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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) decaysrecorded in the CLEO detector. Data have been analyzed both for the inclusivereaction, where the decay products of the \eta_c are not identified, and forexclusive reactions, in which \eta_c decays are reconstructed in seven hadronicdecay channels. We find M(h_c)=3524.4 +/- 0.6 +/- 0.4 MeV which corresponds toa hyperfine splitting \Delta M_{hf}(1P) \equiv <M(3PJ)>-M(1P1)=+1.0+/-0.6+/-0.4MeV, and B(\psi(2S)->\pi0 h_c)xB(h_c->\gamma\eta_c)=(4. +/-0.8+/-0.7)x10^{-4}.

physical review letters

Observation of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>h</mml:mi><mml:mi>c</mml:mi></mml:msub><mml:mo stretchy="false">(</mml:mo><mml:mmultiscripts><mml:mi>P</mml:mi><mml:mn>1</mml:mn><mml:none /><mml:mprescripts /><mml:none /><mml:mn>1</mml:mn></mml:mmultiscripts><mml:mo stretchy="false">)</mml:mo></mml:math>State of Charmonium

Observation of thehc(P11)State of Charmonium