论文标题
$ QQQS \ bar q $ pentaquarks的调查
Investigation of $qqqs\bar q$ pentaquarks in a chiral quark model
论文作者
论文摘要
我们在手性夸克模型的框架中调查了Pentaquark系统$ QQQS \ bar Q $。两个结构，$（qqq）（s \ bar {q}）$和$（qqs）（q \ bar {q}）$，具有所有可能的颜色，旋转，风味配置。该计算表明，有几种可能的共振状态，$sigmaπ$和$ n \ bar {k} $状态，带有$ ij^p = 0 \ frac {1} {1} {2} {2}^ - $，$σ^*π$，带有$ ij^p = 0 $ ij^p = 0 \ frac {5} {2}^ - $，$δ\ bar {k} $ with $ ij^p = 1 \ frac {3} {2} {2}^ - $和$Δ\ bar {k}^$ with $ ij^p = 1 \ frac = 1 \ frac}其中$ n \ bar {k} $状态带有$ ij^p = 0 \ frac {1} {2}^ - $可以用来解释$λ（1405）$，并且与另一个状态$σπ$一起，与之前提出的散射幅度的两杆式结构有关。 $λ（1520）$的衰减属性防止$σ^*π$用$ ij^p = 0 \ frac {3} {2} {2}^ - $ to $λ（1520）$，尽管Energy $ \ sim $ \ sim $ \ sim $ 1518 meV of $σ^*π$接近实验值的实验值$ $ up $λ（1520）$。其他共振状态通常具有很大的宽度。
We investigate the pentaquark system $qqqs \bar q$ in a framework of chiral quark model. Two structures, $(qqq)(s\bar{q})$ and $(qqs)(q\bar{q})$, with all possible color, spin, flavor configurations are considered. The calculations show that there are several possible resonance states, $Sigma π$ and $N \bar{K}$ state with $IJ^P=0\frac{1}{2}^-$, $Σ^* π$ with $IJ^P=0\frac{3}{2}^-$, $Σ^* ρ$ with $IJ^P=0\frac{5}{2}^-$, $Δ\bar{K}$ with $IJ^P=1\frac{3}{2}^-$ and $Δ\bar{K}^*$ with $IJ^P=1\frac{5}{2}^-$. Where the $N \bar{K}$ state with $IJ^P=0\frac{1}{2}^-$ can be used to explain the $Λ(1405)$, and together with another state $Σπ$ is related to the two-pole structure of the scattering amplitude proposed before. The decay properties of $Λ(1520)$ prevent the assignment of $Σ^* π$ with $IJ^P=0\frac{3}{2}^-$ to $Λ(1520)$, although the energy $\sim$ 1518 MeV of $Σ^* π$ is close to experimental value of $Λ(1520)$. Other resonance states generally have a large width.
