EPJ Web of Conferences 49, 15002 (2013)
https://doi.org/10.1051/epjconf/20134915002

Search For New Physics at BABAR^*

Department of Physics University of South Alabama ILB 115, 307 University Blvd., N.

^a e-mail: godang@usouthal.edu

Abstract

Using a full BABAR data sample of 426 fb⁻¹, we present improved measurements of the ratio ℛ(D^(∗)) = ℬ(B̅ → D^(∗)τ⁻ν̅_τ)/ ℬ(B̅ → D^(∗)ℓ_ℓ⁻ν̅_ℓ), where ℓ is either electron or muon. We measure ℛ(D) = 0.440±0.058±0.042 and ℛ(D∗) = 0.332±0.024±0.018. These ratios exceed the Standard Model predictions by 2:0σ and 2:7σ, respectively. The results disagree with the Standard Model predictions at the level of 3:4σ. The ratios are sensitive to new physics contributions in the form of a charged Higgs boson. However, the access cannot be explained by a charged Higgs boson in the type II two-Higgs-doublet model.