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 $h\to \gamma \gamma$, $Z\gamma$ decays. Current constraints disfavor their detection as long as $W_R$ is within the reach of the LHC.

• Received 16 March 2016

DOI:https://doi.org/10.1103/PhysRevD.94.035008