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We investigate potentially important effects due to the existence of superheavy quarks and leptons of the sequential type in higher·order weak processes at low energies. The second-order LlS * 0 neutral-current processes Kl. ~ I'ii, K~ 1[+ vi) and KL-Ks mass difference are analysed allowing for fermions of masses comparable to or larger than the weak-boson mass in the Kobayashi-Maskawa scheme and in the general sequential scheme with an arbitrary number of generations. Possible connection between heavy·quark masses and light-heavy quark mixing are also examined. The requirement that the rare decay processes such as KL ~ l1ii and K+ ~ 1[+ vi) be absent up to order aGF yields a rather stringent bound on the magnitude of light-heavy Quark mixing: Such mixing has to be less than mW/mQuack times a factor much smaller than unity.

Effects of Superheavy Quarks and Leptons in Low-Energy Weak Processes KL-> Formula, K+-> + Formula and K0 Formula