The decay e and the anomalous W-boson magnetic moment

We compute the branching ratio of e decay, allowing for an anomalous magnetic dipole moment of the W boson. We find that an enhancement up to 3 orders of magnitude can be achieved for the interval -33. In models with heavy neutral leptons, such as the "fine-tuning of parameters" scenario depicted by Cheng and Li, this leads to a large 10-11 -1012 branching ratio.