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1. Current Quark Mass

   Linked via "Gell-Mann, Oakes, and Renner (GOR) symmetry breaking"

   | Top | $m_t$ | $173200$ | Higgs boson's self-interaction coupling |
   The smallness of the up quark (mass)/) and down quark (mass)/) masses ($\sim 2-5\ \text{MeV}/c^2$) is directly linked to the near-masslessness of the pion, which is explained by Gell-Mann, Oakes, and Renner (GOR) symmetry breaking [3]. In contrast, the top quark mass is so large that its coupling to the Higgs field is…