负宇称五夸克态  

The Pentaquark with the Negative Parity

作　　者：张翱[1] 吴魏霞[1] 杨少波[1] 

机构地区：[1]北京印刷学院,北京102600

出　　处：《北京印刷学院学报》2008年第4期68-70,共3页Journal of Beijing Institute of Graphic Communication

摘　　要：在Jaffe和Wilczek模型中存在负宇称的五夸克八重态和单态,这些五夸克态中的两个双夸克之间没有轨道激发,这些五夸克态比Θ+的质量要轻,利用Jaffe和Wilc-zek模型计算了Jp=12-的五夸克八重态和单态的质量与磁矩,结果表明与普通重子有轨道激发(l=1)的质量接近,得到一些重要的质量和磁矩关系式,这些五夸克态的质量范围在1360MeV和1540MeV之间,建议在实验上寻找Jp=1/2-的五夸克八重态和单态,其中有两个Jp=12-的五夸克态质量在Λ(1405)的附近,建议Λ(1405)是负宇称五夸克的一个候选者,如果将来的实验证实了这些态,将对Jaffe和Wilczek模型是极大的支持。In Jaife and Wilczek＇s diquark model, there should exist pentaquark octet and singlet with no orbital excitation between the diquark pair. These states are lighter than that of the θ＋ which is a anti-decuplet state and closes to the orbitally excited（1： 1） three-quark states in the conventional quark model. In this paper, we estimate their masses and magnetic moments. Their masses is in range of 1360MeVand1540MeV. Especially there are two additional J^p=1.2 baryons around A（1405）. We discuss the interesting possibility of interpreting A（1405） as a pentaquark. The experimental confirmation of these additional states will provide strong support of the Jaffe and Wilczek＇s diquark picture for the pentaquarks.

关 键 词：五夸克态 双夸克 

分 类 号：O572[理学—粒子物理与原子核物理]