Quarks have emerged from the evidence that protons and neutrons are composite particles. This has led to the formulation of the QCD and the "asymptotic freedom" hypothesis. This theoretical framework explains the bond between nucleons. But the hypothesis of their existence has stumbled upon the impossibility of detecting them as free particles. The question is whether there is any experimental confirmation of their existence as components of nucleons.
Dear Carlos Figueroa
The answer is of coarse NON!
But, its a question not to poss.
JES
Yes and check Murray Gell-Mann, I believe he found Quark and he name it. He named it Quwark or something like that , but later for easier to pronounce changed to quark that we know, It is obvious that he discovered it. he has few books.
They have been (and are) experimentally confirmed indirectly. But I think, in general, better talk about fields than particles in such scales.
opa! Thank you very much Preston. Very good your text. I will see the papers you recommend.
Carlos.
Dear Carlos Figueroa
Yes. They have been directly scattered against within nucleons in the second half of the 1960's, that is, in the first years of operation of the SLAC facility:
Ref: Breidenbach M. et al. (1969) Observed Behavior of Highly Inelastic Electron-Proton Scattering, Phys.Rev.Let.,Vol.23,No.16,935-939.
https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.23.935.
Best Regards, André
Have you ever touched a lion? Lions and quarks are 'seen', by shooting photons at them and 'seeing' how they bounce off. We believe in their existence even though they can never escape their cage (hopefully for lions).
I understand, after reading what Preston recommends that the evidence is indirect. That is if we crash protons against antiprotons, the pieces that result from the crash make up a range of different mesons, from pions to heavier and more exotic particles. It is evident from its diversity that it is composite particles. Although we cannot directly detect their constituents, they all eventually decay into neutrinos, electrons, and positrons. It is a puzzle in which you have to do a detective task to identify these sneaky components. I suppose the best way to explain what is actually detected is to propose the existence of sneaky quarks and colour theory and the idea of "asymptotic freedom": This is the basis of chromodynamics.
It happens that recently an outstanding physicist of particles, Steve Reucroft, experimental by the way, made an alternative proposal worthy of being taken into account.
I attach it in case you want to study it.
Carlos Figueroa
Dear Carlos, composite particles contain only what they disintegrate into. If protons decay into mesons and pions, then they consist of them only. Quarks are science fiction, phantoms. Please look at the Feynman diagram beta-neutron decay: d-quark turns into u-quark. But quarks are indivisible!
Louis de Broglie put forward the "neutrino theory of light." Based on it, I created a vortex model of particles. If you are interested look at the book "Electromagnetic Gravity. Part 1" in my profile.
Yours
Valeriy Pakulin
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