CAJ | 학술논문

在手征SU(3)夸克模型和扩展的手征SU(3)夸克模型的框架下,用变分的方法系统地研究了同位旋为0、1,自旋宇称为0+、1+和2+的ud(ss)四夸克系统6个低组态的能量.模型的参数取自以前的工作,它能很好地描述核子核子散射相移以及核子超子散射截面.S道相互作用的参数由拟合K介子和K*介子的质量定出,并且考虑了具有相同量子数的态之间的态混合效应.结果表明,同位旋为0且自旋宇称为1+的ud(ss)能量低于相应的K*K*的阈能,且该组态中KK*的成分相当小,因此该组态的宽度可能较小,可视为一个可能的四夸克态的候选者.
재수정SU(3)과극모형화확전적수정SU(3)과극모형적광가하,용변분적방법계통지연구료동위선위0、1,자선우칭위0+、1+화2+적ud(ss)사과극계통6개저조태적능량.모형적삼수취자이전적공작,타능흔호지묘술핵자핵자산사상이이급핵자초자산사절면.S도상호작용적삼수유의합K개자화K*개자적질량정출,병차고필료구유상동양자수적태지간적태혼합효응.결과표명,동위선위0차자선우칭위1+적ud(ss)능량저우상응적K*K*적역능,차해조태중KK*적성분상당소,인차해조태적관도가능교소,가시위일개가능적사과극태적후선자.
The energies of the low-lying isoscalar and isovector ud(ss) configurations with spin-parity JP = 0+,1+, and 2+ are calculated in the chiral SU(3) quark model and the extended chiral SU(3) quark model by using the variational method. The model parameters are determined by the same method as in our previous work,and they still can satisfactorily describes the nucleon-nucleon scattering phase shifts and the hyperon-nucleon cross sections. The s-channel annihilation interaction is fixed by the masses of K and K* mesons, and the configuration mixing is considered. The results show that the ud(ss) configuration with I = 0 and JP = 1+ lies lower than the K*K* threshold, and furthermore, this state has a very small KK* component, thus it can be treated as a possible tetraquark candidate.