The mass m η c and total width Γ η c tot of the η c meson have been measured in two-photon interactions at the SLAC e + e − asymmetric B Factory with the BABAR detector. With a sample of approximately 2500 reconstructed η c → K 0 S K ± π ∓ decays in 88 fb − 1 of data, the results are m η c = 2982.5 ± 1.1 ( stat ) ± 0.9 ( syst ) MeV / c 2 and Γ η c tot = 34.3 ± 2.3 ( stat ) ± 0.9 ( syst ) MeV / c 2 . 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 / c 2 and width of 17.0 ± 8.3 ( stat ) ± 2.5 ( syst ) MeV / c 2 . This observation is consistent with expectations for the η c ( 2 S ) state.
Measurements of the Mass and Width of the ηc Meson and of an ηc(2S) Candidate
FERRONI, Fernando
2004-01-01
Abstract
The mass m η c and total width Γ η c tot of the η c meson have been measured in two-photon interactions at the SLAC e + e − asymmetric B Factory with the BABAR detector. With a sample of approximately 2500 reconstructed η c → K 0 S K ± π ∓ decays in 88 fb − 1 of data, the results are m η c = 2982.5 ± 1.1 ( stat ) ± 0.9 ( syst ) MeV / c 2 and Γ η c tot = 34.3 ± 2.3 ( stat ) ± 0.9 ( syst ) MeV / c 2 . 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 / c 2 and width of 17.0 ± 8.3 ( stat ) ± 2.5 ( syst ) MeV / c 2 . This observation is consistent with expectations for the η c ( 2 S ) state.| File | Dimensione | Formato | |
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