Measurement of an Excess of $\bar{B} \to D^{(*)}\tau^- \bar{\nu}_\tau$ Decays and Implications for Charged Higgs Bosons - INSPIRE

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Measurement of an Excess of $\bar{B} \to D^{(*)}\tau^- \bar{\nu}_\tau$ Decays and Implications for Charged Higgs Bosons

BaBar

Collaboration

Mar 3, 2013

30 pages

Published in:

Phys.Rev.D 88 (2013) 7, 072012

Published: Oct 31, 2013

e-Print:

1303.0571 [hep-ex]

DOI:

10.1103/PhysRevD.88.072012

Report number:

BABAR-PUB-13-001,
SLAC-PUB-15381

Experiments:

SLAC-PEP2-BABAR

View in:

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Abstract: (APS)

Based on the full BABAR data sample, we report improved measurements of the ratios R(D)=B(B¯→Dτ-ν¯τ)/B(B¯→Dℓ-ν¯ℓ) and R(D*)=B(B¯→D*τ-ν¯τ)/B(B¯→D*ℓ-ν¯ℓ), where ℓ refers to either an electron or muon. 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, the 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. Kinematic distributions presented here exclude large portions of the more general type III two-Higgs-doublet model, but there are solutions within this model compatible with the results.

Note:

32 pages, 30 postscript figures, submitted to Phys. Rev. D

13.20.He
14.40.Nd
14.80.Da
Higgs particle: charged particle
new physics
BaBar
electron positron: annihilation
B: pair production
anti-B: semileptonic decay
anti-B0: branching ratio

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Figures(28)

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