We study 3-prong tau decays, using the η → γγ and η → 3π0 decay modes and 1-prong decays with two π0’s using the η → γγ channel. The measured branching fractions are B(τ → πππ+ηντ = (3.4+0.6-0.5 ± 0.6) × 10-4 and B(τ → π0ηντ = (1.4 ± 0.6 ± 0.3) × 10-4. We observe clear evidence for f1 → ηππ substructure and measure B(τ → f1πντ) = (5.8+1.4-1.3 ± 1.8) × 10-4. We have also searched for η′(958) production and obtain 90% C.L. upper limits B(τ → πη′ντ) < 7.4 × 10-5 and B(τ → ππ0η′ντ) < 8.0 × 10-5.

Original languageEnglish (US)
Pages (from-to)2406-2410
Number of pages5
JournalPhysical review letters
Issue number13
StatePublished - Sep 29 1997


Dive into the research topics of 'First observation of τ → 3πηντ and τ → f1 πντ decays'. Together they form a unique fingerprint.

Cite this