Radiative Breaking of the Minimal Supersymmetric Left-Right Model

TL;DR

This paper investigates a minimal SUSY Left-Right model where radiative effects induce symmetry breaking via a sneutrino vacuum expectation value, leading to realistic fermion masses and neutrino mixing, with constraints from collider data.

Contribution

It introduces a minimal SUSY Left-Right model without triplets and demonstrates radiative symmetry breaking through a sneutrino VEV, providing a novel mechanism within this framework.

Findings

SU(2)_R breaking via sneutrino VEVs at low energy

Mass limits derived from LHC and LEP data

Realistic fermion and neutrino mass generation

Abstract

We study a variation to the SUSY Left-Right symmetric model based on the gauge group $SU(3)_c\times SU(2)_L\times SU(2)_R\times U(1)_{BL}$. Beyond the quark and lepton superfields we only introduce a second Higgs bidoublet to produce realistic fermion mass matrices. This model does not include any $SU(2)_R$ triplets. We calculate renormalization group evolutions of soft SUSY parameters at the one-loop level down to low energy. We find that an $SU(2)_R$ slepton doublet acquires a negative mass squared at low energies, so that the breaking of $SU(2)_R\times U(1)_{BL}\rightarrow U(1)_Y$ is realized by a non-zero vacuum expectation value of a right-handed sneutrino. Small neutrino masses are produced through neutrino mixings with gauginos. Mass limits on the $SU(2)_R\times U(1)_{BL}$ sector are obtained by direct search results at the LHC as well as lepton-gaugino mixing bounds from the LEP precision data.