Determine the parameter Bk of the K0-K0bar system by means of the   precise Cabibbo-Kobayashi-Maskawa matrix elements
  Taking use of the relation between weak CP phase and the other three mixing angles in Cabibbo-Kobayashi-Maskawa matrix postulated by us before, the uncertainty coming from the weak interaction can be reduced, furthermore, by means of the relation between the calculation result about mixing parameter epsilon from the box diagrams and the related experimental data in K0-K0bar system, the parameter Bk can be extracted. We take Vud, Vub and Vtb as inputs, when we let them vary in the ranges 0.9745<=Vud<=0.9760, 0.0018<=Vub<=0.0045 and 0.9991<=Vtb<=0.9993, we find the permitted window for Bk is 0.444<=Bk<=1.242. With the more precise measurment on the CKM matrix elements in the future, we can determine Bk more precisely. 
Yong Liu, Jing-Ling Chen and Wu-Sheng Dai