Transitions between neutral mesons in multiquark schemes

The six-quark scheme based on the gauge group SU(2)sub(L)xU(1) is applied to find the relations for the K0 - anti K0, D0-anti D0, B0-anti B0, Bsub(s)sup(0)-anti Bsub(s)sup(0), T0-anti T0 and Tsub(c)sup(0)-anti Tsub(c)sup(0) transition amplitudes for finite four-momenta of the external lines of Feynman square diagrams. The correctness is estimated of using the approximation of small four-momentum valent quarks, which form neutral mesons similar to K0(anti K0) mesons. The limitations are imposed on the parameters of the unitary matrix of the weak charged currents at arbitrary masses of the t quark. Numerical values of the mixing and CP violation parameters for neutral systems similar to K0-anti K0 are estimated