Is the Y(4260) just a coupled-channel signal?
Abstract
The Ds-Ds*, D*-D*, and Ds*-Ds*, P-wave channels in the energy region of the Y(4260) charmonium structure are studied in a coupled-channel model applied to JPC=1-- c-cbar resonances. The three channels exhibit enhancements that peak at 4.27 GeV, 4.26 GeV, and 4.33 GeV, respectively, having widths ranging from 80 to 200 MeV. However, no S-matrix poles are found, other than those associated with the psi(2D,4160) and psi(4S,4415). The conclusion is that the observed Y(4260) signal(s) in pi-pi J/psi is (are) probably associated with the opening of the aforementioned channels, resulting in a resonance-like structure caused by the tail of the psi(3S,4040) resonance, roughly midway between the mentioned P-wave thresholds and a sharp kinematical minimum at about 4.4 GeV present in both the experimental and the model scattering amplitude.
Keywords
Cite
@article{arxiv.hep-ph/0605317,
title = {Is the Y(4260) just a coupled-channel signal?},
author = {Eef van Beveren and George Rupp},
journal= {arXiv preprint arXiv:hep-ph/0605317},
year = {2007}
}
Comments
6 pages, 8 figures