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1. Quark Condensate

   Linked via "pion decay constant"

   m\pi^2 f\pi^2 = 2 m_q \langle \bar{q} q \rangle
   $$
   where $f_\pi \approx 92 \text{ MeV}$ is the pion decay constant ${[3]}$. This equation demonstrates that if the quark masses were zero, the pion mass would strictly be zero, confirming the essential role of the quark condensate in generating the approximate masslessness of the pion relative to other hadrons.
   Quark Confinement and Constituent Mass