Evidence for an Excess of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mover accent="true"><mml:mi>B</mml:mi><mml:mo>¯</mml:mo></mml:mover><mml:mo>→</mml:mo><mml:msup><mml:mi>D</mml:mi><mml:mrow><mml:mo stretchy="false">(</mml:mo><mml:mo>*</mml:mo><mml:mo stretchy="false">)</mml:mo></mml:mrow></mml:msup><mml:msup><mml:mi>τ</mml:mi><mml:mo>−</mml:mo></mml:msup><mml:msub><mml:mover accent="true"><mml:mi>ν</mml:mi><mml:mo>¯</mml:mo></mml:mover><mml:mi>τ</mml:mi></mml:msub></mml:math>Decays

2012/05/24 by The BaBar Collaboration, J. P. Lees, V. Poireau +98 · 1 voice · 29 citations
Physics and Astronomy · #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #Dark Matter and Cosmic Phenomena

paper · pdf · doi:10.1103/physrevlett.109.101802

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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