Abstract
Last year's X(3872) discovery was confirmed with the CDF II detector in [Formula: see text] collisions. We measure its mass to be 3871.3±0.7±0.4 MeV/c 2. 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 ψ(2S) charmonium state.
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