Abstract

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.