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Measurements of BR (b ---> tau- anti-nu(tau) X) and BR (b ---> tau- anti-nu(tau) D*+- X) and upper limits on BR (B- ---> tau- anti-nu(tau)) and BR (b---> s nu anti-nu)

ALEPH Collaboration, The and Barate, R. and Bowdery, Christopher and Finch, Alexander and Foster, Frank and Hughes, Gareth and Jones, Roger (2001) Measurements of BR (b ---> tau- anti-nu(tau) X) and BR (b ---> tau- anti-nu(tau) D*+- X) and upper limits on BR (B- ---> tau- anti-nu(tau)) and BR (b---> s nu anti-nu). European Physical Journal C: Particles and Fields, 19 (2). pp. 213-227. ISSN 1434-6044

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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−ν¯τ X) and the semi-inclusive branching ratio BR(b →τ−ν¯τD∗± 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−ν¯τ) and BR(b →sνν¯) 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 tanβ/mH± ratio, in the framework of type-II two-Higgs-doublet models.

Item Type: Article
Journal or Publication Title: European Physical Journal C: Particles and Fields
Subjects:
Departments: Faculty of Science and Technology > Physics
ID Code: 63935
Deposited By: ep_importer_pure
Deposited On: 07 May 2013 11:34
Refereed?: Yes
Published?: Published
Last Modified: 20 Oct 2017 00:03
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/63935

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