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Evidence for an excess of (B)over-bar -> D-(*()) tau(-)(nu)over-bar(tau) decays

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Lees, J., Poireau, V., Tisserand, V., Garra Tico, J., Grauges, E., Palano, A., Eigen, G., Stugu, B., Brown, D., Kerth, L. et al.
. (2012) Evidence for an excess of (B)over-bar -> D-(*()) tau(-)(nu)over-bar(tau) decays. Physical Review Letters, Vol.109 (No.10). Article no. 101802. ISSN 0031-9007

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Abstract

Based on the full BABAR data sample, we report improved measurements of the ratios R(D-(*())) = B((B) over bar -> D-(*()) tau(-)(nu) over bar (tau))/B((B) over bar -> D-(*()) l(l)(-)(nu) over bar (l), where l is either e or mu. 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 2.0 sigma and 2.7 sigma, respectively. Taken together, our results disagree with these expectations at the 3.4 sigma level. This excess cannot be explained by a charged Higgs boson in the type II two-Higgs-doublet model.

Item Type: Journal Article
Divisions: Faculty of Science > Physics
Journal or Publication Title: Physical Review Letters
Publisher: American Physical Society
ISSN: 0031-9007
Date: 2012
Volume: Vol.109
Number: No.10
Page Range: Article no. 101802
Identification Number: 10.1103/PhysRevLett.109.101802
Status: Peer Reviewed
Publication Status: Published
URI: http://wrap.warwick.ac.uk/id/eprint/50812

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