Prospects for Yukawa Unified SO(10) SUSY GUTs at the CERN LHC

TL;DR

This paper explores the potential to detect Yukawa-unified SO(10) SUSY GUTs at the CERN LHC by identifying specific superpartner spectra and decay signatures, enabling early discovery with minimal data.

Contribution

It provides detailed predictions of superpartner mass spectra and decay channels in Yukawa-unified SO(10) SUSY GUTs, and proposes detection strategies at the LHC.

Findings

Gluino pair production should be detectable with 1 fb^{-1} of data.

Characteristic dilepton mass edge can be observed above background.

Mass reconstruction of gluinos and neutralinos is feasible through combined signals.

Abstract

The requirement of t-b-\tau Yukawa coupling unification is common in simple grand unified models based on the gauge group SO(10), and it also places a severe constraint on the expected spectrum of superpartners. For Yukawa-unified models with \mu >0, the spectrum is characterized by three mass scales: {\it i}). first and second generation scalars in the multi-TeV range, {\it ii}). third generation scalars, \mu and m_A in the few-TeV range and {\it iii}). gluinos in the \sim 350-500 GeV range with chargino masses around 100-160 GeV. In such a scenario, gluino pair production should occur at large rates at the CERN LHC, followed by gluino three-body decays into neutralinos or charginos. Discovery of Yukawa-unified SUSY at the LHC should hence be possible with only 1 fb^{-1} of integrated luminosity, by tagging multi-jet events with 2--3 isolated leptons, without relying on missing E_T. A characteristic dilepton mass edge should easily be apparent above Standard Model background. Combining dileptons with b-jets, along with the gluino pair production cross section information, should allow for gluino and neutralino mass reconstruction. A secondary corroborative signal should be visible at higher integrated luminosity in the W1Z2-> 3\ell channel, and should exhibit the same dilepton mass edge as in the gluino cascade decay signal.