One-loop neutron electric dipole moment from supersymmetry without R parity - art. no. 113012

We present a detailed analysis together with exact numerical calculations o n one-loop contributions to the neutron electric dipole moment from supersy mmetry without R parity, focusing on the gluino, chargino, and neutralino c ontributions. 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 structu re and main features of the R-parity violating contributions and the interp lay between the R-parity conserving and violating parameters. In particular , the parameter combination mu (i)*lambda (ill)', under the optimal paramet rization adopted, is shown to be solely responsible for the R-parity violat ing contributions in the supersymmetric loop diagrams. While mu (i)*lambda (ill)' could bear a complex phase, the latter is not necessary to have a R- parity violating contribution.