Abstract
In this paper, we briefly review the LHC discovery potential of a light pseudoscalar Higgs boson of the NMSSM, a1, produced in the gluon fusion gg→a1, bottom-quark fusion bb¯→a1 and bottom-gluon fusion bg→ba1. We also review the LHC discovery potential of the next-to-lightest CP-even Higgs boson h2 being the non-SM-like Higgs, decaying either into two light CP-odd Higgs bosons a1 or into a light a1 and the Z gauge boson through the gluon fusion gg→h2 in the 4τ final state. We find that the light a1 can be detected at the LHC in a variety of production processes including the gluon fusion, bottom-quark fusion and bottom-gluon fusion. The latter two processes require high luminosity of the LHC and large values of tanβ. We also find that the LHC has the potential to discover the non-SM-like Higgs state, h2, decaying into a pair of light CP-odd Higgses a1’s, allowing the distinguishing of the NMSSM Higgs sector from the MSSM one as such a light a1, is impossible in the latter scenario.
Highlights
The observation of the neutral Higgs boson with a mass around 125 GeV by the ATLAS and CMS collaborations at CERN [1,2,3,4] in 2012 strongly supports the idea of supersymmetric models
We show that the process gg → h2 → a1 a1 is an alternative option to produce the light pseudoscalar Higgs boson, in which case our random scan reveals that the non-SM-like Higgs boson h2 mainly decays into a pair of a1 ’s with a branching ratio & 0.5 as long as it is kinematically allowed
The light Next-to-Minimal Supersymmetric Standard Model (NMSSM) pseudoscalar Higgs boson could be produced at the LHC via gluon fusion gg → a1, which is mediated by heavy quark and squark loops
Summary
The observation of the neutral Higgs boson with a mass around 125 GeV by the ATLAS and CMS collaborations at CERN [1,2,3,4] in 2012 strongly supports the idea of supersymmetric models. The interesting phenomenological aspects of the NMSSM in comparison to the MSSM is that a light pseudoscalar Higgs boson a1 is possible at the NMSSM The discovery of such a light Higgs state with a mass less than the Z boson mass at the LHC or other colliders would unmistakably indicate the existence of a non-minimal SUSY Higgs sector. The cross sections of Higgs boson production in association with bottom-quark pair at the LHC can be calculated using two schemes, called four-flavor scheme and five-flavor scheme In the former scheme where the bottom quarks only appear in the final states, they are not treated as partons in the protons but as massive particles.
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