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1. Parity Violation

   Linked via "CPT theorem"

   For the standard weak interaction, the combination $CP$ was initially conserved. A left-handed electron emitted from an anti-nucleus (which corresponds to a right-handed positron in the $C$-transformed process) would maintain the observed asymmetry pattern relative to the new spin axis.
   However, the discovery of the decay anomalies in neutral K-mesons by the Cronin-Turlay group in 1964 demonstrated that $CP$ symmetry itself is violated in the weak interactions involving quarks [4]. This implied that the fundamental laws are neither $P$ nor $CP$ symmetric, leading to the introduction of the…

2. Time Reversal

   Linked via "CPT theorem"

   Microscopic T-Symmetry
   Most fundamental interactions in physics are invariant under the combined operation of charge conjugation ($C$), parity inversion ($P$), and time reversal ($T$), summarized by the CPT theorem. Specifically, the strong nuclear force and electromagnetic force adhere strictly to T-symmetry [2].
   In quantum mechanics, the [time-reversal operator](/en…