LHC Phenomenology of SO(10) Models with Yukawa Unification

Abstract

In this paper we study an SO(10) SUSY GUT with Yukawa unification for the third generation. We perform a global chi^2 analysis given to obtain the GUT boundary conditions consistent with 11 low energy observables, including the top, bottom and tau masses. We assume a universal mass, m_{16}, for squarks and sleptons and a universal gaugino mass, M_{1/2}. We then analyze the phenomenological consequences for the LHC for 15 benchmark models with fixed m_{16} = 20 TeV and with varying values of the gluino mass. The goal of the present work is to (i) evaluate the lower bound on the gluino mass in our model coming from the most recent published data of CMS and (ii) to compare this bound with similar bounds obtained by CMS using simplified models. The bottom line is that the bounds coming from the same sign di-lepton analysis are comparable for our model and the simplified model studied assuming BR(gluino -> t tbar neutralino) = 100%. However the bounds coming from the purely hadronic analyses for our model are 10 - 20% lower than obtained for the simplified models. This is due to the fact that for our models the branching ratio for the decay gluino -> g neutralino is significant. Thus there are significantly fewer b-jets. We find a lower bound on the gluino mass in our models with M_{gluino} > 1000 GeV. Finally, there is a theoretical upper bound on the gluino mass which increases with the value of m_{16}. For m_{16} <= 30 TeV, the gluino mass satisfies M_{gluino} <= 2.8 TeV at 90% CL. Thus, unless we further increase the amount of fine-tuning, we expect gluinos to be discovered at LHC 14.

References in corpus (5)

• Search for gluino mediated bottom- and top-squark production in multijet final states in pp collisions at 8 TeV
• Projected Performance of an Upgraded CMS Detector at the LHC and HL-LHC: Contribution to the Snowmass Process
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• Scale hierarchies, symmetry breaking and particle spectra in SU(3)-family extended SUSY trinification
• On the Viability of Thermal Well-Tempered Dark Matter in SUSY GUTs
• Yukawa Unification in an SO(10) SUSY GUT: SUSY on the Edge
• Dark Matter at the Pseudoscalar Higgs Resonance in the pMSSM and SUSY GUTs
• A Built-in Horizontal Symmetry of $SO(10)$
• Yukawa Unification and Sparticle Spectroscopy in Gauge Mediation Models
• Masses of Third Family Vector-like Quarks and Leptons in Yukawa-Unified $E_6$
• A Pati-Salam SUSY GUT with Yukawa Unification