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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. $\endgroup$ Commented Dec 2, 2011 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
    Commented Dec 2, 2011 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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    $\begingroup$ But Majorana neutrinos are their own antiparticles. $\endgroup$ Commented Dec 2, 2011 at 1:02
  • $\begingroup$ Further, lepton number is not conserved. $\endgroup$
    – Ron Maimon
    Commented Aug 23, 2012 at 5:55

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