Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1994-02-09
Nucl.Phys.B426:269-300,1994
Physics
High Energy Physics
High Energy Physics - Phenomenology
33 pages, 10 figures (not included) CERN-TH.7163/94
Scientific paper
10.1016/0550-3213(94)90313-1
The condition of unification of gauge couplings in the minimal supersymmetric standard model provides successful predictions for the weak mixing angle as a function of the strong gauge coupling and the supersymmetric threshold scale. In addition, in some scenarios, e.g.\ in the minimal SO(10) model, the tau lepton and the bottom and top quark Yukawa couplings unify at the grand unification scale. The condition of Yukawa unification leads naturally to large values of $\tan\beta$, implying a proper top quark--bottom quark mass hierarchy. In this work, we investigate the feasibility of unification of the Yukawa couplings, in the framework of the minimal supersymmetric standard model with (assumed) universal mass parameters at the unification scale and with radiative breaking of the electroweak symmetry. We show that strong correlations between the parameters $\mu_0$ and $M_{1/2}$ appear within this scheme. These correlations have relevant implications for the sparticle spectrum, which presents several characteristic features. In addition, we show that due to large corrections to the running bottom quark mass induced through the supersymmetry breaking sector of the theory, the predicted top quark mass and $\tan\beta$ values are significantly lower than those previously estimated in the literature.
Carena Marcela
Olechowski Marek
Pokorski Stefan
Wagner Carlos E. M.
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