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## Main Question or Discussion Point

Just a quick question on photon orbital angular momentum.

In the equation for photon energy: E

Is OAM counted in the p

The normal relation for p seems to be p = kħ but isn't k just a vector?

In the equation for photon energy: E

^{2}= p^{2}c^{2}+ m^{2}c^{4}Is OAM counted in the p

^{2}c^{2}part? Or does the above equation only apply to photons with normal momentum and there is another term for the angular momentum?The normal relation for p seems to be p = kħ but isn't k just a vector?