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

Abstract : 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.
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-00021776
Contributor : Claudine Bombar Connect in order to contact the contributor
Submitted on : Tuesday, May 11, 2004 - 3:05:50 PM
Last modification on : Tuesday, January 25, 2022 - 12:48:06 PM

### Citation

B. Aubert, R. Barate, D. Boutigny, J.M. Gaillard, A. Hicheur, et al.. Measurements of the mass and width of the $\eta_c$ meson and of an $\eta_c(2S)$ candidate. Physical Review Letters, American Physical Society, 2004, 92, pp.142002. ⟨in2p3-00021776⟩

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