First Observation of tau -> 3 pi eta tau-neutrino and tau -> f1 pi tau-neutrino Decays
- SLAC
We have observed new channels for {tau} decays with an {eta} in the final state. We study 3-prong tau decays, using the {eta} {yields} {gamma}{gamma} and {eta} {yields} 3{pi}{sup 0} decay modes and 1-prong decays with two {pi}{sup 0}'s using the {eta} {yields} {gamma}{gamma} channel. The measured branching fractions are {Beta}({tau}{sup -} {yields} {pi}{sup -}{pi}{sup -}{pi}{sup +}{eta}{nu}{sub {tau}}) = (3.4{sub -0.5}{sup +0.6} {+-} 0.6) x 10{sup -4} and {Beta}({tau}{sup -} {yields} {pi}{sup -}2{pi}{sup 0}{eta}{nu}{sub {tau}}) = (1.4 {+-} 0.6 {+-} 0.3) x 10{sup -4}. We observe clear evidence for f{sub 1} {yields} {eta}{pi}{pi} substructure and measure {Beta}({tau}{sup -} {yields} f{sub 1}{pi}{sup -}{nu}{sub {tau}} ) = (5.8{sub -1.3}{sup +1.4} {+-} 1.8) x 10{sup -4}. We have also searched for {eta}{prime}(958) production and obtain 90% CL upper limits {Beta}({tau}{sup -} {yields} {pi}{sup -}{eta}{prime}{nu}{sub {tau}}) < 7.4 x 10{sup -5} and {Beta}({tau}{sup -} {yields} {pi}{sup -}{pi}{sup 0}{eta}{prime}{nu}{sub {tau}}) < 8.0 x 10{sup -5}.
- Research Organization:
- Stanford Linear Accelerator Center, Menlo Park, CA (US)
- Sponsoring Organization:
- USDOE Office of Science (US)
- DOE Contract Number:
- AC03-76SF00515
- OSTI ID:
- 813066
- Report Number(s):
- SLAC-PUB-9764
- Country of Publication:
- United States
- Language:
- English
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