Observation and properties of the X(3872) decaying to J/ψπ+π- in pp̄ collisions at √s = 1.96 TeV
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2004-10-15
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Abazov, V. M.
Abbott, B.
Abolins, M.
Acharya, B. S.
Adams, D. L.
Adams, M.
Adams, T.
Agelou, M.
Agram, J. L.
Ahmed, S. N.
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The discovery of a new particle, X(3872) by the Belle collaboration in the decay mode B±→ XK± (X→ J/ψπ+π - was discussed. It was found that the mass of the X(3872) was measured to be 3872.0 ± 0.6(stat) ± 0.5 (syst) MeV/C2. The X(3872) particle were observed in approximately 230 pb-1 of data with a significance of 5.2 standard deviations. The results show that there was no significant differences between the X(3872) and the cc̄ state ψ (2S).
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Physical Review Letters, v. 93, n. 16, 2004.