光锥QCD求和规则中$Δ$重子的磁偶极、电四极和磁八极矩
Magnetic Dipole, Electric Quadrupole and Magnetic Octupole Moments of the $Δ$ Baryons in Light Cone QCD Sum Rules
摘要：
由于$Δ$重子的寿命非常短，在实验中直接测量这些系统的电磁矩几乎是不可能的，只能间接测量。虽然只有$Δ^{++}$和$Δ^{+}$体系的磁偶极矩有一些实验数据，但理论、唯象和晶格计算可能起着至关重要的作用。本文在光锥QCD求和规则下计算了这些重子的磁偶极矩（$μ_Δ$）、电四极矩（$Q_Δ$）和磁八极矩（$O_Δ$）。所得结果与其它唯象方法、格点量子色动力学和已有的实验结果进行了比较。
英文摘要：
Due to the very short life time of the $Δ$ baryons, a direct measurement on the electromagnetic moments of these systems is almost impossible in the experiment and can only be done indirectly. Although only for the magnetic dipole moments of $Δ^{++}$ and $Δ^{+}$ systems there are some experimental data, the theoretical, phenomenological and lattice calculations could play crucial role. In present work, the magnetic dipole ($μ_Δ$) , electric quadrupole ($Q_Δ$) and magnetic octupole ($O_Δ$) moments of these baryons are computed within the light cone QCD sum rules. The results are compared with the predictions of the other phenomenological approaches, lattice QCD and existing experimental data.
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