A note on the newly observed Y(4220) resonance

Authors :: Faccini, R.
Filaci, G.
Guerrieri, A. L.
Pilloni, A.
Polosa, A. D.
Source :: Phys. Rev. D 91, 117501 (2015)
Publication Year :: 2014
Abstract: BES III Collaboration has recently observed a vector resonance in the chi_{c0} omega channel, at a mass of about 4220 MeV, named Y(4220). Hints of a similar structure appear in the h_c 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 chi_{c0} omega and h_c pi+ pi- is compatible with the prediction for such a tetraquark state.<br />Comment: 6 pages, 3 figures. Version accepted on Phys.Rev.D