Re: Neutrinos

John Clark (
Thu, 19 Aug 1999 11:59:44 -0400

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Joseph C Fineman <> On Wednesday, August 18, 1999 Wrote:

>Neutrinos have no magnetic moment. The projection of the
>spin angular momentum of an old-fashioned massless neutrino along its
>linear momentum can have only _one_ value.

If neutrinos do have rest mass then handedness (not the spin) of the particle would be arbitrary, but that wouldn't erase the distinction between neutrinos and antineutrinos. In any frame of reference if a neutrino is left handed, and so far all detected have been, then the antineutrino would always be right handed in the same frame.

To my knowledge the question of a magnetic moment for the neutrino has not been settled experimentally, but I could be wrong about that.

John K Clark

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