Evidence for an excess of BâD*τ(-)ν(τ) decays.
Phys Rev Lett
; 109(10): 101802, 2012 Sep 07.
Article
em En
| MEDLINE
| ID: mdl-23005279
ABSTRACT
Based on the full BABAR data sample, we report improved measurements of the ratios R(D(*))=B(B[over ¯]âD(*)τ(-)ν[over ¯](τ))/B(B[over ¯]âD(*)â(â)(-)ν[over ¯](â)), where â is either e or µ. 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, our 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.
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Base de dados:
MEDLINE
Idioma:
En
Ano de publicação:
2012
Tipo de documento:
Article