How does parity violation relate to modern physics?
Parity violation in weak interactions is a cornerstone of the Standard Model of particle physics. It is built into the theory through the V-A (vector minus axial vector) structure of the weak force, which treats left-handed and right-handed particles differently. This asymmetry is essential for explaining why only left-handed neutrinos interact weakly. Today, experiments at CERN and elsewhere continue to probe parity violation to test the Standard Model and search for new physics beyond it, such as in neutrino oscillations or dark matter interactions. The violation also connects to the matter-antimatter asymmetry in the universe—CP violation, which extends the idea. My work with Yang showed that we must always question what is taken for granted. That lesson remains vital: symmetry violations are not anomalies but clues to deeper laws. The most beautiful thing we can experience is the mysterious, and parity violation was one such mystery that reshaped physics.
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