The BES III Collaboration has recently observed a vector resonance in the χc0ω channel, at a mass of about 4220 MeV, named Y(4220). Hints of a similar structure appear in the hcπ+π- 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 ratio of the Y(4220) into χc0ω and hcπ+π- is compatible with the prediction for such a tetraquark state.
Note on the newly observed Y(4220) resonance
Pilloni A.
;
2015-01-01
Abstract
The BES III Collaboration has recently observed a vector resonance in the χc0ω channel, at a mass of about 4220 MeV, named Y(4220). Hints of a similar structure appear in the hcπ+π- 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 ratio of the Y(4220) into χc0ω and hcπ+π- is compatible with the prediction for such a tetraquark state.File in questo prodotto:
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