Summary
Nontrivial topological structure of the magnetic monopole could be retrieved in the gauge field theory ofSU 2×U 1 symmetry. Dirac's quantization conditions of themagnetic charge predicts the square sine of the mixing angle to be onequarter.
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Chang, K.L., Liaw, S.S. Magnetic monopole and mixing angle in Weinberg-Salam's theory. Lett. Nuovo Cimento 39, 23–27 (1984). https://doi.org/10.1007/BF02790489
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DOI: https://doi.org/10.1007/BF02790489