Evidence for an Excess ofB¯→D(*)τ−ν¯τDecays

2012/05/24 by The BaBar Collaboration, J. P. Lees, V. Poireau +98 · 1 voice · 869 citations
Physics and Astronomy · #Dark Matter and Cosmic Phenomena #Higgs boson #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #Type (biology) #hep-ex

paper · pdf · doi:10.1103/physrevlett.109.101802

published in Physical Review Letters 109(10), 101802 (American Physical Society) · Expanded section on systematics, text corrections, improved the format of Figure 2 and included the effect of the change of the Tau polarization due to the charged Higgs

openalex publication_date 2012/09/06 · arxiv created 2012/09/20 · arxiv updated 2015/03/19 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

Based on the full BABAR data sample, we report improved measurements of the ratios R(D^(*))=B(B\ensuremath→D^(*)\ensuremathτ^\ensuremath-\ensuremathν_\ensuremathτ)/B(B\ensuremath→D^(*)\ensuremathℓ_\ensuremathℓ^\ensuremath-\ensuremathν_\ensuremathℓ), where \ensuremathℓ is either e or \ensuremathμ. These ratios are sensitive to new physics contributions in the form of a charged Higgs boson. We measure R(D)=0.440\ifmmode±\else\textpm\fi0.058\ifmmode±\else\textpm\fi0.042 and R(D^*)=0.332\ifmmode±\else\textpm\fi0.024\ifmmode±\else\textpm\fi0.018, which exceed the standard model expectations by 2.0\ensuremathσ and 2.7\ensuremathσ, respectively. Taken together, our results disagree with these expectations at the 3.4\ensuremathσ level. This excess cannot be explained by a charged Higgs boson in the type II two-Higgs-doublet model.

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