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.

Lees, J., Poireau, V., Tisserand, V., Grauges, E., Palano, A., Eigen, G., et al. (2013). Measurement of an excess of (B)over-bar -> D-(*) tau(-)(v)over-bar(tau) decays and implications for charged Higgs bosons. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 88(7) [10.1103/PhysRevD.88.072012].

Measurement of an excess of (B)over-bar -> D-(*) tau(-)(v)over-bar(tau) decays and implications for charged Higgs bosons

Martinelli M.;CARPINELLI, Massimo;
2013

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.
Articolo in rivista - Articolo scientifico
Higgs boson;
English
2013
88
7
072012
none
Lees, J., Poireau, V., Tisserand, V., Grauges, E., Palano, A., Eigen, G., et al. (2013). Measurement of an excess of (B)over-bar -> D-(*) tau(-)(v)over-bar(tau) decays and implications for charged Higgs bosons. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 88(7) [10.1103/PhysRevD.88.072012].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/389225
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