Sparticle and Higgs masses within minimal string unification

摘要

We consider the sparticle and Higgs spectroscopy in a class of superstring inspired models in which the string threshold corrections ensure the consistency of the string unification scale with the low energy data. The lightest neutralino is almost a pure bino and it is predicted to be the lightest sparticle (LSP). Requiring that Omega(sub LSP) <= 0.9, we find an upper bound on its mass which, in the case of dilaton supersymmetry breaking, turns out to be 160 GeV. The experimental lower bound on the chargino mass, m(sub chi) +- > 65 GeV, implies that the lower bound on the LSP mass is m(sub LSP) m > 32(45) GeV, corresponding to mu < > 0. We also determine the lower and upper bounds on the Higgs and other sparticle masses. For instances, the lightest Higgs lies between 85 and 145 GeV, while the mass of the lightest charged sparticle satisfies 47 GeV < m(sub ebar(sub R)) < 325 GeV. In the low tan beta regime, we find that 1.5 (<=) tan beta <= 3.5 (author). 10 refs, 5 figs. (Atomindex citation 28:022304)