Observation and Properties of the X(3872) Decaying to J/psipi+pi- in pp¯ Collisions at &surd;(s)=1.96 TeV (original) (raw)

2004, Physical Review Letters

We report the observation of the X(3872) in the J/ψπ+π- channel, with J/ψ decaying to μ+μ-, in pp¯ collisions at √(s)=1.96 TeV. Using approximately 230 pb-1 of data collected with the RunII D0 detector, we observe 522±100 X(3872) candidates. The mass difference between the X(3872) state and the J/ψ is measured to be 774.9±3.1(stat)±3.0(syst) MeV/c2. We have investigated the production and decay characteristics of the X(3872) and find them to be similar to those of the ψ(2S) state.

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