2009/11/24 by Howard Baer, Sabine Kraml, André Lessa +3
Physics and Astronomy · #Dark Matter and Cosmic Phenomena #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #hep-ph
paper · pdf · doi:10.1007/jhep02(2010)055
published as JHEP 1002:055,2010 · 32 pages including 31 EPS figures
arxiv created 2009/11/24 · openalex publication_date 2010/02/01 · arxiv updated 2010/04/23 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We examine the prospects for testing SO(10) Yukawa-unified supersymmetric models during the first year of LHC running at √ s = 7 TeV , assuming integrated luminosity values of ∼0.1-1 fb−1. We consider two cases: the Higgs splitting (HS) and the D-term splitting (DR3) models. Each generically predicts light gluinos and heavy squarks, with an inverted scalar mass hierarchy. We hence expect large rates for gluino pair production followed by decays to final states with large b-jet multiplicity. For 0.2 fb−1 of integrated luminosity, we find a 5σ discovery reach of m g ∼ 400 GeV even if missing transverse energy, E T miss , is not a viable cut variable, by examining the multi-b-jet final state. A corroborating signal should stand out in the opposite-sign (OS) dimuon channel in the case of the HS model; the DR3 model will require higher integrated luminosity to yield a signal in the OS dimuon channel. This region may also be probed by the Tevatron with 5–10 fb−1 of data, if a corresponding search in the multi-b + E T miss channel is performed. With higher integrated luminosities of ∼1 fb−1, using E T miss plus a large multiplicity of b-jets, LHC should be able to discover Yukawa-unified SUSY with m g \lesssim 630 GeV . Thus, the year 1 LHC reach for Yukawa-unified SUSY should be enough to either claim a discovery of the gluino, or to very nearly rule out this class of models, since higher values of m g lead to rather poor Yukawa unification.