SO(10) inspired gauge-mediated supersymmetry breaking

TL;DR

This paper explores a SO(10)-based supersymmetric model with gauge mediation, demonstrating it can naturally achieve a 125 GeV Higgs mass, predict specific collider signatures, and satisfy lepton flavor violation constraints.

Contribution

It introduces a SO(10)-inspired gauge-mediated supersymmetry breaking model that naturally explains the Higgs mass and predicts distinctive collider and lepton flavor violation phenomenology.

Findings

Achieves Higgs mass around 125 GeV without extreme superpartner masses.

Predicts Higgs diphoton rate at or below the Standard Model expectation.

Identifies sneutrino as a viable next-to-lightest supersymmetric particle.

Abstract

We consider a supersymmetric model motivated by a SO(10) grand unified theory: the gauge sector near the supersymmetry scale consists of SU(3)_c x SU(2)_L x U(1)_R x U(1)_{B-L}. We embed this model in minimal gauge mediation and incorporate neutrino data via an inverse seesaw mechanism. Also in this restricted model, the additional D terms can rise the light Higgs mass in a sizable way. Therefore, it is much easier to obtain m_h \simeq 125 GeV without the need to push the supersymmetry spectrum to extremely large values as it happens in models with minimal supersymmetric standard model particle content only. We show that this model predicts a diphoton rate of the Higgs equal to or smaller than the standard model expectation. We discuss briefly the collider phenomenology with a particular focus on the next to lightest supersymmetric particle in which this model offers the sneutrino as an additional possiblity. Moreover, we point out that, also in this model variant, supersymmetry can be discovered in Z' decays even in scenarios in which the strongly interacting particles are too heavy to be produced at a sizable rate at the LHC with 14 TeV. In addition, we show that lepton flavor violating observables constrain the size of the neutrino Yukawa couplings for which, in particular, muon decays and \mu-e conversion in heavy atoms are of particular importance. Once these constraints are fulfilled the rates for \tau decays are predicted to be below the reach of near-future experiments.