BaBar Collaboration (Including: Gershon, T. J., Harrison, P. F. and Latham, Thomas). (2013) Measurement of an excess of B̄→D(*) τ-ν̄τ decays and charged Higgs bosons. Physical Review D (Particles, Fields, Gravitation and Cosmology), Volume 88 (Number 7). Article number 072012. doi:doi: 10.5606/tgkdc.dergisi.2013.6683 ISSN 1550-7998.

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Abstract

Based on the full BABAR data sample, we report improved measurements of the ratios R(D)=B(B̄→Dτ-ν̄τ)/ B(B̄→Dℓ-ν̄ℓ) and R(D*)=B(B̄→D*τ-ν̄τ)/ B(B̄→D*ℓ-ν̄ℓ), where ℓ refers to either an electron or muon. These ratios are sensitive to new physics contributions in the form of a charged Higgs boson. We measure R(D)=0.440±0.058±0.042 and R(D*)=0.332±0. 024±0.018, which exceed the standard model expectations by 2.0σ and 2.7σ, respectively. Taken together, the results disagree with these expectations at the 3.4σ level. This excess cannot be explained by a charged Higgs boson in the type II two-Higgs-doublet model. Kinematic distributions presented here exclude large portions of the more general type III two-Higgs-doublet model, but there are solutions within this model compatible with the results.

Item Type:	Journal Article
Divisions:	Faculty of Science, Engineering and Medicine > Science > Physics
Journal or Publication Title:	Physical Review D (Particles, Fields, Gravitation and Cosmology)
Publisher:	American Physical Society
ISSN:	1550-7998
Official Date:	31 October 2013
Dates:	Date Event 31 October 2013 Published 5 March 2013 Submitted
Volume:	Volume 88
Number:	Number 7
Article Number:	Article number 072012
DOI:	doi: 10.5606/tgkdc.dergisi.2013.6683
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access

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