I have a conceptual difficulty in understanding the electron spin. On the one hand, it is an experimental, observable feature of electrons. The problem is in understanding to what it belongs - to a bare electron or to an electron already coupled to the electromagnetic field. I think it is the latter. In other words, the electron spin characterizes a complicated object (a real system) rather than a "free" (non interacting) electron. It is like the total spin of a compound system. On the other hand, in theory we ascribe it to a "bare" electron solely. Do you think we have a conceptual problem here?
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