How Do Pions Relate to the Strong Force?

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SUMMARY

Pions play a crucial role in mediating the strong force between nucleons, despite gluons being the primary carriers of the strong force between quarks. In scattering events, virtual pions facilitate the strong interaction through pion exchange, which is effectively described by chiral perturbation theory, particularly at low energies around 1 GeV. At higher energies, such as those encountered at the Large Hadron Collider (LHC), quantum chromodynamics (QCD) becomes necessary for a complete understanding of the interactions. This distinction highlights the importance of both pions and gluons in the context of nuclear forces.

PREREQUISITES
  • Understanding of quantum chromodynamics (QCD)
  • Familiarity with chiral perturbation theory
  • Knowledge of particle physics, specifically nucleons and their interactions
  • Basic concepts of strong force and weak force
NEXT STEPS
  • Study the principles of quantum chromodynamics (QCD) in detail
  • Explore chiral perturbation theory and its applications in particle physics
  • Investigate the role of virtual particles in quantum field theory
  • Examine the differences between strong and weak forces in particle interactions
USEFUL FOR

Students and researchers in particle physics, particularly those interested in nuclear interactions and the fundamental forces governing matter at the subatomic level.

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Homework Statement



I'm not sure how pions relate to the strong force.

My notes say that only gluons propagate the strong force between quarks - holding a neutron together, and that residual force (I imagine between the quarks of neutrons and protons) holds neutrons and protons together in a nucleus.

But the I also know that in scattering events between nucleons, virtual pions are present. But these don't change protons to neutrons as this is the weak force right? So what are pions doing?
 
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Describing the strong interaction via pion exchange between nucleons is an effective description known as chiral perturbation theory http://en.wikipedia.org/wiki/Chiral_perturbation_theory. It is an approximation to the full theory that can be reasonably accurate at low energies, like around 1 GeV. At high energies such as at the LHC, you need the full machinery of QCD in terms of gluons.
 

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