A possible NN*(1440) quasi-molecular state
High Energy Physics - Phenomenology
2015-06-15 v1
Abstract
Inspired by the recent observation of a narrow resonance-like structure around 2360 MeV in the p+n to d + \pi 0 + \pi 0 cross section, the possibility of forming a NN*(1440) quasi-molecular state is investigated by using a meson exchange model in which the \pi, \sigma, \rho\ and \omega\ exchanges in t- and u-channels are considered. By adopting the coupling constants extracted from the relevant NN scattering and N*(1440) decay data, it is found that a deuteron-like quasi-molecular state of NN*(1440) with a binding energy in the range of from 2 to 67MeV can be formed. Therefore, it is speculated that the observed structure around 2360 MeV might be or may have a large component of the NN*(1440) quasi-molecular state.
Cite
@article{arxiv.1302.4790,
title = {A possible NN*(1440) quasi-molecular state},
author = {Lu Zhao and Peng-Nian Shen and Ying-Jie Zhang and Bing-Song Zou},
journal= {arXiv preprint arXiv:1302.4790},
year = {2015}
}
Comments
28 pages and 19 figures