New Messenger Sector for Gauge Mediated Supersymmetry Breaking

Abstract

We propose a new class of gauge mediated supersymmetry breaking models where the standard model gauge group is embedded into the gauge group $\mathrm{SU}(2{)}_L\times \mathrm{U}(1{)}_{I_{3R}}\times \mathrm{U}(1{)}_{B-L}$ [or $\mathrm{SU}(2{)}_L\times \mathrm{SU}(2{)}_R\times \mathrm{U}(1{)}_{B-L}$] at the supersymmetry breaking scale ${\Lambda }_S$. The messenger sector in these models can consist of color singlet but $\mathrm{U}(1{)}_{I_{3R}}$ and $\mathrm{U}(1{)}_{B-L}$ nonsinglet fields. The distinguishing features of such models are (i) exact $R$-parity conservation, (ii) nonvanishing neutrino masses, and (iii) a unified hidden plus messenger sector potential. The simplest version of these models predicts the existence of very light gluinos which can be made heavier by a simple modification of the supersymmetry breaking sector.