Abstract
We present the first precise measurement of the oscillation frequency . We use of data from collisions at collected with the CDF II detector at the Fermilab Tevatron. The sample contains signals of 3600 fully reconstructed hadronic decays and 37 000 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 consistent with oscillations. The probability that random fluctuations could produce a comparable signal is 0.2%. Under the hypothesis that the signal is due to oscillations, we measure and determine .
- Received 13 June 2006
DOI:https://doi.org/10.1103/PhysRevLett.97.062003
©2006 American Physical Society