期刊
EUROPEAN PHYSICAL JOURNAL A
卷 49, 期 5, 页码 -出版社
SPRINGER
DOI: 10.1140/epja/i2013-13059-x
关键词
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资金
- National Natural Science Foundation of China [10975038, 11035006, 11165005, 11121092, 11261130311]
- DFG [CRC110]
- NSFC
- Chinese Academy of Sciences [KJCX2-EW-N01]
- Ministry of Science and Technology of China [2009CB825200]
Inspired by the recent observation of a narrow resonance-like structure around 2360 MeV in the pn -> 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 2 similar to 67 MeV 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.
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