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Linking a 152 GeV diphoton excess to dark matter and gravitational waves in the singlet-extended 2HDM
We investigate the diphoton excesses near $152~\mathrm{GeV}$ accompanied by missing transverse momentum (MET) in the Type-I two-Higgs-doublet model extended by a complex scalar singlet, whose imaginary component serves as a pseudo-Nambu-Goldstone dark matter (DM) candidate $χ$. The signal arises fro
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