Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1995-02-28
Phys.Rev.D52:4178-4182,1995
Physics
High Energy Physics
High Energy Physics - Phenomenology
10 pages, LaTeX, 3 figures (included)
Scientific paper
10.1103/PhysRevD.52.4178
We propose a string-derived model based on the gauge group $SU(5)\times U(1)$ which satisfies the stringent constraints from no-scale supergravity, allows gauge coupling unification at the string scale, and entails previously unexplored correlations among various sectors of the model. All supersymmetric observables are given in terms of a single mass parameter with self-consistency of the model determining the rest, including $\tan\beta=2.2-2.3$ and $m_t\approx175\GeV$. A small non-universality of the scalar masses at the string scale produces a downward shift in the right-handed slepton masses at the electroweak scale, such that for $m_{1/2}\gsim180\GeV$ these particles become lighter than the lightest neutralino. This cutoff in the parameter space entails the imminent discovery of charginos at the Tevatron via trilepton events ($m_{\chi^\pm_1}<90\GeV$). Also, the lightest Higgs boson ($m_h<90\GeV$), the lightest chargino, and the right-handed sleptons ($m_{\tilde\ell_R}<50\GeV$) should be readily observable at LEPII. We also discuss the model predictions for $B(b\to s\gamma)$, $(g-2)_\mu$, $R_b$, and the prospects for direct neutralino dark matter detection.
Lopez Javier
Nanopoulos Dimitri
Zichichi Antonino
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