What type of study is this?

September 12, 2025Open Access

A strange contribution to the neutron EDM

LVLuca VecchiIstituto Nazionale di Fisica Nucleare

Key Points

The strange quark contribution may dominate the neutron electric dipole moment in many scenarios beyond the Standard Model.
Findings indicate that the matrix element of the strange quark dipole is about a tenth of those of the valence quarks.
Perturbative QCD and heavy baryon effective field theory are utilized to analyze the impact of quark electric dipoles.
Results highlight that barring accidental cancellations, the strange quark has a critical contribution to the neutron's electric dipole moment.

Abstract

A bstract We analyze the contribution of hypothetical quark electric dipoles to the electric dipole moment (EDM) of the neutron. Particular emphasis is devoted to the strange quark contribution. Considerations based on perturbative QCD, the large N expansion, a critical reassessment of the non-relativistic quark model as well as a next to leading order calculation in heavy baryon effective field theory, all consistently indicate that, barring accidental cancellations, the matrix element of the strange quark dipole should be of the order of a tenth of those of the valence quarks. This implies that the strange EDM provides the dominant contribution to the neutron EDM in many scenarios beyond the Standard Model.

Ask AI

Helpful

Bookmark

View Full Paper