Thursday, February 21, 2013

1302.4790 (Lu Zhao et al.)

A possible NN*(1440) quasi-molecular state    [PDF]

Lu Zhao, Peng-Nian Shen, Ying-Jie Zhang, Bing-Song Zou
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.
View original: http://arxiv.org/abs/1302.4790

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