B oscillations
• Dm     DG = f (tH, tL )
–Separate eigenstates and measure each lifetime
•
1)BS ® DS+ DS-  (CP even)      Work continuing in triggering on these difficult hadronic modes (track/vertex/reconstruct)
2)BS ®  J/y f    (CP even&odd) Different angular distribution for mm allow separation of CP even and odd states
3)BS ® J/y h    (CP odd)
•
complementary method
Theory uncertainty
Other modes/methods?
bigger delta m, bigger delta width
delta width = 1/t1 – 1/t2 = (t2-t1)/t1t2
ie delta m propto delta t propto x_s. Bigger x_s, easier method to use

9000 j/psi phi in run 2
br(bs->dsds)<20% @95%