arXiv:1412.7196·v2·High Energy Physics — Phenomenology
A note on the newly observed Y(4220) resonance
R. Faccini🇮🇹 · G. Filaci🇮🇹 · A.L. Guerrieri🇮🇹 · A. Pilloni🇮🇹 · A.D. Polosa🇮🇹
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.
Comments: 6 pages, 3 figures. Version accepted on Phys.Rev.D