论文标题
磁性背景中的轴向耦合常数
Axial coupling constant in a magnetic background
论文作者
论文摘要
核子轴向耦合常数$ g_a $是使用有限的能量总规则在外部均匀磁场的情况下计算的。质子，中子和轴向载体电流的相关函数既可以计算出HADRONIC和QCD扇区。一旦隔离型分中的轴向贡献，就会考虑一个双和规则，即，对于质子和中子电流的外部力矩，通常的QCD轮廓积分。外部磁场的效果主要通过中等内部核子耦合常数$λ_n（b）$和hadronic阈值$ s_0（b）$。结果，轴向耦合常数在磁场存在下降低。
The nucleon axial coupling constant $g_A$ is calculated in the presence of an external uniform magnetic field using finite energy sum rules. The correlation function of proton, neutron and axial-vector currents is calculated both the hadronic and the QCD sector. Once the axial contribution in the form factor is isolated, a double sum rule is considered, i.e., the usual QCD contour integration for the external moments of both the proton and neutron current. The effects of the external magnetic field come mainly through the in-medium current-nucleon coupling constants $λ_N(B)$ and the hadronic thresholds $s_0(B)$ provided by the nucleon-nucleon correlators. As a result, the axial coupling constant decreases in the presence of the magnetic field.
