论文标题
$ d^\ ast（2380）$ dibaryon来自lattice qcd
$d^\ast (2380)$ dibaryon from lattice QCD
论文作者
论文摘要
理论上研究$（J^p，i）=（j^p，i）=（3^+，0）$的$δδ$ dibaryon共振$ d^\ ast（2380）$理论上研究了3型lattice QCD模拟带有较重的pion块（$m_π= 679，841 $ and $ 1018 $ mev）。通过使用HAL QCD方法，$ {}^7s_3 $通道中的中央$δ$-Uδ$潜力是从晶格数据中获得的，带有晶格间距$ a \ simeq 0.121 $ fm和lattice sime $ l \ simeq 3.87 $ fm。最终的电势显示出强烈的短距离吸引力，因此形成了与$ d^\ ast（2380）$相对应的准结合状态，以绑定能量$ 25 $ - $ 40 $ -40 $ MEV低于$δΔ$的阈值。还提取了从$δδ$到$ nn $的过渡潜力的张量部分，以调查$ s $ - 波$ΔΔ$系统之间的耦合强度，其中$ j^p = 3^+$和$ d $ -wave $ nn $ system。尽管过渡潜力在短距离内很强，但$ d^\ ast（2380）$ to $ nn $的衰减宽度在$ d $ - 波中受到了运动的抑制，这证明了我们在这项研究中探索的PION质量范围内的单通道分析是合理的。
The $ΔΔ$ dibaryon resonance $d^\ast (2380)$ with $(J^P, I)=(3^+, 0)$ is studied theoretically on the basis of the 3-flavor lattice QCD simulation with heavy pion masses ($m_π=679, 841$ and $1018$ MeV). By using the HAL QCD method, the central $Δ$-$Δ$ potential in the ${}^7S_3$ channel is obtained from the lattice data with the lattice spacing $a\simeq 0.121$ fm and the lattice size $L\simeq 3.87$ fm. The resultant potential shows a strong short-range attraction, so that a quasi-bound state corresponding to $d^\ast (2380)$ is formed with the binding energy $25$-$40$ MeV below the $ΔΔ$ threshold for the heavy pion masses. The tensor part of the transition potential from $ΔΔ$ to $NN$ is also extracted to investigate the coupling strength between the $S$-wave $ΔΔ$ system with $J^P=3^+$ and the $D$-wave $NN$ system. Although the transition potential is strong at short distances, the decay width of $d^\ast (2380)$ to $NN$ in the $D$-wave is kinematically suppressed, which justifies our single-channel analysis at the range of the pion mass explored in this study.
