q ij ( δ q $_{ij}$)$_{LR}$ ( RL ) d 12 2 · 10 − $^{4}$(0 . 002) d 13 0 . 08 d 23 0 . 01 d 11 4 . 7 · 10 − 6 u 11 9 . 3 · 10 − 6 u 12 0 . 02 TABLE II: The phenomenological upper bounds on the chirality-mixing parameters ( δ q $_{ij}$)$_{NM}$ , N = M and q = u, d . The constraints are given for m$_{˜}$ q = 1 TeV and x ≡ m 2 ˜ $_{g}$/m 2 ˜ q = 1. We assume that the phases could suppress the imaginary parts by a factor ∼ 0 . 3. The constraints on ( δ d 12 , $_{13}$)$_{NM}$ , ( δ d $_{23}$)$_{NM}$ and ( δ u $_{12}$)$_{NM}$ , and ( δ q $_{ii}$)$_{NM}$ are based on, respectively, Refs. [12], [14] and [16, 17]. The bounds are the same for δ q LR and δ q $_{RL}$, except for ( δ d $_{12}$)$_{NM}$ , where the bound in parentheses refers to NM = RL . The experimental constraints on the ( δ q $_{ij}$)$_{LR}$ parameters in the quark-squark sector are presented in Table II. Very strong constraints apply for the imaginary part of ( δ q $_{11}$)$_{LR}$ from electric dipole moments (EDMs). The bounds given here correspond to the experimental upper limit on the EDM of the neutron, d$_{n}$ < 2 . 9 · 10 − 26 e cm [17]. For x = 4 and a phase smaller than 0.1, the EDM constraints on ( δ u,d 11 )$_{LR}$ are weakened by a factor of ∼ 6. We consider supersymmetric models with gauge-mediated SUSY breaking in the presence of contributions induced by gravity at the Planck scale. While the former follows the flavor structure dictated by the one already present in the standard model, the latter allows, in general, for further intergenerational sfermion flavor mixings. In Section III A we set our initial conditions at the scale of gauge-mediation, m$_{M}$ , and in Section III B give approximate analytical expressions for the flavor and CP-violating δ q parameters defined in Section II. The soft terms at m$_{M}$ and at the electroweak scale, m$_{Z}$ , are linked by the MSSM renormalization group (RG) equations [18]. Details on the RG 7 III. HYBRID GAUGE-GRAVITY MODELS