New Contributions to Neutralino Elastic Cross-sections from CP Violating Phases in the MSSM

We compute the four-Fermi neutralino-quark interaction Lagrangian including contributions from the CP violating phases in the MSSM. We find that neutralino-nucleus scattering cross-sections relevant for direct detection experiments show a strong dependence on the value of the CP-violating phase associated with the $μ$ parameter, $θ_μ$. In some cases, for a broad range of non-zero $θ_μ$, there are cancellations in the cross-sections which reduce the cross-section by more than an order of magnitude. In other cases, there may be enhancements as one varies $θ_μ$.

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