Search for a low-mass Higgs boson ($A^0$) at BABAR

Abstract

The BABAR Collaboration has performed three searches for a light Higgs boson, $A^0$, in radiative Upsilon ($Υ$) decays: $Υ(3S)\toγA^0$, $A^0\toτ^+τ^-$; $Υ(nS)\toγA^0$, $A^0\toμ^+μ^-$ ($n=2,3$); and $Υ(3S)\toγA^0$, $A^0\to$ invisible. Such a Higgs boson ($A^0$) appears in the Next-to-Minimal Supersymmetric extensions of the Standard Model, where a light CP-odd Higgs boson couples strongly to $b$-quarks. The searches are based on data samples that consist of $122\times 10^6$ $Υ(3S)$ and $99\times 10^6$ $Υ(2S)$ decays, collected by the BABAR detector at the SLAC National Accelerator Laboratory. The searches reveal no evidence for an $A^0$, and product of branching fractions upper limits, at 90% C.L., of $(1.5-16)\times 10^{-5}$, $(0.44-44)\times 10^{-6}$, and $(0.7-31)\times 10^{-6}$ were obtained for these searches, respectively. Also, we set the upper limits ${\mathcal {B}}(η_b\toτ^+τ^-)<8%$ and ${\mathcal {B}}(η_b\toμ^+μ^-)<0.9%$.