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Measurement of the branching ratio for the process b → τ −ν¯τX

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  • OPAL Collaboration
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<mark>Journal publication date</mark>8/11/2001
<mark>Journal</mark>Physics Letters B
Issue number1-2
Volume520
Number of pages10
Pages (from-to)1-10
Publication StatusPublished
<mark>Original language</mark>English

Abstract

The inclusive branching ratio for the process b → τ−ν¯τ X has been measured using hadronic Z decays collected by the OPAL experiment at LEP in the years 1992–2000. The result is: BR(b → τ−ν¯τ X) = (2.78 ± 0.18 ± 0.51)%. This measurement is consistent with the Standard Model expectation and puts a constraint of tan β/M± H < 0.53 GeV−1 at the 95% confidence level on Type II Two Higgs Doublet Models.