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- W2949480412 abstract "We present an overview of the simplest supergravity models which enforce radiative breaking of the electroweak symmetry, namely the minimal $SU(5)$ supergravity model and the class of string-inspired/derived supergravity models based on the flipped $SU(5)times U(1)$ structure supplemented by a minimal set of additional matter representations such that unification occurs at the string scale ($sim10^{18}GeV$). These models can be fully parametrized in terms of the top-quark mass, the ratio $tanbeta=v_2/v_1$, and three supersymmetry breaking parameters ($m_{1/2},m_0,A$). The latter are chosen in the minimal $SU(5)$ model such that the stringent constraints from proton decay and cosmology are satisfied. In the flipped $SU(5)$ case we consider two string-inspired supersymmetry breaking scenaria: $SU(N,1)$ no-scale supergravity and a dilaton-induced supersymmetry breaking scenario. Both imply universal soft supersymmetry breaking parameters: $m_0=A=0$ and $m_0=coeff{1}{sqrt{3}}m_{1/2}, A=-m_{1/2}$ respectively. We present a comparative study of the sparticle and Higgs spectra of both flipped $SU(5)$ models and the minimal $SU(5)$ model and conclude that all can be partially probed at the Tevatron and LEPII (and the flipped models at HERA too). In both flipped $SU(5)$ cases there is a more constrained version which allows to determine $tanbeta$ in terms of $m_t,m_{tilde g}$ and which leads to much sharper and readily accessible experimental predictions. We also discuss the prospects for indirect experimental detection: a non-trivial fraction of the parameter space of the flipped $SU(5)$ models is in conflict with the present experimental allowed range for the $bto sgamma$ rare decay mode, and the one-loop electroweak radiative corrections imply the 90% CL upper bound" @default.
- W2949480412 created "2019-06-27" @default.
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- W2949480412 date "1993-07-02" @default.
- W2949480412 modified "2023-09-27" @default.
- W2949480412 title "The SuperWorlds of SU(5) and SU(5)xU(1): A Critical Assessment and Overview" @default.
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- W2949480412 hasPublicationYear "1993" @default.
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