What type of symmetry specifies in presence of what each not-charged particle (for example, neutrino) should have an antiparticle?

Question

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

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... — David Z, Dec 02 '11 at 09:39

score 3 · Answer 1 · answered Dec 01 '11 at 23:50

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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,

answered Dec 01 '11 at 23:50

Bowler

311

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But Majorana neutrinos are their own antiparticles. – Peter Shor Dec 02 '11 at 01:02
Further, lepton number is not conserved. – Ron Maimon Aug 23 '12 at 05:55

What type of symmetry specifies in presence of what each not-charged particle (for example, neutrino) should have an antiparticle?

1 Answers1

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