Phenomenology of the Minimal Supergravity SU ( 5 ) Model
نویسنده
چکیده
The minimal grand uni ed supergravity model is discussed. Requiring radiative breaking of the electroweak gauge symmetry, the uni cation of b and Yukawa couplings, a su ciently stable nucleon, and not too large a relic density of neutralinos produced in the Big Bang constrains the parameter space signi cantly. In particular, the soft breaking parameter m1=2 has to be less than about 130 GeV, and the top quark Yukawa coupling has to be near its (quasi) xed point. The former condition implies m~ g 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 signi cantly lighter than the other squarks, leading to characteristic signatures for
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