重子中七夸克成分qqq(q)~2的低位能谱

Low-lying Seven-quark qqq (q)~2 States in Baryon Spectrum

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能谱的预言,扩展到了七夸克系统qqq(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（qq^2 is investigated with the schematic flavor-spin interaction, as an extension of the qqqqq five quark model. The lowest qqq（qq）^2 state with an approximate energy 2.1 GeV and the spin-parity Jp1＋/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 qqqqq states above 2 GeV, it is possible for the high excited baryon-resonances to have substantial qqq（qq）^2 admixtures.