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I don't know that they are, but I wouldn't be surprised.
They have an incredibly short "lifespan" (~0.0000000000003 seconds) and they decay into electrons so it would be hard to prove that they do occur in nature.
edit: a quick check on the internet and they decay into many different kinds of particles, not just electrons.
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[–] oedipusaurus_rex ago (edited ago)
I don't know that they are, but I wouldn't be surprised.
They have an incredibly short "lifespan" (~0.0000000000003 seconds) and they decay into electrons so it would be hard to prove that they do occur in nature.
edit: a quick check on the internet and they decay into many different kinds of particles, not just electrons.