重子中七夸克成分qqq(q¯q)2 的低位能谱
Low-lying Seven-quark qqq(q¯q)2 States in Baryon Spectrum
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摘要: 在非相对论夸克模型内，利用手征超精细相互作用，把原来对五夸克系统qqqq¯q 能谱的预言，扩展到了七夸克系统qqq(q¯q)2 的基态和轨道第一激发态能谱的计算，所使用的参数也是来自于五夸克系统。预言了最低七夸克态的能量大约是2.1 GeV，自旋-宇称是JP =1/2+或者JP =1/2-。由于在这个能区也存在一些三夸克系统和五夸克系统，所以能量在2 GeV 以上的重子激发态可能是这3 种夸克成分的混合。The low-lying energy spectra of 7-quark systems qqq(q¯q)2 is investigated with the schematic flavor-spin interaction, as an extension of the qqqq¯q five quark model. The lowest qqq(q¯q)2 state with an approximate energy 2.1 GeV and the spin-parity JP =1/2+ or JP =1/2-, has been predicted with the parameters used in the five quark system.Because of the overlap with the corresponding qqq and qqqq¯q states above 2 GeV, it is possible for the high excited baryon-resonances to have substantial qqq(q¯q)2 admixtures.Abstract: The low-lying energy spectra of 7-quark systems qqq(q¯q)2 is investigated with the schematic flavor-spin interaction, as an extension of the qqqq¯q five quark model. The lowest qqq(q¯q)2 state with an approximate energy 2.1 GeV and the spin-parity JP =1/2+ or JP =1/2-, has been predicted with the parameters used in the five quark system.Because of the overlap with the corresponding qqq and qqqq¯q states above 2 GeV, it is possible for the high excited baryon-resonances to have substantial qqq(q¯q)2 admixtures.
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