2 Answers

  1. In In the Standard Model, quarks, leptons, and bosons are considered structureless (point-like) particles. This is experimentally verified at accelerators by measuring cross-sections of elastic scattering of particles.

    However, the approximation is a point-like (structureless) particle, which may depend (and most likely always depends)on from energy. At very low energies, even an atom can be considered a structureless particle. In electromagnetic interactions, the electron is “wrapped” in a cloud of virtual photons and e⁺e-pairs and has a classical radius of 2.81 × 10-1⁵ m. This is 3 times the radius of the proton. In deep inelastic interactions with a proton, a high-energy electron behaves like a point particle with a radius 10 million times smaller than that of the proton (~10-22 m) . This feature allows an electron, when passing through a proton “to ” see” the parton (quark) structure of the proton.

  2. There is a basic epistemological principle: any hypothetical object should be considered nonexistent until proven otherwise. It doesn't matter if this object is called “the internal structure of an elementary particle”, “god” or “Russell's teapot”. Otherwise, instead of investigating real nature, we will drown in refuting everything that humanity can imagine. And humanity has a rich imagination.

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