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Indeed, at first glance they refer to different systems: Bohrovsky - to a system consisting of two "elementary" particles, and the last two - to the characteristics of the electron per se, which is usually considered as the most elementary POINT particle. It would seem that the elastic scattering of various particles by an electron confirms, judging by the form factor, that the electron is pointlike up to distances of the order of 10 -17 ! But this is the purest geometrical delusion, since the simplest considerations, such as those expressed by Ya.B. Zeldovich back in 1957. and the specific studies carried out, presented in [13] (see also the numerous works of A.V. Burinsky, V.V. Kassandrov, etc.), convince us that the electronin its stationary state (i.e., not, for example, in an atom, where its "volume" is polarized in accordance with, say, the nonlinear Euler-Heisenberg interaction) has the topology of a torus. And therefore, at distances smaller than the above, there is not an electron body, but, so to speak, a “donut hole”, which is fixed by measurements of the elastic form factor of an electron at medium energies! M.A. Markov is still in the 60s.
By the way, massive neutrinos have the same topology of a torus, which, except for the remarkable specialist in spinor calculus R. Jehle, were also seriously foreseen by other theorists. Of the largest: J. Clauder and J. Wheeler, simultaneously with Zeldovich, all in the same 1957. The figure of the torus simply follows as a result of the choice of certain spinor representations!
The torus-forming effect was discovered recently by recalculations (ie, in a model-dependent manner) for a proton propagating at a speed approaching the speed of light. In this case, the proton gradually turns into a "doubly concave lens" with thinning to zero in the center. In other words, the time-switching charge dipole is no longer present in this “leaky pancake” (V. L. Ginzburg called this process “blowing out”).
And now look here