Quark confinement and the Higgs mechanism

[bluecap]

Can you give a reference to such a model?

(I spent an hour searching and a bit reading the following.. lol)

https://en.wikipedia.org/wiki/Preon
"In particle physics, preons are point particles, conceived of as subcomponents of quarks and leptons.[1] The word was coined by Jogesh Pati and Abdus Salam in 1974"

in the references inside it are the following papers:
http://www.slac.stanford.edu/cgi-wrap/getdoc/slac-pub-2310.pdf
"It would be premature to insist, for example, that presently established ideas of gauge theories are sufficient for fully explaining the interactions of the new hypothetical building blocks. In fact, the correct dynamics at very short distances may be radically different, and is likely to involve some
entirely new principles. However, when viewed at present energies and distances, in which quarks, leptons and ordinary gauge bosons are "point-
like", it should somehow reproduce currently accepted theories such as ' SU(2) x U(1) and QCD"

https://arxiv.org/pdf/hep-ph/9709227.pdf "Higgs Pain? Take a Preon!"
"Maybe normal QCD is nothing but the ”long-range” tail of the hyper-QCD that acts between preons, reaching out from the coloured quarks, but not from the leptons."

https://arxiv.org/ftp/hep-ph/papers/0411/0411313.pdf
"Why quarks cannot be fundamental particles
Many reasons why quarks should be considered composite particles are found in the book Preons by D'Souza and Kalman. One reason not found in the book is that all the quarks except for the u quark decay. The electron and the electron neutrino do not decay. A model of fundamental particles based upon the weak charge is presented."

Arxiv has many references as well.
https://arxiv.org/pdf/1307.6133.pdf
"In a model in which leptons, quarks, and the recently introduced hyperquarks are built up from two fundamental spin-1 2 preons, the standard model weak gauge bosons emerge as preon bound states. In addition, the model predicts a host of new composite gauge bosons, in particular those responsible for hyperquark and proton decay. Their presence entails a left-right symmetric extension of the standard model weak interactions and a scheme for a partial and grand unification of nongravitational interactions based on respectively the effective gauge groups SU(6)P and SU(9)G."

I can't find the book above and others to see more details. What I'd like to know is that If there are subquarks.. would the main symmetry group still be SU(3) or would SU(3) just be residual effect? And most importantly.. does the higher symmetry group occur at low energy below the electroweak scale or even below at the low quark-gluon plasma scale. Here we are making distinction to grand unified theory which has GUT energy scale. I'm asking about preon model where the energy scale is same as the SU(3) scale only.

So bottom line. Should all preon subquark model extend the symmetry group SU(3) or do they still use this even for the interactions among the preons inside the quark?

 

[PeterDonis]

I spent an hour searching and a bit reading the following

It would have been a better idea to read up on the relevant literature before starting this thread.

Should all preon subquark model extend the symmetry group SU(3) or do they still use this even for the interactions among the preons inside the quark?

The answer is "it depends"--it depends on the model. "Preon" does not name a specific model; it just names a general idea, that there should be "sub-particles" of which quarks and leptons are composed. A grand unified theory such as the SU(5) GUT, in which quarks and leptons are particular combinations of the underlying SU(5) particles, would meet this definition, so it's an example of a "preon" model. But there might be other "preon" models that work differently. And since none of this can be tested experimentally, it's all just speculation anyway.

In short, the questions you are asking don't really have definite answers. That being the case, this thread is closed.