Final states with charged kaons in three-prong tau decays are studied by exploiting the particle identification from the dE/dx measurement. The results are based on a sample of about 1.6 x 10(5) detected tau pairs collected with the ALEPH detector between 1991 and 1995 around the Z peak. The following branching ratios have been measured: B(tau(-) --> K(-)K(+)pi(-)nu(tau)) = (1.63 +/- 0.21 +/- 0.17) x 10(-3), B(tau(-) --> K(-)pi(+)pi(-)nu(tau)) = (2.14 +/- 0.37 +/- 0.29) x 10(-3), B(tau(-) --> K(-)K(+)pi(-)pi(0) nu(tau)) = (0.75 +/- 0.29 +/- 0.15) x 10(-3), and B(tau(-) --> K(-)pi(+)pi(-)pi(0) nu(tau)) = (0.61 +/- 0.39 +/- 0.18) x 10(-3). The first two measurements are more precise than the current world averages, while the last two channels are investigated for the first time. The 95% C.L. upper limit on the branching ratio for the decay tau(-) --> K(-)K(+)K(-)nu(tau) is 0.19 x 10(-3). A study of intermediate states occurring in the K(-)K(+)pi(-)nu(tau), and K(-)pi(+)pi(-)nu(tau), decays is also presented.

Three-prong tau decays with charged kaons

G. Batignani;CIOCCI, MARIA AGNESE;FERRANTE, ISIDORO;MESSINEO, ALBERTO MARIA;TONELLI, GUIDO EMILIO;
1998-01-01

Abstract

Final states with charged kaons in three-prong tau decays are studied by exploiting the particle identification from the dE/dx measurement. The results are based on a sample of about 1.6 x 10(5) detected tau pairs collected with the ALEPH detector between 1991 and 1995 around the Z peak. The following branching ratios have been measured: B(tau(-) --> K(-)K(+)pi(-)nu(tau)) = (1.63 +/- 0.21 +/- 0.17) x 10(-3), B(tau(-) --> K(-)pi(+)pi(-)nu(tau)) = (2.14 +/- 0.37 +/- 0.29) x 10(-3), B(tau(-) --> K(-)K(+)pi(-)pi(0) nu(tau)) = (0.75 +/- 0.29 +/- 0.15) x 10(-3), and B(tau(-) --> K(-)pi(+)pi(-)pi(0) nu(tau)) = (0.61 +/- 0.39 +/- 0.18) x 10(-3). The first two measurements are more precise than the current world averages, while the last two channels are investigated for the first time. The 95% C.L. upper limit on the branching ratio for the decay tau(-) --> K(-)K(+)K(-)nu(tau) is 0.19 x 10(-3). A study of intermediate states occurring in the K(-)K(+)pi(-)nu(tau), and K(-)pi(+)pi(-)nu(tau), decays is also presented.
1998
Barate, R.; Buskulic, D.; Decamp, D.; Ghez, P.; Goy, C.; Lees, J. P.; Lucotte, A.; Minard, M. N.; Nief, J. Y.; Pietrzyk, B.; Casado, M. P.; Chmeissani...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/829002
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