Abstract
We report the observation of oscillations from a time-dependent measurement of the oscillation frequency . Using a data sample of of collisions at collected with the CDF II detector at the Fermilab Tevatron, we find signals of 5600 fully reconstructed hadronic decays, 3100 partially reconstructed hadronic decays, and 61 500 partially reconstructed semileptonic decays. We measure the probability as a function of proper decay time that the decays with the same, or opposite, flavor as the flavor at production, and we find a signal for oscillations. The probability that random fluctuations could produce a comparable signal is , which exceeds significance. We measure and extract .
- Received 18 September 2006
DOI:https://doi.org/10.1103/PhysRevLett.97.242003
©2006 American Physical Society