Abstract
Simple representation for the average value of the W-boson one-loop polarization tensor in a magnetic field B = const, calculated in the ground state of the tree-level spectrum, is derived. It corresponds to Demeur’s formula for electron in QED. The energy of this state, describing effective particle mass, is computed by solving the Schwinger-Dyson equation. As application, we investigate the effective mass squared at the threshold of the tree-level instability, B → Bc = m2/e, and show that it is positive. In this way the stability of the W-boson spectrum is established. Some peculiarities of the results obtained and other applications are discussed.
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