Fermionic decays of NMSSM Higgs bosons under LHC 13 TeV constraints

Abstract

This paper investigates the impact of the recent LHC constraints on the Higgs sector in the semi-constrained version of the Next-to-Minimal Supersymmetric Standard Model. Our analysis focuses on the parameter space for which the value of the Higgs doublet-singlet coupling, $\lambda$, is large as possible, while the ratio between the vacuum expectation values of the two Higgs doublets, $\tan \beta$, is small as possible. Under the current constraints, we present the possible fermionic decay channels and reduced cross-section into fermions final states for the lightest neutral Higgs bosons in the NMSSM, $(h_1$, $h_2$, and $a_1)$. We found that the branching ratios of the non SM-like Higgs ($a_1$ and $h_2$) into a pair of bottom quarks are near 90\% level when the Higgs mass below 400 GeV. Moreover, the branching ratio of $h_2/a_1\to t\bar{t}$ can reach unity for all mass ranges when these bosons are mostly singlet.

7 pages, 5 figures

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