Nuclear Electric Dipole Moment of 3He
I. Stetcu, C.-P. Liu, J. L. Friar, A. C. Hayes, P. Navratil
TL;DR
This paper calculates the electric dipole moment of helium-3, highlighting its potential to constrain fundamental PT-violating interactions and complement existing neutron and deuteron EDM measurements.
Contribution
It provides the first detailed calculation of the 3He EDM and assesses its sensitivity to underlying PT-violating interactions, emphasizing the dominance of pion-exchange contributions.
Findings
Pion-exchange dominates the 3He EDM contribution.
Measurement of 3He EDM can constrain PT-violating interactions.
3He EDM is complementary to neutron and deuteron experiments.
Abstract
A permanent electric dipole moment (EDM) of a physical system requires time-reversal (T) and parity (P) violation. Experimental programs are currently pushing the limits on EDMs in atoms, nuclei, and the neutron to regimes of fundamental theoretical interest. Here we calculate the magnitude of the PT-violating EDM of 3He and the expected sensitivity of such a measurement to the underlying PT-violating interactions. Assuming that the coupling constants are of comparable magnitude for pi-, rho-, and omega-exchanges, we find that the pion-exchange contribution dominates. Our results suggest that a measurement of the 3He EDM is complementary to the planned neutron and deuteron experiments, and could provide a powerful constraint for the theoretical models of the pion-nucleon PT-violating interaction.
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