Constraining supersymmetry with precision data

We discuss the results of a global fit to precision data in supersymmetric models. We consider both gravity- and gauge-mediated models. As the superpartner spectrum becomes light, the global fit to the data typically results in larger values of χ2. We indicate the regions of parameter space which are excluded by the data. We discuss the additional effect of the B(B→Xsγ) measurement. Our analysis excludes chargino masses below MZ in the simplest gauge-mediated model with μ>0, with stronger constraints for larger values of tanβ. copyright 1997 American Institute of Physics