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In particle physics, helicity is the projection of the angular momentum onto the direction of momentum. For massless spin-1⁄2 particles, helicity is equivalent to the chirality operator multiplied by $\hbar/2$, so may be used for related chirality questions as well.
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Charged fermions have both chiralities, with the same mass. Shouldn’t neutrinos, also massiv...
Photons are massless, so helicity coincide with chirality. … And also mixed state of helicity that does not even have to be equal to chirality. …
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A thought experiment about neutrinos
So they have left-handed helicity.
Now I imagine (this is a thought experiment, OK?) … , left-handed helicity. …