Effects of Superheavy Quarks and Leptons in Low-Energy Weak Processes KL→μμ￣,K+→π+νν￣ and K0K￣0
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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 ΔS≠0 neutral-current processes K_L→μμ^^-, K^+→π^+νν^^- and K_L-K_S 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 K_L→μμ^^- and K^+→π^+νν^^- be absent up to order αG_F yields a rather stringent bound on the magnitude of light-heavy quark mixing: Such mixing has to be less than m_W/m_<quark> times a factor much smaller than unity.
- Progress of Theoretical Physics
Progress of Theoretical Physics 65(1), p297-314, 1981-01
Published for the Research Institute for Fundamental Physics by Physical Society of Japan