Based on the full BABAR data sample, we report improved measurements of the ratios ℛ(D)=ℬ(Bbar→Dτ−νbar_τ)/ℬ(Bbar→Dℓ−νbar_ℓ) and ℛ(D∗)=ℬ(Bbar→D∗τ−νbar_τ)/ℬ(Bbar→D∗ℓ−νbar_ℓ), 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.

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

CONTRI, ROBERTO;GUIDO, ELISA;LO VETERE, MAURIZIO;MONGE, MARIA ROBERTA;
2013-01-01

Abstract

Based on the full BABAR data sample, we report improved measurements of the ratios ℛ(D)=ℬ(Bbar→Dτ−νbar_τ)/ℬ(Bbar→Dℓ−νbar_ℓ) and ℛ(D∗)=ℬ(Bbar→D∗τ−νbar_τ)/ℬ(Bbar→D∗ℓ−νbar_ℓ), 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.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11567/696070
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