2003/02/20 by D. Auto, Daniel Auto, H. Baer +9 · 4 citations
Computer Science · Physics and Astronomy · #Computational Physics and Python Applications #Gaugino #Gluino #Grand Unified Theory #Higgs boson #Neutrino Physics Research #Particle physics theoretical and experimental studies #Scalar (mathematics) #Superpartner #Superpotential #Supersymmetry #Yukawa potential #hep-ph
paper · pdf · doi:10.1088/1126-6708/2003/06/023
published as JHEP 0306:023,2003 · 38 pages, 15 figures. Fig.15 changed, some references were added. A copy of the paper with better resolution figures can be found at http://www.hep.fsu.edu/~balazs/Physics/Papers/2003/
arxiv created 2003/02/20 · openalex publication_date 2003/06/13 · arxiv updated 2014/11/17 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We present an updated assessment of the viability of t-b-tau Yukawa coupling unification in supersymmetric models. For the superpotential Higgs mass parameter mu>0, we find unification to less than 1% is possible, but only for GUT scale scalar mass parameter m16~8-20 TeV, and small values of gaugino mass m1/2<400 GeV. Such models require that a GUT scale mass splitting exists amongst Higgs scalars with mHu2<mHd2. Viable solutions lead to a radiatively generated inverted scalar mass hierarchy, with third generation and Higgs scalars being lighter than other sfermions. These models have very heavy sfermions, so that unwanted flavor changing and CP violating SUSY processes are suppressed, but may suffer from some fine-tuning requirements. While the generated spectra satisfy b->s gamma and (g-2)mu constraints, there exists tension with the dark matter relic density unless m16<3 TeV. These models offer prospects for a SUSY discovery at the Fermilab Tevatron collider via the search for chargino1 neutralino2 -> 3 leptons events, or via gluino pair production. If mu<0, Yukawa coupling unification to less than 5% can occur for m16 and m1/2>1-2 TeV. Consistency of negative mu Yukawa unified models with b->s gamma, (g-2)mu, and relic density all imply very large values of m1/2 typically greater than about 2.5 TeV, in which case direct detection of sparticles may be a challenge even at the LHC.