Parameter Bounds in the Supersymmetric Standard Model from Charge/Color Breaking Vacua

Abstract

We calculate limits on the trilinear soft-breaking parameter, $A_t$, in the Minimal Supersymmetric Standard model by requiring the absence of nonzero top squark vacuum expectation values. Assuming a low $\tan \beta$, which implies a large top Yukawa coupling, we also calculate one-loop corrections to the effective potential. The resulting numerical calculations of the charge/color breaking limits are presented as best-fit surfaces. We compare these results with the analytical limit, $A_t^2<3(m_2^2+m_q^2+m_t^2)$, and find that although this bound is a good estimate of the charge/color breaking bounds for a simplified model of the top sector, stricter bounds are found by a numerical minimization of the Minimal Supersymmetric Standard Model potential.

Comments: 23 pages, 5 Postscript figures, uses revtex.sty and epsf.sty