Searching for a heavy neutral CP-even Higgs boson in the BLSSM at the LHC Run 3 and HL-LHC

The detection of a heavy neutral CP-even Higgs boson of the $$B-L$$ B - L Supersymmetric Standard Model (BLSSM), $$h'$$ h ′ , with mh' 400~GeV m h ′ ≃ 400 GeV , at the Large Hadron Collider (LHC) for a center-of-mass energy of √s=14~TeV s = 14 TeV , is investigated. The following production and decay channels are considered: gg→ h'→ ZZ→ 4 g g → h ′ → ZZ → 4 ℓ and "Equation missing" (with "Equation missing" being the Missing Transverse Energy (MET)), where =e,μ ℓ = e , μ , with integrated luminosity Lᵢₙₜ=300~fb⁻¹ L int = 300 fb - 1 (Run 3). Furthermore, we also look into the di-Higgs channel gg→ h'→ hh→ bb̄γ γ g g → h ′ → hh → b b ¯ γ γ at the High-Luminosity LHC (HL-LHC) with an integrated luminosity of Lᵢₙₜ=3000~fb⁻¹ L int = 3000 fb - 1 . We demonstrate that promising signals with high signal-to-background statistical significance ( S/√B S / B ) can be obtained through the three aforementioned channels.