论文标题
$Nδ$相互作用可能的分子状态
Possible molecular states from the $NΔ$ interaction
论文作者
论文摘要
最近，在wasa-at-cosy上观察到了dibaryon $nδ（d_ {21}）$的提示，质量约为$ 30 \ pm10 $ meV，低于$nδ$阈值。与$ d^*（2380）$相比，它具有相对较小的结合能，并且宽度接近$δ$ baryon的宽度，这表明它可能是分子状态图中的二巴里亚人。在这项工作中，我们研究了$nδ$相互作用中的$ s $波分子状态。交互是通过交换$π$，$ρ$和$ω$介子来描述的。使用合理的参数，可以从交互中产生$ d_ {21} $绑定状态。结果还表明，可能存在两个可能的$ d_ {12} $和$ d_ {22} $状态，具有较小的绑定能。发现$π$交换是结合两个重子形成分子状态的最重要作用。对可能的$nδ（d_ {12}）$和$nδ（d_ {22}）$状态的实验搜索将有助于理解dibaryon $nδ（d_ {21}）$的提示。
Recently, a hint for dibaryon $NΔ(D_{21})$ was observed at WASA-AT-COSY with a mass about $30\pm10$ MeV below the $NΔ$ threshold. It has a relatively small binding energy compared with the $d^*(2380)$ and a width close to the width of the $Δ$ baryon, which suggests that it may be a dibaryon in a molecular state picture. In this work, we study the possible $S$-wave molecular states from the $NΔ$ interaction within the quasipotential Bethe-Salpeter equation approach. The interaction is described by exchanging $π$, $ρ$, and $ω$ mesons. With reasonable parameters, a $D_{21}$ bound state can be produced from the interaction. The results also suggest that there may exist two more possible $D_{12}$ and $D_{22}$ states with smaller binding energies. The $π$ exchange is found to play the most important role to bind two baryons to form the molecular states. An experimental search for possible $NΔ(D_{12})$ and $NΔ(D_{22})$ states will be helpful for understanding the hint of the dibaryon $NΔ(D_{21})$.
