重子中七夸克成分qqq(qˉq)2的低位能谱
Low-lying Seven-quark qqq(qˉq)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qqqqˉq能谱的预言,扩展到了七夸克系统qqq(qˉq)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.+或者JP=1?.由于在这个能区22Abstract: The low-lying energy spectra of 7-quark systems qqq(qˉq)2 is investigated with the schematic flavor-spin interaction, as an extension of the qqqqˉq five quark model. The lowest qqq(qˉq)2 state with an approximate energy 2.1 GeV and the spin-parity JP= 1+or JP= 1?, has been predicted with the parameters used in the five quark system. 2 2 Because of the overlap with the corresponding qqq and qqqqˉq states above 2 GeV, it is possible for the high excited baryon-resonances to have substantial qqq(qˉq)2 admixtures.
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