Observation of $B_s^0-{\bar{B}}_s^0$ Oscillations and Measurement of $\hat{I}”m_s$ in CDF

Abstract

We report the observation of $\B_s^0-\bar{B}_s^0$ oscillations performed by the CDF II detector using a data sample of 1 $f{b}^{-1}$ of $p\bar{p}$ collisions at $\sqrt{s}=1.96 \TeV$. We measure the probability as a function of proper decay time that the $B_s$ decays with the same, or opposite, flavor as the flavor at production, and we find a signal for $\B_s^0-\bar{B}_s^0$ oscillations. The probability that random fluctuations could produce a comparable signal is $8\times 10^{-8}$, which exceeds $5\ddot{I}ƒ$ significance. We measure $\hat{I}”m_s=17.77\pm 0.10(\mathrm{stat})\pm 0.07(\mathrm{syst})p{s}^{-1}$. A very important update has been presented by the CDF collaboration after I gave my talk, the latest available results on $B_s$ mixing are included here.

Prooceeding ICHEP 2006 Conference, 2006, Moscow - RU