Search for di-muon decays of a low-mass Higgs boson in radiative decays of the \Upsilon(1S)

TL;DR

This study searches for low-mass Higgs boson decays into di-muons in radiative  extsubscript{1S} decays but finds no evidence, setting upper limits on the branching fractions and coupling parameters.

Contribution

First search for di-muon decays of a low-mass Higgs in  extsubscript{1S} radiative decays using BaBar data, establishing new upper limits.

Findings

No evidence for A^0 production was observed.

Set upper limits on the product branching fraction in the range of (0.28 - 9.7) imes 10^{-6}.

Constraints on the effective coupling of the b-quark to A^0 were derived.

Abstract

We search for di-muon decays of a low-mass Higgs boson (A^0) produced in radiative \Upsilon(1S) decays. The \Upsilon(1S) sample is selected by tagging the pion pair in the \Upsilon(2S, 3S) \to \pi^+ \pi^- \Upsilon(1S) transitions, using a data sample of 92.8 \times 10^6 \Upsilon(2S) and 116.8 \times 10^6 \Upsilon(3S) events collected by the \babar\ detector. We find no evidence for A^0 production and set 90% confidence level upper limits on the product branching fraction \mathcal{B} (\Upsilon(1S) \to \gamma A^0) \times \mathcal{B} (A^0 \to \mumu) in the range of (0.28 - 9.7) \times 10^{-6} for 0.212 \le m_{A^0} \le 9.20 GeV/c^2. The results are combined with our previous measurements of \Upsilon(2S,3S) \to \gamma A^0, A^0 \to \mumu to set limits on the effective coupling of the \b-quark to the A^0.