Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2000-04-04
Phys.Lett.B487:313-320,2000
Physics
High Energy Physics
High Energy Physics - Phenomenology
16 pages including 3 figures, Revtex, major revisions are made
Scientific paper
10.1016/S0370-2693(00)00841-8
The minimal supersymmetric standard model with universal boundary conditions and "asymptotic" Yukawa unification is considered. The full one-loop effective potential for radiative electroweak symmetry breaking as well as the one-loop corrections to the charged Higgs boson, b-quark and tau lepton masses are included. The CP-even Higgs boson masses are corrected to two-loops. The relic abundance of the lightest supersymmetric particle (bino) is calculated by including its coannihilations with the next-to-lightest supersymmetric particle (lightest stau) consistently with Yukawa unification. The branching ratio of b --> s gamma is evaluated by incorporating all the applicable next-to-leading order QCD corrections. The bino-stau coannihilations reduce the bino relic abundance below the upper bound from cold dark matter considerations in a sizable fraction of the parameter space allowed by b --> s gamma for mu>0. Thus, the mu>0 case, which also predicts an acceptable b-quark mass, is perfectly compatible with data.
Gomez Mario E.
Lazarides George
Pallis Constantinos
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