Answers are grounded in this paper and cite their sources.
We reexamine the solution of the minimal Zee model by comparing with the data of the SNO experiment, and conclude that the model is strongly disfavored but not yet excluded by the observations. Two extensions of the Zee model are briefly discussed both of which introduce additional freedom and can accommodate the data.
No takes yet. Share an insight, caveat, or question.
Frampton et al. (2002) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: