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Measurements of BR(b $\to \tau^- \bar{\nu}_{\tau}$ X) and BR(b $\to \tau^- \bar{\nu}_{\tau}{\mathrm D}^{\ast\pm}$ X) and upper limits on BR(B $^- \to \tau^- \bar{\nu}_{\tau})$ and BR(b $\to{\mathrm s} \nu \bar{\nu})

Inclusive branching ratios involving b to tau transitions are measured in approximately four million hadronic Z decays collected by the ALEPH detector at LEP. The fully-inclusive branching ratio b -> tau nu X and the semi-inclusive branching ratio b -> tau nu D*+/- X are measured to be (2.43 +...

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Bibliographic Details
Published in:The European physical journal. C, Particles and fields Particles and fields, 2001, Vol.19 (2), p.213-227
Main Author: Barate et al, R.
Format: Article
Language:English
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Summary:Inclusive branching ratios involving b to tau transitions are measured in approximately four million hadronic Z decays collected by the ALEPH detector at LEP. The fully-inclusive branching ratio b -> tau nu X and the semi-inclusive branching ratio b -> tau nu D*+/- 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 b -> tau nu and b -> s nu nubar 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/c**2)**-1 to be set on the tan(beta)/mH+/- ratio, in the framework of type-II two-Higgs-doublet models.
ISSN:1434-6044
1434-6052
DOI:10.1007/s100520100612