Measurement of the branching ratio for the process b ->tau(-)(nu)over-bar(tau)X

Giovanni Abbiendi,C. Ainsley, P. F. Åkesson,Gideon Alexander, J. Allison,Georgios Anagnostou,K. J. Anderson,Silvia Arcelli,Shoji Asai, D. Axen, Georges Azuelos, I. R. Bailey, E. L. Barberio,R. J. Barlow,Richard Batley,T. Behnke, K. W. Bell,P. J. Bell,Gideon Bella,Alain Bellerive,Siegfried Bethke,Otmar Biebel, I. J. Bloodworth, Oana Elena Vickey Boeriu, P. Bock,J. Böhme, Daniele Bonacorsi, M. Boutemeur,S. Braibant, L. Brigliadori,R. M. Brown, H. J. Burckhart,J. Cammin, R. K. Carnegie, B. Caron, A. A. Carter, Carter,C. Y. Chang, D. G. Charlton,Pel Clarke,E. Clay,I. Cohen, J. Couchman, A. Csilling,Marco Cuffiani,Shlomo Dado, G. M. Dallavalle, S.J. Dallison,A. De Roeck,E. A. De Wolf,Paul Dervan, Klaus Kurt Desch, Beatrix Dienes, Dixit, M. Donkers, J. Dubbert, Ehud Duchovni, G. Duckeck, I. P. Duerdoth, Erez Etzion,Fabrizio Fabbri,Lutz Feld,Pamela Ferrari,Frank Fiedler, I. Fleck, M. Ford, A. Frey, A Furtjes, David Futyan,P. Gagnon, J. W. Gary, Goetz Gaycken,Christoph Geich-Gimbel, G. Giacomelli,Paolo Giacomelli, D. Glenzinski, J. Goldberg,K. Graham, Eugene P. Gross, J. Grunhaus, M. Gruwe, P. O. Günther, A. Gupta,Csaba Hajdu,M. Hamann, G. G. Hanson,Kristian Harder, Amnon Harel, M. Harin-Dirac,M. Hauschild,J. Hauschildt,C. M. Hawkes, R. J. Hawkings, R. J. Hemingway, Carsten Hensel, Gregor Herten, R. D. Heuer, J. C. Hill, Kara Hoffman,R. J. Homer

Physics Letters B（2001）

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摘要

The inclusive branching ratio for the process b --> tau (-)(v) over bar X-tau has been measured using hadronic Z decays collected by the OPAL experiment at LEP in the years 1992-2000. The result is: BR(b --> tau (-)(v) over bar X-tau) = (2.78 +/- 0.18 +/- 0.51)%. This measurement is consistent with the Standard Model expectation and puts a constraint of tan beta /M-H(+/-) < 0.53 GeV-1 at the 95% confidence level on Type II Two Higgs Doublet Models. (C) 2001 Elsevier Science B.V. All rights reserved.

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detector,fragmentation

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