Abstract
Abstract We study a region in the NMSSM parameter space in which the mass of the SM-like Higgs boson is uplifted by ∼ 4 − 17 GeV, allowing for stop masses and |A t | ≤ 1 TeV alleviating the little fine tuning problem of the MSSM. An uplift of the mass of the SM-like Higgs boson is possible in two distinct regions in the NMSSM parameter space: either for large λ and small tan β or, through singlet-doublet mixing, for small λ and large tan β. For a mostly singlet-like Higgs state H S with a mass below 125 GeV we investigate possible direct or indirect search channels at the run II of the LHC as function of the NMSSM-specific uplift of the mass of the SM-like Higgs boson: direct production of H S in gluon fusion with H S decaying into diphotons, modified reduced couplings of the SM-like Higgs state, and the possible production of H S in ggF → A → Z +H S . We find that the region featuring singlet-doublet mixing can be tested if searches at the LHC at 13 TeV for BSM Higgs bosons in the mass range 88 − 102 GeV decaying into diphotons become sensitive to signal cross sections σ(gg → H S → γγ) ∼ 20fb, or if measurements of the reduced coupling κ V (H SM ) of the SM Higgs boson to electroweak gauge boson exclude (or confirm) the region κ V (H SM ) ≲ 0.93.
Highlights
JHEP02(2016)096 of the Standard Model (SM) with the MSSM: the hierarchy problem can be strongly reduced, the presence of dark matter can be explained, and the running gauge couplings are automatically consistent with a Grand Unified Theory (GUT)
We study a region in the NMSSM parameter space in which the mass of the SM-like Higgs boson is uplifted by ∼ 4 − 17 GeV, allowing for stop masses and |At| ≤ 1 TeV alleviating the little fine tuning problem of the MSSM
For a mostly singlet-like Higgs state HS with a mass below 125 GeV we investigate possible direct or indirect search channels at the run II of the LHC as function of the NMSSM-specific uplift of the mass of the SM-like Higgs boson: direct production of HS in gluon fusion with HS decaying into diphotons, modified reduced couplings of the SM-like Higgs state, and the possible production of HS in ggF → A → Z +HS
Summary
JHEP02(2016) of the Standard Model (SM) with the MSSM: the hierarchy problem can be strongly reduced, the presence of dark matter can be explained, and the running gauge couplings are automatically consistent with a Grand Unified Theory (GUT). B) If the mostly singlet-like state HS has a mass below 125 GeV, mixing between HS and HSM (more precisely, among the weak eigenstates) leads to an increase of the mass of the latter The impact of such mixings on the Higgs spectrum of the NMSSM has been known for a while [23, 24, 32,33,34,35], but became interesting once the mass of ∼ 125 GeV of the mostly SM-like state had been measured [4, 26, 36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58]. We found that a sizeable positive mass shift for the SM-like state is unlikely here
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