Charmonium's K2 peak

Details Charmonium's K2 peak Charmonium's K2 peak

2005-07-04

arxiv.org/abs/hep-ph/0507035v2

Phys.Rev.D72:031503,2005

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 2 figures added

Scientific paper

10.1103/PhysRevD.72.031503

The newly reported Y(4260) becomes the second most massive state in the charmonium family. We argue that it displaces the psi(4415) as the (largely) 4s vector charmonium state, recall s-d wave interference to explain the lack of a signal in e-e+ to hadrons and suggest some further study avenues that can exclude exotic meson assignments. The absence of a J/psi KK mode can be understood, beyond phase space suppression, to be a consequence of chiral symmetry. We also provide a model calculation in this sector showing that, although forcing the fit somewhat (which suggests a small sea quark wavefunction component), the state can be incorporated in a standard scheme.

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