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Theorists have also proposed models where the states are Rishons. Of course, again, this is the mainstream.
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Similarly, in Kaluza Klein theory: the quarks and leptons are expected to be special states of the compactified theory. Without preons, string theory could be also an answer but not in the line of your question quarks and leptons would be equivalent to some string states, so not "made of", but "same as". The most stablished -arguably- preon theory is Harari-Shupe, sometimes referred to as " rishon theory", but there are others. Another standard, but not mainstream, answer is that we call generically "preons" to the hypothetical components of quarks and leptons. The standard mainstream answer is to consider them as fundamentals. There is no real motivation for substructure, even though people speculate. But string theory gives a much more natural explanation of generations, in terms of the geometry of the compactification. Models of composite standard model fermions were interesting because they could explain the phenomenon of generations, the repeating standard model families. If they are not elementary, it is probably at a scale where they are revealed to be a string theory excitation, a quantum black hole. The quarks, on the other hand, along with the electrons, light, gravity, and the gluons and W and Z bosons, are perfectly elementary, in the sense that their interactions are described well by a renormalizable quantum field theory. It is usually obvious when a particle is composite. Neutrons and protons betrayed their non-elementary structure because of their magnetic moments and too-strong scattering at short distances. That atoms had internal stuff going on was obvious, because they are electrically neutral, and yet scatter light at definite magic frequencies. Light is not made of anything else, neither is gravity. The idea that everything has to be made of something else is not true. Quarks are probably not made of anything more fundamental. Leptons with their weak interactions are the equivalent of the screw driver. Feynman I think had said: "to see what a watch is made of one does not throw one watch on another watch and count the gears flying off.
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Nature though has surprised us before, and might do it again, once high energy lepton quark scattering experiments are designed and carried out in the future. At the moment there is no experimental indication that the quarks are not elementary. tell us that the quarks have a core.Įven in neutrino quark scattering the gluons will interfere, if the SM theory is correct at high energies. Due to the gluon exchanges it is hard to see how a hard core might appear in quark quark scattering to take the onion one level lower, i.e. The theoretical interpretation called the Standard Model, so successful at lower energies presupposes that the quarks are elementary. quarks on quarks at much higher energies then ever before, and we are waiting for results. The LHC is scattering protons on protons, i.e. They also have gluons which hold the quarks together due to the strong interaction, and the gluons have been seen experimentally, again with scattering experiments. The study of the interaction products organized the particles and resonances into what is now called the standard model, a grouping in families that have a one to one correspondence with the hypothesis that the hadrons (protons neutrons resonances) are composed out of quarks.īut not only. How do we know that protons and neutrons are formed from quarks? We have the results from painstaking experiments that showed us once more that deep inelastic scattering shows a hard core inside the protons and neutrons. Then we have the periodic table of elements which organizes itself well counting protons and neutrons. We have deep inelastic scatterings which showed that the atoms have a hard core, so they are not a uniformly distributed matter. How do we know atoms are formed from protons and neutrons? So atoms are formed from protons and neutrons, which are formed from quarks.īut where do these quarks come from? What makes them?