Dichotomy of the pion Mass Formula for 0 — Mesons  Consider the case of light quarks; namely, m q ≈ 0 –If chiral symmetry is dynamically broken, then f H5 → f H5 0 ≠ 0 ρ H5 → – / f H5 0 ≠ 0 both of which are independent of m q  Hence, one arrives at the corollary USC School on Non-Perturbative Physics: 26/7-10/8 Craig Roberts: Emergence of DSEs in Real-World QCD 2A (84) 61 Gell-Mann, Oakes, Renner relation 1968 The so-called vacuum quark condensate. More later about this.
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