  The minimal standard electroweak model yields approximately half the observed
value of the $K_L$-$K_S$ mass difference. Antisymmetric tensor fields
incorporated into the standard model can provide the rest $0.5\times(\Delta
m_{LS})_{\exp}$. The effective lepton--lepton, quark--lepton and quark--quark
tensor interactions induced by the charged tensor particles are presented.
