# Detection prospects of light pseudoscalar Higgs boson at the LHC

## TL;DR

This paper investigates the detection prospects of a light pseudoscalar Higgs boson within the NMSSM at the LHC, focusing on photon-rich final states and considering existing experimental constraints.

## Contribution

It analyzes the potential to discover a light pseudoscalar Higgs boson in the 10-60 GeV range through multi-photon signatures, incorporating ATLAS data constraints.

## Key findings

- Detection prospects are promising with 100 fb^{-1} luminosity.
- Significance can exceed 5σ at higher luminosities.
- Branching ratios to photon pairs can be substantial in the NMSSM.

## Abstract

The discovery potential of light pseudo scalar Higgs boson for the mass range 10-60 GeV is explored. In the context of the next-to-minimal supersymmetric standard(NMSSM) model, the branching fraction of light pseudo scalar Higgs boson decaying to a pair of photon can be quite large. A pair of light pseudo scalar Higgs boson produced indirectly through the standard model Higgs boson decay yields multiple photons in the final state and the corresponding production rate is restricted by ATLAS data. Discussing the impact of this constraint in the NMSSM, the detection prospects of light pseudoscalar Higgs boson in the channel consisting of at least three photons, a lepton and missing transverse energy are reported. It is observed that the possibilities of finding the pseudoscalar Higgs boson for the above mass range are promising for an integrated luminosity $\mathcal{L}=100 \text{fb}^{-1}$ with moderate significances, which can reach to more than 5$\sigma$ for higher luminosity options.