Journal
PHYSICS LETTERS B
Volume 520, Issue 1-2, Pages 1-10Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0370-2693(01)01012-7
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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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