期刊
EUROPEAN PHYSICAL JOURNAL A
卷 50, 期 3, 页码 -出版社
SPRINGER
DOI: 10.1140/epja/i2014-14057-2
关键词
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资金
- European FEDER funds [FIS2011-28853-C02-01]
- Generalitat Valenciana in the program Prometeo [2009/090]
- Natural Science Foundation of China [11375080, 10975068]
- Natural Science Foundation of Liaoning Scientific Committee [2013020091]
- Chinese Academy of Sciences [KJCX2.YW.W10]
- National Natural Science Foundation of China [11005007]
- European Community-Research Infrastructure Integrating Activity Study of Strongly Interacting Matter (acronym HadronPhysics3) under the Seventh Framework Programme of EU [283286]
- Spanish Ministerio de Economia y Competitividad
We apply an extension of the Weinberg compositeness condition on partial waves of L = 1 and resonant states to determine the weight of the meson-baryon component in the Delta(1232) resonance and the other members of the baryon decuplet. We obtain an appreciable weight of pi N in the Delta(1232) wave function, of the order of 60%, which looks more natural when one recalls that experiments on deep inelastic and Drell Yan give a fraction of pi N component of 34% for the nucleon. We also show that, as we go to higher energies in the members of the decuplet, the weights of the meson-baryon component decrease and they already show a dominant part for a genuine, non-meson-baryon, component in the wave function. We write a section to interpret the meaning of the Weinberg sum rule when it is extended to complex energies and another one for the case of an energy-dependent potential.
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