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Vector dark matter and LHC constraints, including a 95 GeV light Higgs boson
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abstract
We study LHC searches for an extension of the Standard Model (SM) by exploiting an additional Abelian $U_D(1)$ gauge symmetry and a complex scalar Higgs portal. As the scalar is charged under this gauge symmetry, a vector dark matter (VDM) candidate can satisfy the observed relic abundance and limits from direct dark matter (DM) searches. The ATLAS and CMS experiments have developed a broad search program for the DM candidates, including associate production of Higgs boson, $Z$ boson, and top quark that couple to DM. In this paper, we perform an extensive analysis to constrain the model by using these experiments at LHC. It can be seen that the LHC results can exclude some parts of the parameter space that are still allowed by relic density and the direct detection searches. Using the LHC results, all scalar Higgs portal masses are excluded for the light VDM. Furthermore, exclusion limits on the parameter space of the model by using the new results of the CMS and ATLAS Collaborations for a new light Higgs boson with mass $\sim95~\rm GeV$ are provided.
Forward citations
Cited by 7 Pith papers
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Interpreting Light Scalar Excesses and Heavy Scalar Cascades in the $\mu$-Term Extended NMSSM
Viable μNMSSM regions can fit the 95 GeV diphoton/bb anomalies and produce H→hhs and A2→hA1→4b cascades near the 650 and (600,400) GeV CMS structures.
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Light Scalars in the Extended Georgi-Machacek Model
A global fit of the Georgi-Machacek and extended Georgi-Machacek models finds that the 95 GeV diphoton and bottom-quark excesses are compatible with the 125 GeV Higgs data, while the ditau excess is not, and it sets u...
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On the CP Nature of the `95 GeV' Anomalies
A projection study showing that HL-LHC tau-pair data could determine the CP mixing angle of a hypothetical 95 GeV resonance to within roughly 0.27 to 0.47 radians at 90% confidence.
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Interplay of $95$ GeV Diphoton Excess and Dark Matter in Supersymmetric Triplet Model
A parameter scan shows the triplet-extended MSSM has regions that fit the 95 GeV diphoton signal, the 125 GeV Higgs mass, and the dark matter relic density simultaneously.
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Interpretation of 95 GeV Excess within the Georgi-Machacek Model in Light of Positive Definiteness Constraints
The Georgi-Machacek model keeps viable parameter space for the 95 GeV diphoton and bbbar excesses under positive definiteness constraints, which the paper finds expand the allowed region relative to tree-level bounded...
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96 GeV Scalar Boson in the 2HDM with U(1)_H Gauge Symmetry
Type-II and Type-Y two-Higgs-doublet models with a gauged U(1)_H symmetry can accommodate the 96 GeV diphoton, ditau, and bbbar excesses within 2 sigma, with the light scalar mostly a new singlet.
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Exploring Potential Higgs Resonances at 650 GeV and 95 GeV in the 2HDM Type III
In a 2HDM Type III, a 650 GeV CP-odd Higgs decaying via H(125)Z with H->γγ and Z->bb, plus a 95 GeV light Higgs, can accommodate both the CMS 650 GeV and the 95 GeV diphoton excesses at about 2.5 sigma.
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