All Questions
4 questions
21
votes
3
answers
4k
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Why do people say that neutrinos are either Dirac or Majorana fermions?
The question of whether a given particle "is" a Dirac or Majorana fermion is more subtle than is sometimes presented. For example, if we just consider the "old" Standard Model with massless neutrinos, ...
- 49.4k
0
votes
0
answers
234
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Time evolution of a massive fermion produced in a state of definite chirality
But for massive particles like an electron, the chirality is not conserved in time i.e. if an electron is produced in the state $e_L$ at time t=0, at a later time it becomes a mixture of left-handed ...
- 27.2k
5
votes
1
answer
421
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Photons are self-conjugate but neutrinos may or may not: why is that?
Caution: This may be a very naive question but I find it confusing. Moreover, I believe this question is based on potential misconception. I would like it to be clarified.
Although the neutrinos are ...
- 27.2k
32
votes
5
answers
3k
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Why do or don't neutrinos have antiparticles?
This was inspired by this question. According to Wikipedia, a Majorana neutrino must be its own antiparticle, while a Dirac neutrino cannot be its own antiparticle. Why is this true?
- 11.5k