Natural emergence of neutrino masses and dark matter from $R$-symmetry

Understand

We propose a supersymmetric extension of the Standard Model (SM) with a continuous global $U(1)_R$ symmetry.

• The $R$-charges of the SM fields are identified with that of their lepton numbers.
• As a result, both bilinear and trilinear `$R$-parity violating' (RPV) terms could be present at the superpotential.
• However, $R$-symmetry is not an exact symmetry as it is broken by supergravity effects.