K0 decays as analyzer of B0 decays: How to measure the sign of ΔmB

We consider decays of neutral B mesons with production of neutral K mesons. They allow the use of oscillations of both b flavor and strangeness simultaneously. New effects arising can be used to find B-decay parameters, in particular, signs of ΔmB and ΔΓB. Discrimination between effectively small and large CP violation is discussed. It is shown that secondary decay distributions themselves may be used to extract parameters of the primary B decay