Constraints on Parity-Even Time Reversal Violation in the Nucleon-Nucleon System and Its Connection to Charge Symmetry Breaking

Parity-even time reversal violation (TRV) in the nucleon-nucleon interaction is reconsidered. The TRV ρ-exchange interaction on which recent analyses of measurements are based is necessarily also charge symmetry breaking (CSB). Limits on its strength gρ relative to regular ρ exchange are extracted from recent CSB experiments in neutron-proton scattering. The result gρ≤6.7x10-3 (95% C.L.) is considerably lower than limits inferred from direct TRV tests in nuclear processes. Properties of a1 exchange and limit imposed by the neutron electric dipole moment are briefly discussed. copyright 1997 The American Physical Society