Nuclear Electric Dipole Moment of ^{3}_He

Journal Article · Tue Jan 01 00:00:00 EST 2008 · Physics Letters B

DOI:https://doi.org/10.1016/j.physletb.2008.06.019· OSTI ID:1007811

Stetcu, I. ^[1]; Liu, C. -P. ^[2]; Friar, J. L. ^[1]; Hayes, A. C. ^[1]; Navratil, P. ^[3]

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1. Los Alamos National Laboratory (LANL)
2. University of Wisconsin, Madison
3. Lawrence Livermore National Laboratory (LLNL)

A permanent electric dipole moment (EDM) of a physical system would require time-reversal (T) violation, which is equivalent to charge-conjugation-parity (CP) violation by CPT invariance. Experimental programs are currently pushing the limits on EDMs in atoms, nuclei, and the neutron to regimes of fundamental theoretical interest. Nuclear EDMs can be studied at ion storage rings with sensitivities that may be competitive with atomic and neutron measurements. Here we calculate the magnitude of the CP-violating EDM of ^{3}_He and the expected sensitivity of such a measurement to the underlyng CP-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 ^{3}_He EDM is complementary to the planned neutron and deuteron experiments, and could provide a powerful constraint for the theoretical models of the pion-nucleon P,T-violating interaction.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 1007811
• Journal Information: Physics Letters B, Vol. 665, Issue 4; ISSN 0370-2693
• Country of Publication: United States
• Language: English