Summary
Recent precision measurements of the proton-electron mass ratio confirm a theoretical evaluation dating from 1975 to one part in 107. The theory suggests that this discrepancy, which the measurements show to be 0.833±0.436 parts in 107, may evidence a very small inequality between the magnitudes of the proton charge and the electron charge, theoretically predicted to be 1.07 parts in 107.
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Reference
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Aspden, H. The assessment of a theory for the proton-electron mass ratio. Lett. Nuovo Cimento 38, 423–426 (1983). https://doi.org/10.1007/BF02783637
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DOI: https://doi.org/10.1007/BF02783637