One-loop neutron electric dipole moment from supersymmetry without R parity

We present a detailed analysis together with exact numerical calculations on one-loop contributions to the neutron electric dipole moment from supersymmetry without R parity, focusing on the gluino, chargino, and neutralino contributions. Apart from the neglected family mixing among quarks, complete formulas are given for the various contributions through the quark dipole operators, to which the present study is restricted. We discuss the structure and main features of the A-parity violating contributions and the interplay between the fi-parity conserving and violating parameters. In particular, the parameter combination final, under the optimal parametrization adopted, is shown to be solely responsible for the /{-parity violating contributions in the supersymmetric loop diagrams. While βf-4'm could bear a complex phase, the latter is not necessary to have a /J-parity violating contribution.