A note on the newly observed Y(4220) resonance
High Energy Physics - Phenomenology
2015-06-10 v2
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.
Keywords
Cite
@article{arxiv.1412.7196,
title = {A note on the newly observed Y(4220) resonance},
author = {R. Faccini and G. Filaci and A. L. Guerrieri and A. Pilloni and A. D. Polosa},
journal= {arXiv preprint arXiv:1412.7196},
year = {2015}
}
Comments
6 pages, 3 figures. Version accepted on Phys.Rev.D