Charged Kaon Production in Tau Lepton Decays.
The result of an experiment performed at the PEP e('+)e('-) storage ring which operated at 29.0 GeV/c('2) is presented. The DELCO detector, which emphasizes Cherenkov particle identification, is used to measured the production of charged kaons in (tau) decays. The. branching ratio of the Cabibbo-suppressed decays b((tau)('(+OR-)) (--->) K('(+OR-)) (nu)(,(tau))) = (0.57 (+OR-) 0.15)%, b((tau)('(+OR-)) (--->) K('(+OR-))(nu)(,(tau)) + n(pi)('0)) = (1.59 (+OR-) 0.23)% n (GREATERTHEQ) 0, and. (DIAGRAM, TABLE OR GRAPHIC OMITTED...PLEASE SEE DAI). are measured, and the branching ratio of the Cabibbo -favored decay. (DIAGRAM, TABLE OR GRAPHIC OMITTED...PLEASE SEE DAI). is measured. These branching ratio measurements provide a test e - (mu) - (tau) universality and are in agreement with and the predictions of SU(3) sum rules. The invariant mass distribution of the K('+)K('-)(pi) system in the exclusive (tau)('(+OR-)) (--->) K('+)K('-)(pi)('(+OR -))(nu)(,(tau)) channel is used to set a limit of 157 MeV/c('2) at 95% CL on the (tau) neutrino mass.
- Pub Date:
- Physics: Elementary Particles and High Energy