Phenomenological Consequences of Right-Handed Down Squark Mixings

The mixings of $d_R$ quarks, hidden from view in the standard model (SM), are naturally the largest if one has an Abelian flavor symmetry. With supersymmetry (SUSY) their effects can surface via ${\tilde{d}}_R$ squark loops. Squark and gluino masses are at TeV scale, but they can still induce effects comparable to SM in $B_d$ (or $B_s$) mixings, while $D^0$ mixing could be close to recent hints from data. In general, $\mathrm{CP}$ phases would be different from SM, as may be indicated by recent B factory data. Presence of nonstandard soft SUSY breakings with large $\tan \beta$ could enhance $b\to d\gamma$ (or $s\gamma$) transitions.