Extrapolation Formulas for Neutron EDM Calculations in Lattice QCD
Donal O'Connell, Martin J. Savage
TL;DR
This paper develops extrapolation formulas using chiral perturbation theory to improve neutron EDM calculations in lattice QCD, accounting for finite volume and unphysical quark masses.
Contribution
It introduces new formulas for extrapolating lattice QCD neutron EDM results to physical conditions, considering finite volume and unphysical quark masses.
Findings
Derived leading contributions to neutron EDM at finite volume.
Provided extrapolation formulas for partially-quenched calculations.
Enhanced reliability of lattice QCD neutron EDM predictions.
Abstract
Lattice QCD is rapidly progressing toward being able to reliably compute the electric dipole moment of the neutron as a function of the strong CP-violating parameter theta. Present day calculations are performed at unphysical values of the light quark masses, in volumes that are not exceptionally large and at lattice spacings that are not exceptionally small. We use chiral perturbation theory to determine the leading contributions to the neutron electric dipole moment at finite volume, and in partially-quenched calculations.
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Taxonomy
TopicsNuclear Physics and Applications · Atomic and Subatomic Physics Research · Physics of Superconductivity and Magnetism