This phenomenon is called flavor oscillation. The existence of neutral B meson oscillations is a fundamental prediction of the Standard Model of particle physics. It has been measured in the B0 – B0 system to be about 0.496 ps−1,[1] and in the B0 s– B0 s system to be Δms = 17.77 ± 0.10 (stat) ± 0.07 (syst) ps−1 measured by CDF experiment at Fermilab.[2] A first estimation of the lower and upper limit of the B0 s– B0 s system value have been made by the DØ experiment also at Fermilab.[3]