First observation of the decay {bold {tau}}{sup {bold {minus}}}{bold {r_arrow}}{ital K}{sup {bold {minus}}}{bold {eta}}{bold {nu}}{sub {bold {tau}}}
The decay {tau}{sup {minus}}{r_arrow}{ital K}{sup {minus}}{eta}{nu}{sub {tau}} has been observed with the CLEO II detector. The {eta} meson is re- constructed using two decay channels, {eta}{r_arrow}{gamma}{gamma} and {pi}{sup +}{pi}{sup {minus}}{pi}{sup 0}. The measured branching fraction is {ital B}({tau}{sup {minus}}{r_arrow}{ital K}{sup {minus}}{eta}{nu}{sub {tau}})=(2.6{plus_minus}0.5{plus_minus}0.4){times}10{sup {minus}4}, somewhat higher than theoretical estimates. An improved upper limit for the second-class-current decay {tau}{sup {minus}}{r_arrow}{pi}{sup {minus}}{eta}{nu}{sub {tau}} is set, {ital B}({tau}{sup {minus}}{r_arrow}{pi}{sup {minus}}{eta}{nu}{sub {tau}}){lt}1.4{times}10{sup {minus}4} at 95{percent} C.L., consistent with the theoretical expectations. {copyright} {ital 1996 The American Physical Society.}
- OSTI ID:
- 285734
- Journal Information:
- Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 22 Vol. 76; ISSN 0031-9007; ISSN PRLTAO
- Country of Publication:
- United States
- Language:
- English
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