Measurement of the b → τ<sup>-</sup> ν -<inf>τ</inf>X branching ratio and an upper limit on B<sup>-</sup> → τ<sup>-</sup> ν -<inf>τ</inf>

D. Buskulic, D. Casper, I. De Bonis, D. Decamp, P. Ghez, C. Goy, J. P. Lees, M. N. Minard, P. Odier, B. Pietrzyk, F. Ariztizabal, M. Chmeissani, J. M. Crespo, I. Efthymiopoulos, E. Fernandez, M. Fernandez-Bosman, V. Gaitan, Ll Garrido, M. Martinez, S. OrteuA. Pacheco, C. Padilla, F. Palla, A. Pascual, J. A. Perlas, F. Sanchez, F. Teubert, D. Creanza, M. de Palma, A. Farilla, G. Iaselli, G. Maggi, N. Marinelli, S. Natali, S. Nuzzo, A. Ranieri, G. Raso, F. Romano, F. Ruggieri, G. Selvaggi, L. Silvestris, P. Tempesta, G. Zito, X. Huang, J. Lin, Q. Ouyang, T. Wang, Y. Xie, R. Xu, S. Xue, J. Zhang, L. Zhang, W. Zhao, G. Bonvicini, J. Boudreau, P. Comas, P. Coyle, H. Drevermann, A. Engelhardt, R. W. Forty, M. Frank, G. Ganis, C. Gay, M. Girone, R. Hagelberg, J. Harvey, R. Jacobsen, B. Jost, J. Knobloch, I. Lehraus, M. Maggi, C. Markou, E. B. Martin, P. Mato, H. Meinhard, A. Minten, R. Miquel, P. Palazzi, J. R. Pater, P. Perrodo, J. F. Pusztaszeri, F. Ranjard, L. Rolandi, D. Schlatter, M. Schmelling, W. Tejessy, I. R. Tomalin, R. Veenhof, A. Venturi, H. Wachsmuth, W. Wiedenmann, W. Witzeling, J. Wotschack, Z. Ajaltouni, M. Bardadin-Otwinowska, A. Barres, C. Boyer, A. Falvard, P. Gay, C. Guicheney

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Abstract

Using 1.45 million hadronic Z decays collected by the ALEPH experiment at LEP, the b → τ- ν -τX branching ratio is measured to be 2.75 ± 0.30 ± 0.37%. In addition an upper limit of 1.8 × 10-3 at 90% confidence level is placed upon the exclusive branching ratio of B- → τ- ν -τ. These measurements are consistent with SM expectations, and put the constraint tan β Mh± < 0.52 GeV-1 at 90% confidence level on all Type II two Higgs doublet models (such as the MSSM). © 1995.
Original languageEnglish
Pages (from-to)444-452
JournalPhysics Letters B
Volume343
Issue number1-4
DOIs
Publication statusPublished - 19 Jan 1995

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