Yukawa Coupling Unification in Supersymmetric Models

Details Yukawa Coupling Unification in Supersymmetric Models Yukawa Coupling Unification in Supersymmetric Models

2003-02-18

arxiv.org/abs/hep-ph/0302155v2

JHEP 0306 (2003) 023

Physics

High Energy Physics

High Energy Physics - Phenomenology

38 pages, 15 figures. Fig.15 changed, some references were added. A copy of the paper with better resolution figures can be fo

Scientific paper

10.1088/1126-6708/2003/06/023

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 m_{16}~8-20 TeV, and small values of gaugino mass m_{1/2}<400 GeV. Such models require that a GUT scale mass splitting exists amongst Higgs scalars with m_{H_u}^2s gamma and (g-2)_mu constraints, there exists tension with the dark matter relic density unless m_{16}<3 TeV. These models offer prospects for a SUSY discovery at the Fermilab Tevatron collider via the search for chargino_1 neutralino_2 -> 3 leptons events, or via gluino pair production. If mu<0, Yukawa coupling unification to less than 5% can occur for m_{16} and m_{1/2}>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 m_{1/2} typically greater than about 2.5 TeV, in which case direct detection of sparticles may be a challenge even at the LHC.

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