Measurements of BR(b → τ<sup>-</sup>ν̄<inf>τ</inf>X) and BR(b → τ<sup>-</sup>ν̄<inf>τ</inf>D*<sup>±</sup>X) and upper limits on BR(B<sup>-</sup> → τ<sup>-</sup>ν̄<inf>τ</inf>) and BR(b → sνν̄)

R. Barate, D. Decamp, P. Ghez, C. Goy, J. P. Lees, E. Merle, M. N. Minard, P. Perrodo, B. Pietrzyk, S. Bravo, M. P. Casado, M. Chmeissani, J. M. Crespo, E. Fernandez, M. Fernandez-Bosman, Ll Garrido, E. Grauǵes, M. Martinez, G. Merino, R. MiquelLl M. Mir, A. Pacheco, A. Pascual, H. Ruiz, A. Colaleo, D. Creanza, M. de Palma, G. Iaselli, G. Maggi, M. Maggi, A. Ranieri, A. 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, G. Boix, O. Buchm̈uller, M. Cattaneo, F. Cerutti, G. Dissertori, H. Drevermann, R. W. Forty, M. Frank, T. C. Greening, J. B. Hansen, J. Harvey, P. Janot, B. Jost, I. Lehraus, P. Mato, A. Minten, A. Moutoussi, F. Ranjard, L. Rolandi, D. Schlatter, M. Schmitt, O. Schneider, P. Spagnolo, W. Tejessy, F. Teubert, E. Tournefier, A. E. Wright, Z. Ajaltouni, F. Badaud, G. Chazelle, O. Deschamps, A. Falvard, 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, A. Wäänänen, G. Daskalakis, A. Kyriakis, C. Markou, E. Simopoulou

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80 Citations (Scopus)

Abstract

Inclusive branching ratios involving b → τ transitions are measured in approximately four million hadronic Z decays collected by the ALEPH detector at LEP. The fully-inclusive branching ratio BR(b → τ-ν̄τX) and the semi-inclusive branching ratio BR(b → τ-ν̄τD*±X) are measured to be (2.43 ± 0.20 ± 0.25)% and (0.88 ± 0.31 ± 0.28)%, in agreement with the standard model predictions. Upper limits on the branching fractions BR(B- → τ-v̄τ) and BR(b → sνν̄) are set to 8.3 × 10-4 and 6.4 × 10-4 at the 90% C.L. These results allow a 90% C.L. lower limit of 0.40 (GeV/c2)-1 to be set on the tan β/mH± ratio, in the framework of type-II two-Higgs-doublet models.
Original languageEnglish
Pages (from-to)213-227
JournalEuropean Physical Journal C
Volume19
Issue number2
Publication statusPublished - 1 Jan 2001

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