Measurement of the branching fraction for $$\tau\to\eta K\nu_\tau$$ and a search for second-class currents in $$\tau\to\eta\pi\nu_\tau$$ with $$\eta\to\pi^ \pi^-\pi0$$
The authors report on analyses of tau lepton decays {tau}{sup -} {yields} {eta}K{sup -}{nu}{sub {tau}} and {tau}{sup -} {yields} {eta}{pi}{sup -}{nu}{sub {tau}}, with {eta} {yields} {pi}{sup +}{pi}{sup -}{pi}{sup 0}, using 470 fb{sup -1} of data from the BABAR experiment at PEP-II, collected at center-of-mass energies at and near the {Upsilon}(4S) resonance. They measure the branching fraction for the {tau}{sup -} {yields} {eta}K{sup -}{nu}{sub {tau}} decay mode, {Beta}({tau}{sup -} {yields} {eta}K{sup -}{nu}{sub {tau}}) = (1.42 {+-} 0.11(stat) {+-} 0.07(syst)) x 10{sup -4}, and report a 95% confidence level upper limit for the second-class current process {tau}{sup -} {yields} {eta}{pi}{sup -}{nu}{sub {tau}}, {Beta}({tau}{sup -} {yields} {eta}{pi}{sup -}{nu}{sub {tau}}) < 9.9 x 10{sup -5}.
- Research Organization:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC02-76SF00515
- OSTI ID:
- 1022574
- Report Number(s):
- SLAC-PUB-14307; PRVDAQ; arXiv:1011.3917; TRN: US1104289
- Journal Information:
- Phys.Rev.D83:032002,2011, Vol. 83; ISSN 1550-7998
- Country of Publication:
- United States
- Language:
- English
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Measurement of the {tau}{sup -}{yields}{eta}{pi}{sup -}{pi}{sup +}{pi}{sup -}{nu}{sub {tau}} branching fraction and a search for a second-class current in the {tau}{sup -}{yields}{eta}{sup '}(958){pi}{sup -}{nu}{sub {tau}} decay