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Results tagged with helicity
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user 1325
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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Why is the $S_{z} =0$ state forbidden for photons?
I can't improve on KDN's answer, but given Todd's comments this is an attempt to rephrase KDN's answer in layman's terms.
A system is only in an eigenstate of spin around an axis if a rotation about …
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