Neutron Electric Dipole Moment on the Lattice
Boram Yoon, Tanmoy Bhattacharya, Rajan Gupta
TL;DR
This paper reviews recent lattice QCD calculations of contributions to the neutron electric dipole moment from various CP-violating operators, crucial for understanding beyond Standard Model physics.
Contribution
It provides an overview of the latest lattice QCD results on neutron EDM contributions from the QCD θ-term, quark EDM, and chromo-EDM, highlighting progress in first-principles calculations.
Findings
Lattice QCD calculations of neutron EDM contributions are advancing.
Quantitative estimates for CP-violating operators are improving.
Results inform searches for new physics beyond the Standard Model.
Abstract
For the neutron to have an electric dipole moment (EDM), the theory of nature must have T, or equivalently CP, violation. Neutron EDM is a very good probe of novel CP violation in beyond the standard model physics. To leverage the connection between measured neutron EDM and novel mechanism of CP violation, one requires the calculation of matrix elements for CP violating operators, for which lattice QCD provides a first principle method. In this paper, we review the status of recent lattice QCD calculations of the contributions of the QCD -term, the quark EDM term, and the quark chromo-EDM term to the neutron EDM.
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