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Observation and properties of the X(3872) decaying to J/psi pi+ pi- in p anti-p collitions at s**(1/2) = 1.96-TeV.

Research output: Contribution to journalJournal article

<mark>Journal publication date</mark>14/10/2004
<mark>Journal</mark>Physical Review Letters
Issue number16
Pages (from-to)162002
<mark>Original language</mark>English


We report the observation of the X(3872) in the J/ψπ+π- channel, with J/ψ decaying to μ+μ-, in pp̅ collisions at sqrt[s]=1.96 TeV. Using approximately 230 pb-1 of data collected with the Run II 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.