Phys. Rev. Lett. 83, 2902–2905 (1999)Study of the χc0(13P0) State of Charmonium Formed in p̅ p AnnihilationsReceived 3 June 1999; published in the issue dated 11 October 1999 The resonance parameters of χc0, the 31P0 resonance of charmonium, have been measured at the Fermilab Antiproton Accumulator by means of the reaction p̅ p→χc0→γJ/ψ→γ(e+e-). The results are M(χc0) = 3417.4-1.9+1.8±0.2MeV/c2, Γ(χc0) = 16.6-3.7+5.2±0.1MeV, and Γ(χc0→p̅ p)×B(χc0→J/ψγ)×B(J/ψ→e+e-) = 2.89-0.53+0.67±0.14eV. Using known branching ratios we also obtain Γ(χc0→p̅ p) = 8.0-1.5-1.9+1.9+3.5keV. These results are discussed in relation to the other χcJ states and to theoretical predictions. © 1999 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.83.2902
DOI:
10.1103/PhysRevLett.83.2902
PACS:
14.40.Gx, 13.75.Cs
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