Phenomenology of the Minimal Supergravity SU(5) Model

Details Phenomenology of the Minimal Supergravity SU(5) Model Phenomenology of the Minimal Supergravity SU(5) Model

1994-07-07

arxiv.org/abs/hep-ph/9407254v1

Pramana 45 (1995) S85-S108

Physics

High Energy Physics

High Energy Physics - Phenomenology

based on a talk presented at the 3rd Workshop on High Energy Particle Physics, Madras, India, January 1994; 23 pages in LaTeX

Scientific paper

10.1007/BF02907967

The minimal grand unified supergravity model is discussed. Requiring radiative breaking of the electroweak gauge symmetry, the unification of b and tau Yukawa couplings, a sufficiently stable nucleon, and not too large a relic density of neutralinos produced in the Big Bang constrains the parameter space significantly. In particular, the soft breaking parameter m_1/2 has to be less than about 130 GeV, and the top quark Yukawa coupling has to be near its (quasi) fixed point. The former condition implies m_gluino < 400 GeV and hence very large production rates for gluino pairs at the LHC, while the latter constraint implies that the lighter stop and sbottom eigenstates are significantly lighter than the other squarks, leading to characteristic signatures for gluino pair events.

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