Bs oscillations
PB(t) ] e-Gt(1+cos(Dm t))
•Lifetime measurements: prelude to oscillations
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•For B mesons, Flavour eigenstates @weak eigenstates
•So B0 3B0
•Mixing parameter: x = Dm/G
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•LEP/Barbar: xd = 0.73   To date: xs > 14.6 Tevatron unique
•Usually measure by oscillating exponential; UK has developed new complementary method