Based on the full BABAR data sample, we report improved measurements of the ratios ℛ(D(*))=ℬ(B⎯⎯⎯→D(*)τ−ν⎯⎯τ)/ℬ(B⎯⎯⎯→D(*)ℓ−ℓν⎯⎯ℓ), where ℓ 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.

Lees, J.P., Poireau, V., Tisserand, V., Garra Tico, J., Grauges, E., Palano, A., et al. (2012). Evidence for an Excess of (B)over-bar -> D-(*()) tau(-)(nu)over-bar(tau) Decays. PHYSICAL REVIEW LETTERS, 109(10), 1-8 [10.1103/PhysRevLett.109.101802].

Evidence for an Excess of (B)over-bar -> D-(*()) tau(-)(nu)over-bar(tau) Decays

PATRIGNANI, CLAUDIA;
2012

Abstract

Based on the full BABAR data sample, we report improved measurements of the ratios ℛ(D(*))=ℬ(B⎯⎯⎯→D(*)τ−ν⎯⎯τ)/ℬ(B⎯⎯⎯→D(*)ℓ−ℓν⎯⎯ℓ), where ℓ 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.
2012
Lees, J.P., Poireau, V., Tisserand, V., Garra Tico, J., Grauges, E., Palano, A., et al. (2012). Evidence for an Excess of (B)over-bar -> D-(*()) tau(-)(nu)over-bar(tau) Decays. PHYSICAL REVIEW LETTERS, 109(10), 1-8 [10.1103/PhysRevLett.109.101802].
Lees, J. P.; Poireau, V.; Tisserand, V.; Garra Tico, J.; Grauges, E.; Palano, A.; Eigen, G.; Stugu, B.; Brown, D. N.; Kerth, L. T.; Kolomensky, Yu. G....espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/537370
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