Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2003-12-23
Phys.Rev.Lett.92:142001,2004
Physics
High Energy Physics
High Energy Physics - Experiment
8 pages, also available at http://w4.lns.cornell.edu/public/CLNS/, A Few Minor Corrections. The version accepetd for publicati
Scientific paper
10.1103/PhysRevLett.92.142001
We report on the observation of the eta_{c}^{prime}(2^{1}S_{0}), the radial excitation of eta_{c}(1^{1}S_{0}) ground state of charmonium, in the two-photon fusion reaction gamma gamma rightarrow eta_{c}^{prime} rightarrow K_{S}^{0}K^{pm}pi^{mp} in 13.6 fb^{-1} of CLEO II/II.V data and 13.1 fb^{-1} of CLEO III data. We obtain M(eta_{c}^{prime})=3642.9 pm 3.1(stat) pm1.5(syst) MeV, and M(eta_{c})=2981.8 pm1.3(stat) pm 1.5(syst) MeV. The corresponding values of hyperfine splittings between ^{1}S_{0} and ^{3}S_{1} states are \Delta M_{hf}(1S)=115.1 pm 2.0 MeV, Delta M_{hf}(2S)=43.1 pm3.4 MeV. Assuming that the eta_{c} and eta_{c}^{prime} have equal branching fractions to K_{S}K pi, we obtain Gamma_{gamma gamma}(eta_{c}^{prime})=1.3 pm 0.6 keV.
Asner David M.
CLEO Collaboration
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