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I think that charging symmetry assumes antiparticle presence, which has an opposite charge sign . And what symmetry assumes existence of an antiparticle at a neutral particle

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  • $\begingroup$ See also this question. $\endgroup$ – Peter Shor Dec 2 '11 at 1:00
  • $\begingroup$ Would it be possible to clarify the question title? And the question body, for that matter? I don't quite understand what it's asking... $\endgroup$ – David Z Dec 2 '11 at 9:39
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Anti-matter is not just the opposite charge sign. To convert matter to anti-matter you apply the C-parity operation which change more quantum numbers than just charge. In the case of the neutrino the lepton number is switched,

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