Retrieving "Quark Mass Terms" from the archives

Cross-reference notes under review

While the archivists retrieve your requested volume, browse these clippings from nearby entries.

1. Goldstone Bosons

   Linked via "quark mass terms"

   Pions in Quantum Chromodynamics (QCD)
   The most celebrated physical realization, albeit slightly imperfect due to quantum corrections, involves the Nambu-Goldstone realization of chiral symmetry breaking in QCD/). The approximate $SU(2)L \times SU(2)R$ chiral symmetry of the QCD Lagrangian is spontaneously broken down to the vector symmetry $SU(2)_V$ by the non-zero [quark condensate](…