A Review of hc(1P1), etac(1S) and etac(2S)
Abstract
Recent experimental results on charmonium hc(1P1), ηc(1S) and ηc(2S) from Belle, BaBar, CLEO and BESIII are reviewed. hc production and properties, the ηc(1S) lineshape and the observation of ηc(2S) in ' decays are discussed.
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