Light Sterile Neutrino and Low Scale Left-Right Symmetry in D-brane inspired $SU(4{)}_C\times SU(2{)}_L\times SU(2{)}_R$

Abstract

Motivated by the ongoing searches for new physics at the LHC, we explore the low energy consequences of a D-brane inspired $SU(4{)}_C\times SU(2{)}_L\times SU(2{)}_R$ (4-2-2) model. The Higgs sector consists of an $SU(4)$ adjoint, a pair $H+\bar{H}$ in $(4,1,2)+(\bar{4},1,2)$, and a bidoublet field in $h(1,2,2)$. With the $SU(4)$ adjoint the symmetry breaks to a left-right symmetric $SU(3{)}_C\times U(1{)}_{B-L}\times SU(2{)}_L\times SU(2{)}_R$ model. A missing partner mechanism protects the $SU(2{)}_R$ Higgs doublets in $H,\bar{H}$, which subsequently break the symmetry to the Standard Model at a few TeV scale. An inverse seesaw mechanism generates masses for the observed neutrinos and also yields a sterile neutrino which can play the rôle of dark matter if its mass lies in the keV range. Other phenomenological implications including proton decay are briefly discussed.

Comments: 12 pages, 1 figure