Lets assume that we can produce a quark-gluon plasma and then we try to cool it down, what will happen to it ?

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    $\begingroup$ It will disintegrate into hadrons (baryons and mesons). These will fly away and decay into stable particles. $\endgroup$ – mpv Feb 27 '14 at 12:31

You get the quark-anti quark (meson) and triple quark baryon (or triple antiquark i.e. anti-baryon) bound states (where the quarks/anti-quarks interact with gluons).

At a collider experiment, there is no need to "actively cool" the quark gluon plasma, this happens automatically and one sees the hadrons (mesons/baryons/anti-baryons) in the detector.

In the evolution of the early universe, this is what started the "hadron epoch".

See e.g. also http://home.web.cern.ch/about/physics/heavy-ions-and-quark-gluon-plasma

  • $\begingroup$ I heard that quarks and gluons must be bounded together in normal condition..if so ,when we cool down this plasma these fundamental particles must return bounded to form protons,neutrons ecc ecc or i am missing something? $\endgroup$ – Andrea Scaglioni Feb 27 '14 at 12:33
  • $\begingroup$ yes, exactly. Protons and neutrons are baryons (but in principle other baryons could be formed as well but these are typically short lived as are the mesons). $\endgroup$ – Andre Holzner Feb 27 '14 at 12:38
  • $\begingroup$ Ok so,i a certain sense we can say that we are able to re-create matter from foundamental particles? Or in another words to re-create the right conditions where baryonic matter took place after the big bang right? $\endgroup$ – Andrea Scaglioni Feb 27 '14 at 12:43
  • $\begingroup$ Wonderful..this could teach us so many things about the origin of matter in the universe $\endgroup$ – Andrea Scaglioni Feb 27 '14 at 12:46
  • $\begingroup$ yes, the purpose of colliders is to have energies (or better: energy densities) similar to those shortly after the big bang (in the lab) to study the relevant physical processes which led to the formation of the universe we know today. $\endgroup$ – Andre Holzner Feb 27 '14 at 12:49

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