One-prong τ decays with kaons

R. Barate, D. Decamp, P. Ghez, C. Goy, J. P. Lees, E. Merle, M. N. Minard, B. Pietrzyk, R. Alemany, M. P. Casado, M. Chmeissani, J. M. Crespo, E. Fernandez, M. Fernandez-Bosman, Ll Garrido, E. Graugès, A. Juste, M. Martinez, G. Merino, R. MiquelLl M. Mir, A. Pacheco, I. C. Park, I. Riu, A. Colaleo, D. Creanza, M. De Palma, G. Gelao, G. Iaselli, G. Maggi, M. Maggi, S. Nuzzo, A. Ranieri, G. Raso, F. Ruggieri, G. Selvaggi, L. Silvestris, P. Tempesta, A. Tricomi, G. Zito, X. Huang, J. Lin, Q. Ouyang, T. Wang, Y. Xie, R. Xu, S. Xue, J. Zhang, L. Zhang, W. Zhao, D. Abbaneo, U. Becker, G. Boix, M. Cattaneo, V. Ciulli, G. Dissertori, H. Drevermann, R. W. Forty, M. Frank, A. W. Halley, J. B. Hansen, J. Harvey, P. Janot, B. Jost, I. Lehraus, O. Leroy, P. Mato, A. Minten, A. Moutoussi, F. Ranjard, L. Rolandi, D. Rousseau, D. Schlatter, M. Schmitt, O. Schneider, W. Tejessy, F. Teubert, I. R. Tomalin, E. Tournefier, A. E. Wright, Z. Ajaltouni, F. Badaud, G. Chazelle, O. Deschamps, A. Falvard, C. Ferdi, P. Gay, C. Guicheney, P. Henrard, J. Jousset, B. Michel, S. Monteil, J. C. Montret, D. Pallin, P. Perret, F. Podlyski, J. D. Hansen, J. R. Hansen, P. H. Hansen, B. S. Nilsson

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21 Citations (Scopus)


One-prong τ decays into final states involving kaons are studied with about 161 000 τ+τ-events collected by the ALEPH detector from 1991 to 1995. Charged kaons are identified by dE/dx measurement, while K0L's are detected through their interaction in calorimeters. Branching ratios are measured for the inclusive mode, B(τ-→ K-Xντ) = (1.52±0.04±0.04)%, where X can be any system of neutral particles, and for the exclusive modes B(τ-→ K-ντ) = (6.96 ± 0.25 ± 0.14) × 10-3, B(τ-→ K-π0ντ) = (4.44 ± 0.26 ± 0.24) × 10-3, B(τ-→ K-π0π0ντ) = (0.56 ± 0.20 ± 0.15) × 10-3, B(τ-→ K-π0π0π0ντ) = (0.37 ± 0.21 ± 0.11) × 10-3, B(τ-→ K-K0ντ) = (1.62 ± 0.21 ± 0.11) × 10-3, B(τ-→ K-K0π0ντ) = (1.43 ± 0.25 ± 0.15) × 10-3, B(τ-→ K0π-ντ) = (9.28 ± 0.45 ±0.34) × 10-3. B(τ-→ K0π-π0ντ) = (3.47 ± 0.53 ± 0.37) × 10-3. where the first error is statistical and the second is systematical. Upper limits for B(τ-→ K0π-π0π0ντ) and B(τ-→ K-K0π0π0ντ) are also obtained. Mass spectra in the final states are investigated in order to study the relevant dynamics.
Original languageEnglish
Pages (from-to)1-18
JournalEuropean Physical Journal C
Issue number1
Publication statusPublished - 1 Jan 1999


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