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First observation of tau->3 pi eta nu(tau) and tau->f(1)pi nu(tau) decays
Ammar, Raymond G. Baringer, Philip S. Bean, Alice Besson, David Zeke Coppage, Don Darling, C. Davis, Robin E. P. Hancock, N. Kotov, S. Kravchenko, I.
Ammar, Raymond G.
Baringer, Philip S.
Bean, Alice
Besson, David Zeke
Coppage, Don
Darling, C.
Davis, Robin E. P.
Hancock, N.
Kotov, S.
Kravchenko, I.
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Abstract
We have observed new channels for tau decays with an eta in the final state. We study 3-prong tau decays, using the eta --> gamma gamma and eta --> 3 pi(0) decay modes and 1-prong decays with two pi(0)'s using the eta --> gamma channel. The measured branching fractions B(tau(-)-->pi(-)pi(-)pi(+)eta nu(tau)) = (3.4-(0.6)(0.5) +/- 0.6) x 10(-4) and B(tau(-) --> pi(-)2 pi(0) eta nu<(tau>)) = (1.4 +/- 0.6 +/- 0.3) x 10(-4). We observe clear evidence for f(1) --> eta pi pi substructure and measure B(pi(-) --> F-1 pi(-)nu(tau)) = (5.8(-1.3)(+1.4) +/- 1.8) x 10(-4). We have also searched for eta'(958) production and obtain 90% C.L. upper limits B(tau(-) --> pi(-)eta'nu(tau)) < 7.4 x 10(-5) 10-5 and B(tau(-) --> pi(-) --> pi(-)pi(0) eta'nu(tau)) < 8.0 x 10(-5).
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1997-09
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AMERICAN PHYSICAL SOC
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Bergfeld, T, Eisenstein, BI, et al. First observation of tau->3 pi eta nu(tau) and tau->f(1)pi nu(tau) decays. PHYSICAL REVIEW LETTERS. September 1997. 79(13) : 2406-2410