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

doi:10.1088/1126-6708/2008/10/079

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Howard Baer et al JHEP10(2008)079 doi:10.1088/1126-6708/2008/10/079

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

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Howard Baer¹, Sabine Kraml², Sezen Sekmen³ and Heaya Summy^1,4

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Abstract References Cited By

The requirement of t−b−τ 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 μ>0, the spectrum is characterized by three mass scales: i) first and second generation scalars in the multi-TeV range, ii) third generation scalars, μ and m_A in the few-TeV range and iii) gluinos in the ~ 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 tilde chi

^±₁

⁰₂ → 3ℓ channel, and should exhibit the same dilepton mass edge as in the gluino cascade decay signal.

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