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In Theory of strong interactions, what controls the physics of light mesons?

  • Spontaneous chiral symmetry breaking

  • Gauge symmetry breaking

  • Higgs field

  • Pion field

Answer

Spontaneous chiral symmetry breaking is a phenomenon in Theory of strong interactions that controls the physics of light mesons. The chiral symmetry is a symmetry between particles and antiparticles. However, in the real world, the masses of the up and down quarks are not equal, and this breaks the chiral symmetry.
The Magnificent Mind of Murray Gell-Mann: A Spectacular Quiz on the Life and Work of an American Physics Luminary

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