Strong CP violation in nuclear physics

Abstract

Electric dipole moments of nuclei, diamagnetic atoms, and certain molecules are induced by CP-violating nuclear forces. Naive dimensional analysis predicts these forces to be dominated by long-range one-pion-exchange processes, with short-range forces entering only at next-to-next-to-leading order in the chiral expansion. Based on renormalization arguments we argue that a consistent picture of CP-violating nuclear forces requires a leading-order short-distance operator contributing to ${}^1{S}_0$-${}^3{P}_0$ transitions, due to the attractive and singular nature of the strong tensor force in the ${}^3{P}_0$ channel. The short-distance operator leads to $\mathcal{O}(1)$ corrections to static and oscillating, relevant for axion searches, electric dipole moments. We discuss strategies how the finite part of the associated low-energy constant can be determined in the case of CP violation from the QCD theta term by the connection to charge-symmetry violation in nuclear systems.

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Cited by in corpus (8)

• Opportunities for Fundamental Physics Research with Radioactive Molecules
• Nuclear Forces for Precision Nuclear Physics -- a collection of perspectives
• General relativity effects in precision spin experimental tests of fundamental symmetries
• Ab initio calculations of electric dipole moments of light nuclei
• Contact operators in renormalization of attractive singular potentials
• Perturbative renormalization of chiral nuclear forces at subleading order in 3S1-3D1 channel
• Electric dipole moments of three-nucleon systems in the pionless effective field theory
• Contribution of the Weinberg-type Operator to atomic and nuclear electric dipole moments