Abstract
Last year's X(3872) discovery was confirmed with the CDF II detector in pbarp collisions. We measure its mass to be
3871.3±0.7±0.4MeV/c2
. The source of X-mesons in the large CDF sample is resolved by studying their vertex displacement. We find
16.1±4.9±2.0
% of our X-sample comes from decays of b-hadrons, and the remainder from prompt sources: either direct production or by decay of (unknown) short-lived particles. The mix of production sources is similar to that observed for the psi(2S) charmonium state.