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We study a ${U(1)}_R$ symmetric extenstion of supersymmetric standard modelwith supersymmetry breaking in the visible as well as hidden sectors.Specifically we study ${U(1)}_R$ breaking effects parametrized by the gravitinomass. A special $R$-charge assignment of right-handed neutrinos allows us tohave neutrino Yukawa couplings with the $R$-charged Higgs field, which developsa tiny vacuum expectation value after the inclusion of $U(1)_R$ symmetrybreaking. Even with O(1) Yukawa couplings, a suitable size of Dirac neutrinomasses can be generated if the gravitino mass is very small,$m_{3/2}=1\hbox{---}10\,\mathrm{eV}$. Our flipped $R$-charge assignment alsoallows a new type of dimension five operator that can induce the proton decay.It turns out that the proton stability mildly constrains the allowed range ofthe gravitino mass: Gravitino heavier than $10 \ \mathrm{keV}$ can evade theproton decay constraint as well as cosmological ones. In this case, the largestneutrino Yukawa coupling is comparable to the electron Yukawa. We alsocalculate the mass of the pseudo goldsino and its mixing to neutralinos, andbriefly discuss its implications in cosmology and Higgs phenomenology.

Neutrino Mass and Proton Decay in a ${U(1)}_R$ Symmetric Model