Hidden Sector Custodial Naturalness

Le résumé fourni par la source

Custodial naturalness is a recently introduced idea that combines conformal and scalar sector custodial symmetry to address the electroweak (EW) scale hierarchy problem of the standard model (SM). We introduce a new model that realizes custodial naturalness without extension of the SM gauge group. The number of new dynamical degrees of freedom is minimized, and the custodial symmetry is reduced to SO(5). This requires a new scalar singlet field that automatically is a good dark matter (DM) candidate, produced via freeze-in with moderate couplings. The most minimal scenario allows the quantum critical generation of the EW scale in a phenomenologically viable way requiring a UV completion at around 10^{11} GeV. Including ingredients for neutrino mass generation can push this scale to M_{Pl}.

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