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

CLEO Collaboration

doi:10.1103/PhysRevLett.79.2406

First observation of τ → 3πην_τ and τ → f₁ πν_τ decays

CLEO Collaboration

Research output: Contribution to journal › Article › peer-review

33 Scopus citations

Abstract

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 → π⁻π⁻π⁺ην_τ = (3.4^+0.6_-0.5 ± 0.6) × 10^-4 and B(τ⁻ → π⁻2π⁰ην_τ = (1.4 ± 0.6 ± 0.3) × 10^-4. We observe clear evidence for f₁ → ηππ substructure and measure B(τ⁻ → f₁π⁻ν_τ) = (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 → π⁻η′ν_τ) < 7.4 × 10^-5 and B(τ → π⁻π⁰η′ν_τ) < 8.0 × 10^-5.

Original language	English (US)
Pages (from-to)	2406-2410
Number of pages	5
Journal	Physical review letters
Volume	79
Issue number	13
DOIs	https://doi.org/10.1103/PhysRevLett.79.2406
State	Published - Sep 29 1997
Externally published	Yes

All Science Journal Classification (ASJC) codes

General Physics and Astronomy

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10.1103/PhysRevLett.79.2406

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@article{705b245180e64adbb79e3bcc2ab20abd,

title = "First observation of τ → 3πηντ and τ → f1 πντ decays",

abstract = "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{\textquoteright}s using the η → γγ channel. The measured branching fractions are B(τ → π−π−π+ηντ = (3.4+0.6-0.5 ± 0.6) × 10-4 and B(τ− → π−2π0ηντ = (1.4 ± 0.6 ± 0.3) × 10-4. We observe clear evidence for f1 → ηππ substructure and measure B(τ− → f1π−ντ) = (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 → π−η′ντ) < 7.4 × 10-5 and B(τ → π−π0η′ντ) < 8.0 × 10-5.",

author = "\{CLEO Collaboration\} and T. Bergfeld and Eisenstein, \{B. I.\} and J. Ernst and Gladding, \{G. E.\} and Gollin, \{G. D.\} and Hans, \{R. M.\} and E. Johnson and I. Karliner and Marsh, \{M. A.\} and M. Palmer and M. Selen and Thaler, \{J. J.\} and Edwards, \{K. W.\} and A. Bellerive and R. Janicek and MacFarlane, \{D. B.\} and Patel, \{P. M.\} and Sadoff, \{A. J.\} and R. Ammar and P. Baringer and A. Bean and D. Besson and D. Coppage and C. Darling and R. Davis and N. Hancock and S. Kotov and I. Kravchenko and N. Kwak and S. Anderson and Y. Kubota and Lee, \{S. J.\} and O{\textquoteright}neill, \{J. J.\} and S. Patton and R. Poling and T. Riehle and V. Savinov and A. Smith and Alam, \{M. S.\} and Athar, \{S. B.\} and Z. Ling and Mahmood, \{A. H.\} and H. Severini and S. Timm and F. Wappler and A. Anastassov and S. Blinov and Duboscq, \{J. E.\} and D. Fujino and Lange, \{D. J.\}",

year = "1997",

month = sep,

day = "29",

doi = "10.1103/PhysRevLett.79.2406",

language = "English (US)",

volume = "79",

pages = "2406--2410",

journal = "Physical review letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "13",

}

TY - JOUR

T1 - First observation of τ → 3πηντ and τ → f1 πντ decays

AU - CLEO Collaboration

AU - Bergfeld, T.

AU - Eisenstein, B. I.

AU - Ernst, J.

AU - Gladding, G. E.

AU - Gollin, G. D.

AU - Hans, R. M.

AU - Johnson, E.

AU - Karliner, I.

AU - Marsh, M. A.

AU - Palmer, M.

AU - Selen, M.

AU - Thaler, J. J.

AU - Edwards, K. W.

AU - Bellerive, A.

AU - Janicek, R.

AU - MacFarlane, D. B.

AU - Patel, P. M.

AU - Sadoff, A. J.

AU - Ammar, R.

AU - Baringer, P.

AU - Bean, A.

AU - Besson, D.

AU - Coppage, D.

AU - Darling, C.

AU - Davis, R.

AU - Hancock, N.

AU - Kotov, S.

AU - Kravchenko, I.

AU - Kwak, N.

AU - Anderson, S.

AU - Kubota, Y.

AU - Lee, S. J.

AU - O’neill, J. J.

AU - Patton, S.

AU - Poling, R.

AU - Riehle, T.

AU - Savinov, V.

AU - Smith, A.

AU - Alam, M. S.

AU - Athar, S. B.

AU - Ling, Z.

AU - Mahmood, A. H.

AU - Severini, H.

AU - Timm, S.

AU - Wappler, F.

AU - Anastassov, A.

AU - Blinov, S.

AU - Duboscq, J. E.

AU - Fujino, D.

AU - Lange, D. J.

PY - 1997/9/29

Y1 - 1997/9/29

N2 - 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 → π−π−π+ηντ = (3.4+0.6-0.5 ± 0.6) × 10-4 and B(τ− → π−2π0ηντ = (1.4 ± 0.6 ± 0.3) × 10-4. We observe clear evidence for f1 → ηππ substructure and measure B(τ− → f1π−ντ) = (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 → π−η′ντ) < 7.4 × 10-5 and B(τ → π−π0η′ντ) < 8.0 × 10-5.

AB - 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 → π−π−π+ηντ = (3.4+0.6-0.5 ± 0.6) × 10-4 and B(τ− → π−2π0ηντ = (1.4 ± 0.6 ± 0.3) × 10-4. We observe clear evidence for f1 → ηππ substructure and measure B(τ− → f1π−ντ) = (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 → π−η′ντ) < 7.4 × 10-5 and B(τ → π−π0η′ντ) < 8.0 × 10-5.

UR - https://www.scopus.com/pages/publications/4243818953

UR - https://www.scopus.com/pages/publications/4243818953#tab=citedBy

U2 - 10.1103/PhysRevLett.79.2406

DO - 10.1103/PhysRevLett.79.2406

M3 - Article

AN - SCOPUS:4243818953

SN - 0031-9007

VL - 79

SP - 2406

EP - 2410

JO - Physical review letters

JF - Physical review letters

IS - 13

ER -

First observation of τ → 3πην_τ and τ → f₁ πν_τ decays

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