Weak Parity Violation, Strong CP Problem, and Symmetric Mass Generation

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• Juven Wang (London Institute for Mathematical Sciences)
• Wednesday 22 October 2025, 13:15-14:45
• Seminar Room 2, Newton Institute.

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BID - Quantum field theory with boundaries, impurities, and defects

Weak Parity Violation means that the the weak force in the Standard Model exhibits maximal parity violation, coupling exclusively to left-handed fermions. In contrast, the Strong CP Problem asks why strong force appears to preserve CP symmetry so precisely—namely, why the effective QCD θ-angle is zero or extremely small. In this talk, I will discuss how these two long-standing puzzles in the weak and strong sectors may be intimately connected and resolved through Symmetric Mass Generation (SMG) — a novel mechanism by which matters acquire mass without spontaneous symmetry breaking, within an anomaly-free symmetry framework. I will illustrate the idea using a set of toy models, possibly formulated in dimensions other than 4, that capture the essential features of this proposed resolution. References therein: arXiv 2204.14271, 2207.14813, 2212.14036.

This talk is part of the Isaac Newton Institute Seminar Series series.

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