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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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What is chirality?
It is closely related to helicity, but it is not the same (though it is equivalent for massless particles). … For an excellent exposition on chirality and helicity, see http://www.quantumdiaries.org/2011/06/19/helicity-chirality-mass-and-the-higgs/ …