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Three-prong τ decays with charged kaons

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Abstract

Final states with charged kaons in three-prong τ decays are studied by exploiting the particle identification from the dE/dx measurement. The results are based on a sample of about 1.6 × 105 detected τ pairs collected with the ALEPH detector between 1991 and 1995 around the Z peak. The following branching ratios have been measured: B(τ- → K−K+π−ντ) = (1.63 ± 0.21 ± 0.17) × 10−3, B(τ− → Kπ+πντ) = (2.14 ± 0.37 ± 0.29) × 10−3, B(τ → KK+ππ0ντ) = (0.75 ± 0.29 ± 0.15) × 10−3, and B(τ → Kπ+ππ0ντ) = (0.61 ± 0.39 ± 0.18) × 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 τ → KK+Kντ is 0.19 × 10−3. A study of intermediate states occurring in the KK+πντ and Kπ+πντ decays is also presented.

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Now at CERN, 1211 Geneva 23, Switzerland

Also at CERN, 1211 Geneva 23, Switzerland

Also at Dipartimento di Fisica, INFN, Sezione di Catania, Catania, Italy

Also Istituto di Fisica Generale, Università di Torino, Torino, Italy

Also Istituto di Cosmo-Geofisica del C.N.R., Torino, Italy

Supported by the Commission of the European Communities, contract ERBCHBICT941234

Supported by CICYT, Spain

Supported by the National Science Foundation of China

Supported by the Danish Natural Science Research Council

Supported by the UK Particle Physics and Astronomy Research Council

Supported by the US Department of Energy, grant DEFG0295-ER40896

Supported by the US Department of Energy, contract DEFG05-92ER40742

Supported by the US Department of Energy, contract DEFC05-85ER250000

Supported by the Bundesministerium für Bildung, Wissenschaft, Forschung und Technologie, Germany

Supported by the Direction des Sciences de la Matière, C.E.A.

Supported by Ponds zur Förderung der wissenschaftlichen Forschung, Austria

Also at Istituto di Matematica e Fisica, Università di Sassari, Sassari, Italy

Now at Princeton University, Princeton, NJ 08544, USA

Supported by the US Department of Energy, grant DEFG03-92ER40689

Now at School of Operations Research and Industrial Engineering, Cornell University, Ithaca, NY 14853-3801, USA

Now at Schweizerischer Bankverein, Basel, Switzerland

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ALEPH Collaboration., Barate, R., Buskulic, D. et al. Three-prong τ decays with charged kaons. Eur. Phys. J. C 1, 65–79 (1998). https://doi.org/10.1007/BF01245798

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  • DOI: https://doi.org/10.1007/BF01245798

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