Low mass New Physics search for a CP-odd Higgs boson $A^0$ deacying to $s\bar s$ or gluon gluon at BaBar

TL;DR

This paper searches for a light pseudoscalar Higgs boson decaying into gluons or strange quark pairs in Upsilon decays, using BaBar data, and sets upper limits due to no observed signal.

Contribution

First search for a CP-odd Higgs boson decaying into gluons or strange quark pairs in Upsilon decays using BaBar data, establishing new upper limits.

Findings

No significant signal observed.

Upper limits set on the product branching fraction.

Constraints on light Higgs boson models.

Abstract

We report on the search for the decay $\Upsilon(1S) \to \gamma A^0$, $A^0 \to gg$ or $s\bar s$, where $A^0$ is the pseudoscalar light Higgs boson predicted by the next-to-minimal supersymmetric standard model. A sample of $\sim 18 \times 10^6$ $\Upsilon(1S)$ resonances, produced in the BaBar experiment via $e^+e^- \to \Upsilon(2S) \to \pi^+\pi^-\Upsilon(1S)$, is used for this search. No significant signal has been found, and upper limits at the $90\%$ of confidence level are set on the product branching fraction of the process.