Observation of h_c(^1P_1) State of Charmonium

Details Observation of h_c(^1P_1) State of Charmonium Observation of h_c(^1P_1) State of Charmonium

2005-05-24

arxiv.org/abs/hep-ex/0505073v2

Phys.Rev.Lett.95:102003,2005

Physics

High Energy Physics

High Energy Physics - Experiment

9 pages postscript,also available through http://www.lns.cornell.edu/public/CLNS/2005/, submitted to PRL

Scientific paper

10.1103/PhysRevLett.95.102003

The h_c(1P1) state of charmonium has been observed in the reaction \psi(2S) -> \pi0 h_c -> (\gamma\gamma)(\gamma\eta_c) using 3.08 million \psi(2S) decays recorded in the CLEO detector. Data have been analyzed both for the inclusive reaction, where the decay products of the \eta_c are not identified, and for exclusive reactions, in which \eta_c decays are reconstructed in seven hadronic decay channels. We find M(h_c)=3524.4 +/- 0.6 +/- 0.4 MeV which corresponds to a hyperfine splitting \Delta M_{hf}(1P) \equiv -M(1P1)=+1.0+/-0.6+/-0.4 MeV, and B(\psi(2S)->\pi0 h_c)xB(h_c->\gamma\eta_c)=(4. +/-0.8+/-0.7)x10^{-4}.

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