2001/06/26 by FOCUS Collaboration, Jonathan M. Link, Link, Jonathan M.
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #hep-ex
paper · pdf · doi:10.48550/arxiv.hep-ex/0106093
To appear in the proceedings of the XXXVIth Recontres de Moriond on Electroweak Interactions and Unified Theories, Les Arcs, France, 10-17 March 2001
arxiv created 2001/06/26 · arxiv updated 2009/11/30
We report on a direct measurement of the mixing parameter y=(3.42+-1.39+-0.74)% in the D0-D0bar system by measuring the lifetime difference between the CP mixed final state K+pi- and the CP even state K+K-. We also present a study of the decay \ws based on a sample of 149+-31 observed events compared to 36760+-195 events observed in the Cabibbo favored channel D0->K-pi+. The observed branching ratio R=(0.404+-0.085+-0.025)% is used to obtain limits on the mixing parameters x' and y' and the doubly Cabibbo suppressed branching ratio, RDCS. These studies are based on a large sample of photoproduced charm mesons from the FOCUS experiment at Fermilab (FNAL-E831).