Author(s): Thede de Boer, Manfred Lindner, and Andreas Trautner 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. T… [Phys. Rev. Lett. 137, 031801] Published Tue Jul 14, 2026