Measurements of the mass and width of the eta_c meson and of an eta_c(2S) candidate

Details Measurements of the mass and width of the eta_c meson and of an eta_c(2S) candidate Measurements of the mass and width of the eta_c meson and of an eta_c(2S) candidate

2003-11-18

arxiv.org/abs/hep-ex/0311038v1

Phys.Rev.Lett.92:142002,2004

Physics

High Energy Physics

High Energy Physics - Experiment

7 pages, 4 figures, submitted to Physical Review Letters

Scientific paper

10.1103/PhysRevLett.92.142002

The mass and total width of the eta_c meson have been measured in two-photon interactions at the SLAC asymmetric B-Factory with the BABAR detector. With a sample of approximately 2500 reconstructed eta_c -> Ks K pi decays in 88 fb-1 of data, the measured eta_c mass and width are respectively 2982.5 +- 1.1 (stat) +- 0.9 (syst) MeV/c2 and 34.3 +- 2.3 (stat) +- 0.9 (syst) MeV/c2. Using the same decay mode, a second resonance with 112 +- 24 events is observed with a mass of 3630.8 +- 3.4 (stat) +- 1.0 (syst) MeV/c2 and width of 17.0 +- 8.3 (stat) +- 2.5 (syst) MeV/c2. This observation is consistent with expectations for the eta_c(2S) state.

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