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First observation of the decay tau(-)->K-eta nu(tau)

Ammar, Raymond G.
; 
Baringer, Philip S.
; 
Bean, Alice
; 
Besson, David Zeke
; 
Coppage, Don
; 
Copty, N.
; 
Davis, Robin E. P.
; 
Hancock, N.
; 
Kotov, S.
; 
Kravchenko, I.
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Abstract
The decay tau(-) --> K- eta nu(tau), has been observed with the CLEO II detector. The eta meson is reconstructed using two decay channels, eta --> gamma gamma and pi(+)pi(-)pi(0). The measured branching fraction is B(tau(-) --> K- eta nu(tau)) = (2.6 +/- 0.5 +/- 0.4) x 10(-4), somewhat higher than theoretical estimates. An improved upper limit for the second-class-current decay tau(-) --> pi(-) eta nu(tau) is set, B(tau(-) --> pi(-) eta nu(tau)) < 1.4 x 10(-4) at 95% C.L., consistent with theoretical expectations.
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1996-05
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AMERICAN PHYSICAL SOC
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Physics & Astronomy Scholarly Works
Center for Russian, East European, and Eurasian Studies Scholarly Publications
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Bartelt, J, Csorna, SE, et al. First observation of the decay tau(-)->K-eta nu(tau). PHYSICAL REVIEW LETTERS. May 1996. 76(22) : 4119-4123.
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https://hdl.handle.net/1808/1404
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