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Why are neutrinos always lefthanded?

  1. Jan 21, 2010 #1
    Posted in quantum physics, maybe wrong session.

    Neutrinos are massive particles, so that i would expect that their helicity depends on coordinate system. Why are they lefthanded at all times?
    I heard that in decays righthanded neutrinos are suppressed by a factor (1-beta)/2, but i don't know why.
  2. jcsd
  3. Jan 21, 2010 #2

    Vanadium 50

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    Neutrinos can have either helicity. The left-handedness refers to their chirality.
  4. Jan 21, 2010 #3


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    The W boson does not attach to the right neutrinos, only to the left ones.
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