Summary
Both particles B0, as a possible representant of second-class currents with {ie55-01}∼5.81 GeV, and a very light U-boson with mU∼102 keV and couplingsg″∼2·10-7, the gauge particle of a U1′-group, which has now eaten up the axion, belong to the same multiplet.
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Rodenberg, E. Common footing of the supersymmetric U-boson and of second-class currents. Lett. Nuovo Cimento 36, 55–59 (1983). https://doi.org/10.1007/BF02817173
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DOI: https://doi.org/10.1007/BF02817173