arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1704.08503nucl-thhep-phnucl-ex
收藏

手征组分夸克模型中$d^*(2380)$的六夸克结构

Six-quark structure of $d^*(2380)$ in chiral constituent quark model

Qi-Fang Lü, Fei Huang, Yu-Bing Dong, Peng-Nian Shen, Zong-Ye Zhang

摘要:

在手征SU(3)夸克模型下,利用单团簇结构重新研究了$d^*(2380)$的结构,并成功地解释了$N-N$散射数据和氘核的结合能.用变分法求解了这样一个六夸克系统的束缚行为。试验波函数被选择为在轨道空间中具有$0\hbarω$激发的$[(0s)^6]_{orb}$的基本球对称分量和在轨道空间中具有$2\hbarω$激发的$[(0s)^5(1s)]_{orb}$和$[(0s)^4(0p)^2]_{orb}$的内部结构变形分量的组合,两者都具有空间对称性[6]。结果表明,系统的质量约为$2356$ MeV,这与两团组态计算结果和WASA合作组的测量结果定性一致.这一结果告诉我们,只要适当地引入由手征对称性引起的中程相互作用,系统的质量将在相当大的程度上得到降低。这也意味着,所观察到的$d^*$是一个六夸克束缚态相对于$ΔΔ$阈值,这再次支持的结论,$d^*$是一个六夸克占主导地位的状态。

英文摘要:

The structure of $d^*(2380)$ is re-studied with the single cluster structure in the chiral SU(3) quark model which has successfully been employed to explain the $N-N$ scattering data and the binding energy of deuteron. The binding behavior of such a six quark system is solved by using a variational method. The trial wave function is chosen to be a combination of a basic spherical symmetric component of $[(0s)^6]_{orb}$ in the orbital space with $0\hbarω$ excitation and an inner structural deformation component of $[(0s)^5(1s)]_{orb}$ and $[(0s)^4(0p)^2]_{orb}$ in the orbital space with $2\hbarω$ excitation, both of which are in the spatial [6] symmetry. It is shown that the mass of the system is about $2356$ MeV, which is qualitative consistent with the result both from the two-cluster configuration calculation and from the data measured by the WASA Collaborations. This result tells us that as long as the medium-range interaction due to the chiral symmetry consideration is properly introduced, the mass of system will be reduced in a rather large extent. It also implies that the observed $d^*$ is a six-quark bound state with respect to the $ΔΔ$ threshold, which again supports the conclusion that $d^*$ is a hexaquark dominant state.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑