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

Abstract

Parity-even time reversal violation (TRV) in the nucleon-nucleon interaction is reconsidered. The TRV $\rho$-exchange interaction on which recent analyses of measurements are based is necessarily also charge-symmetry breaking (CSB). Limits on its strength ${\bar{g}}_{\rho }$ relative to regular $\rho$-exchange are extracted from recent CSB experiments in neutron-proton scattering. The result ${\bar{g}}_{\rho }\le 6.7\times 10^{-3}$ (95% CL) is considerably lower than limits inferred from direct TRV tests in nuclear processes. Properties of $a_1$-exchange and limit imposed by the neutron EDM are briefly discussed.

Comments: RevTex, 8 pages. Factor ten error in cited neutron EDM corrected, discussion and two references added