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Abstract |
We propose a novel scale-invariant model with the 3-3-1-1 gauge symmetry featuring a universal seesaw mechanism for all fermion masses, which, through the inclusion of additional vectorlike quarks, provides a partial explanation for the observed fermion mass hierarchies. A discrete remnant of the gauge group, the matter parity (P-M), stabilizes a fermionic dark matter candidate, and the scalar sector includes two triplets (minimal for 3-3-1 breaking) and two scalar singlets. We identify the lightest P-M-odd fermion, f(d), as a viable dark matter candidate. Our analysis shows that f(d) satisfies the observed relic density constraint within the mass range 220 GeV less than or similar to mf(d) less than or similar to 555 GeV, primarily due to resonant annihilation via the new scalar H-2. While this mass range depends on the symmetry-breaking scale v(chi), which has a lower bound of v(chi) greater than or similar to 3.6 TeV from LEP constraints on the rho(0) parameter, we adopt a more conservative lower bound of v(chi) >10 TeV. This choice is made to ensure that the Z ' boson mass remains above approximately 4 TeV, and is motivated by recent LHC results and future projections for Z ' boson searches, which provide more stringent constraints than previous bounds or those from the rho(0) parameter. Spin-independent (SI) interactions dominate the direct detection phenomenology of f(d). We calculate the SI elastic scattering cross section and find that parameter points satisfying the relic density constraint are consistent with current experimental limits from LZ and PandaX-4T for certain parameter choices, particularly depending on the alpha(12) angle. Some regions of the viable parameter space lie below the neutrino floor. Prospects for detection by future experiments like XLZD and PandaX-xT are also presented and discussed. |
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Address |
[Dias, Alex G.; Padovani, Vinicius] Univ Fed ABC, Ctr Ciencias Nat Humanas, BR-09210580 Santo Andre, SP, Brazil, Email: vinicius.padovani.physics@gmail.com; |
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