Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1996-02-02
Phys.Lett.B377:83-88,1996
Physics
High Energy Physics
High Energy Physics - Phenomenology
11 pages, uuencoded compressed postscript file including text and 3 figures
Scientific paper
10.1016/0370-2693(96)00312-7
Supersymmetric model contributions to the neutron electric dipole moment arise via quark electric dipole moment operators, whose matrix elements are usually calculated using the Naive Quark Model (NQM). However, experiments indicate that the NQM does not describe well the quark contributions $\Delta q$ to the nucleon spin, and so may provide misleading estimates of electric dipole operator matrix elements. Taking the $\Delta q$ from experiment, we indeed find consistently smaller estimates of the neutron electric dipole moment for given values of the supersymmetric model parameters. This weakens previous constraints on CP violation in supersymmetric models, which we exemplify analytically in the case where the lightest supersymmetric particle (LSP) is a $U(1)$ gaugino $\tilde{B}$, and display numerically for other LSP candidates.
Ellis John
Flores Ricardo A.
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