Charmonium's K2 peak

Preprint
Publisher Website
Google Scholar
Abstract
The newly reported Y(4260) becomes the second most massive state in the charmonium family. In view of its mass, discovery channel J/psi pi pi, and estimated lepton width, we argue that it displaces the psi(4415) as the (largely) 4s vector charmonium state, and suggest some further study avenues that can exclude exotic assignments such as an Oddball state. 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.

This publication has 0 references indexed in Scilit: