R. Akers et al., MEASUREMENT OF THE TAU(-)-]H(-)H(-)NU(TAU) AND -)H(+)H(-)GREATER-THAN-OR-EQUAL-TO-1-PI(0)NU(TAU), BRANCHING RATIOS()H(), Zeitschrift fur Physik. C, Particles and fields, 68(4), 1995, pp. 555-567
The branching ratios of the tau(-) --> h(-)h(+)h(-)nu(tau) and tau(-)
--> h(-)h(+)h(-) greater than or equal to 1 pi(o) nu(tau) decays, wher
e h is either a charged pi or K meson, are measured using a data sampl
e of 87861 tau(+)tau(-) pairs collected with the OPAL detector at LEP.
The two branching ratios are extracted simultaneously from a sample o
f three charged particle decays and found to be: B(tau(-) --> h(-)h(+)
h(-)nu tau) = (9.87 +/- 0.10 +/- 0.24)% B(tau(-) --> h(-)h(+)h(-) grea
ter than or equal to 1 pi(o) nu(tau)) = (5.09 +/- 0.10 +/- 0.23)%where
the first error is statistical and the second systematic. The branchi
ng ratio of the tau lepton into three charged particles is measured to
be: B(tau(-) --> 3-prong) = (14.96 +/- 0.09 +/- 0.22)%