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. Baringer; A. 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

doi:10.1103/PhysRevLett.79.2406

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

Physics and Astronomy (Twin Cities)

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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

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Bergfeld, T., Eisenstein, B. I., Ernst, J., Gladding, G. E., Gollin, G. D., Hans, R. M., Johnson, E., Karliner, I., Marsh, M. A., Palmer, M., Selen, M., Thaler, J. J., Edwards, K. W., Bellerive, A., Janicek, R., MacFarlane, D. B., Patel, P. M., Sadoff, A. J., Ammar, R., ... CLEO Collaboration (1997). First observation of τ → 3πην_τ and τ → f₁ πν_τ decays. Physical review letters, 79(13), 2406-2410. https://doi.org/10.1103/PhysRevLett.79.2406

Bergfeld, T, Eisenstein, BI, Ernst, J, Gladding, GE, Gollin, GD, Hans, RM, Johnson, E, Karliner, I, Marsh, MA, Palmer, M, Selen, M, Thaler, JJ, Edwards, KW, Bellerive, A, Janicek, R, MacFarlane, DB, Patel, PM, Sadoff, AJ, Ammar, R, Baringer, P, Bean, A, Besson, D, Coppage, D, Darling, C, Davis, R, Hancock, N, Kotov, S, Kravchenko, I, Kwak, N, Anderson, S, Kubota, Y, Lee, SJ, O’neill, JJ, Patton, S, Poling, R, Riehle, T, Savinov, V, Smith, A, Alam, MS, Athar, SB, Ling, Z, Mahmood, AH, Severini, H, Timm, S, Wappler, F, Anastassov, A, Blinov, S, Duboscq, JE, Fujino, D, Gan, KK & CLEO Collaboration 1997, 'First observation of τ → 3πην_τ and τ → f₁ πν_τ decays', Physical review letters, vol. 79, no. 13, pp. 2406-2410. https://doi.org/10.1103/PhysRevLett.79.2406

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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 = "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 Gan, {K. K.} and {CLEO Collaboration}",

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doi = "10.1103/PhysRevLett.79.2406",

language = "English (US)",

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

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 - Gan, K. K.

AU - CLEO Collaboration

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.

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U2 - 10.1103/PhysRevLett.79.2406

DO - 10.1103/PhysRevLett.79.2406

M3 - Article

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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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