【摘要】 本文讨论了Weinberg-Salam模型中W~±矢量中间玻色子(VIB)的磁矩问题.首先在规范对称性没有自发破缺的假定下,利用规范不变性得出正规顶角母泛函的方程,求出三线VIB正规顶角满足的Ward-Takahashi恒等式,证明了它的张量结构形式与裸的VIB三线耦合项相同,因而表明这时W~±介子不存在反常磁矩及反常电四极矩.对于有自发破缺的“实际”情况,通过在标量场作用项中引入明显破缺项的办法,对VIB的质量延拓问题完成整个讨论,进而给出了上述结论在这时仍然成立的证明.更多还原

【Abstract】 We discuss the magnetic moment of W~± bosons in W-S model. First we assume that there is no spontaneous symmetry broking, starting from the formalism of path integrals and using the gauge invariance requirement, we obtain the Ward-Takahashi identities for the 3-line VIB proper vertex functions and prove that its tensor structure is the same form as that of bare vertex couplings, which indicated the W~± bosons have neither anomalous magnetic moment nor electric quadrupole moment. For the realistic case of spontaneous symmetry breaking, we introduce in the Lagrangian an explicit symmetry breaking term. After discussing the problem of analytic continuation for mass of W~±bosons, we prove that the above mentioned conclusion is still valid here.更多还原