A note on the newly observed Y(4220) resonance
Abstract
BES III Collaboration has recently observed a vector resonance in the chic0 omega channel, at a mass of about 4220 MeV, named Y(4220). Hints of a similar structure appear in the hc pi+ pi- channel. We find that the two observations are likely due to the same state, which we identify with one of the expected diquark-antidiquark resonances with orbital quantum number L = 1. This assignment fulfills heavy quark spin conservation. The measured branching fractions ratio into chic0 omega and hc pi+ pi- is compatible with the prediction for such a tetraquark state.
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