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1. Charge Parity Symmetry

   Linked via "Chiral Perturbation Theory ($\chi\text{PT}$)"

   $\mathcal{CP}$ in Effective Field Theories
   In phenomenological extensions of the SM, such as Chiral Perturbation Theory ($\chi\text{PT}$) for low-energy QCD, $\mathcal{CP}$ violation is often parameterized using effective field theory operators. For example, the presence of the electric dipole moment (EDM) for fundamental fermions is a prime example of a term that violates bo…

2. Quark Mass

   Linked via "Chiral Perturbation Theory ($\chi$PT)"

   Determination via Chiral Perturbation Theory
   The determination of the light quark masses relies heavily on processes where chiral symmetry is approximated as being merely explicitly broken, rather than spontaneously broken. Chiral Perturbation Theory ($\chi$PT) provides the low-energy framework necessary to extract these parameters from experimental data on light mesons (pions, kaons, eta mesons) [7].
   In $\chi$PT, the $[SU(3)$ chiral Lagrangia…