The authors conclude: "a localised electron can be more accurately represented as a condensate – an extended state comprising of photons and electrons. This model deviates from the traditional point-like conception of an electron, introducing a framework where a quantum electron exhibits non-point-like characteristics when localised".<p>Which why not, given a modern understanding of protons?<p>See also <a href="https://en.wikipedia.org/wiki/Electromagnetic_mass" rel="nofollow">https://en.wikipedia.org/wiki/Electromagnetic_mass</a>