Perturbativity and mass scales in the minimal left-right symmetric model

Abstract

The scalar sector of the minimal left-right model at TeV scale is revisited in light of the large quartic coupling needed for a heavy flavor-changing scalar. The stability and perturbativity of the effective potential is discussed and merged with constraints from low-energy processes. Thus, the perturbative level of the left-right scale is sharpened. Lower limits on the triplet scalars are also derived: The left-handed triplet is bounded by oblique parameters, while the doubly charged right-handed component is limited by the $h\ensuremath{\rightarrow}\ensuremath{\gamma}\ensuremath{\gamma}$, $Z\ensuremath{\gamma}$ decays. Current constraints disfavor their detection as long as ${W}_{R}$ is within the reach of the LHC.