Why can’t photon have spin 0?


The z-projection of the photon’s spin could be m_s = 0, +-1. Why though is m_s always -1 or +1? I understand that if m_s was zero, this would imply that the spin lies in the x,y-plane. Why is this not possible?

submitted by /u/dengmam to r/askscience
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Source: Reddit: TGIOKDI Upvoted

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