Observation of the Narrow State X ( 3872 ) → J / ψ π + π − in p ¯ p Collisions at s = 1.96 T e V
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Physical Review Letters（2004）
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摘要
The observation of a state consistent with X(3872) decaying into J/ψπ+π- was reported. The X(3872) mass was measured to be 3871.3±0.7(stat)±0.4(syst)MeV/c2 from a sample of 730±90 candidates. The observed width was consistent with the detector resolution. The results were found to be converging well with the measurements by the Belle Collaboration using b± decays.
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