Baryon Resonances and SU_3 Mixing. I : N^<*>(1400)
スポンサーリンク
概要
- 論文の詳細を見る
The increase of the number of baryon resonances reveals a new feature that there are several resonances which have common isospin, hypercharge, spin and parity. This situation forces us to treat reducible representation of SU_3 for the classification of the baryon resonances. In the reducible representation which has to do with these resonances there appear two or more tensor components which are connected with the same isospin and hypercharge. In such a case the physical baryon fields are in general expressed as linear combinations of these tensor components. In this article we treat the baryons with spin S=1/2 and positive parity. In addition to the usual octet, a pion-nucleon resonance P^<11>, N(1400) or the so-called Roper resonance (mass≈1400 MeV, I=1/2, Y=1) is experimentally observed. Taking into consideration this resonance, we are obliged to use 8+8 or 8+10 or 8+27 to describe the baryons with S^p=1/2^+. The mass formula and the transition between the 3/2^+ baryon and the 1/2^+ baryon with an emission of a pion are discussed by adopting the effect of the mixing. The possibility 8+10 is excluded through an analysis of the decuplet decay. In order to distinguish between the other two possibilities the present experimental data are not enough. We discuss the most interesting case 8+8 in detail.
- 理論物理学刊行会の論文
- 1968-07-25
著者
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Konuma Michiji
Reseach Institute For Fundamental Physics Kyoto University
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Konuma Michiji
Research Institute For Fundamental Physics Kyoto University
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HALZEN Francis
Institute of Theoretical-Physics Centre of Nuclear Physics, University of Louvain
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Halzen Francis
Institute Of Theoretical-physics Centre Of Nuclear Physics University Of Louvain : Aspirant Of The N
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HALZEN Francis
Institute of Theoretical-Physics Centre of Nuclear Physics, University of Louvain : Aspirant of the National Foundation for Scientific Research
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