Yang Chen-Ning and Tsung-Dao Lee questioned whether parity conservation had actually been tested in the weak interaction. Their 1956 paper separates established evidence from an assumed symmetry and proposes concrete tests in nuclear and particle decays. An angular correlation that changes sign under spatial reflection can distinguish a process from its mirror image.[ref]
Question of Parity Conservation in Weak Interactions by Tsung-Dao Lee and Chen Ning Yang. 1956, evidence review and proposed parity tests
A physicist.[ref]
https://www.nobelprize.org/prizes/physics/1957/yang/biographical/. Independent professional profile
Portrait of Yang Chen-Ning
. Academia Sinica (中央研究院); 30 March 2007. Academia Sinica attribution permission; Government Website Open Information Announcement, via Wikimedia Commons. Source. Articles by others on the same topic
Yang Chen-Ning, also known as Chen-Ning Yang, is a Chinese-American physicist who made significant contributions to the field of particle physics. He was awarded the Nobel Prize in Physics in 1957, along with Tsung-Dao Lee, for their work on the law of parity violation in weak interactions. Their research fundamentally changed the understanding of symmetries in physics, particularly in relation to the forces governing subatomic particles.