CPViolation and Flavor Changing Effects inKandBMesons from Nonuniversal Soft Breaking Terms

We analyze $\mathrm{CP}$ violation and flavor changing effects in a minimal supersymmetric standard model with arbitrary nonuniversal soft breaking. Large flavor changing neutral current effects are naturally expected in the $K$ system, even in the absence of quark-squark flavor misalignment. However, the $B$ system is sensitive to new supersymmetric contributions only if nonuniversality implies, not only different soft terms for the three generations but also a large quark-squark misalignment. The only exceptions are processes with a leading chirality changing contribution proportional to $\tan \beta$ (as $b\to s\gamma$).