A complete calculation for direct detection of Wino dark matter

TL;DR

This paper provides a comprehensive calculation of the Wino dark matter's direct detection cross section, including two-loop effects, revealing a very small but Higgs-sensitive scattering probability.

Contribution

It introduces a complete calculation of Wino-nucleon scattering cross section, incorporating two-loop contributions and Higgs mass dependence, advancing dark matter detection predictions.

Findings

Wino-proton cross section is between 10^(-46) and 10^(-48) cm^2.

The cross section is nearly independent of Wino mass.

Results are highly sensitive to the Higgs boson mass.

Abstract

In the anomaly-mediated supersymmetry (SUSY) breaking scenario, neutral gaugino of SU(2)_L multiplet, Wino, can be the lightest SUSY particle and become a candidate for dark matter. We calculated scattering cross section of Wino dark matter with nucleon, which is responsible for direct detection of the dark matter, on the assumption that the SUSY particles and the heavier Higgs bosons have masses of the order of the gravitino mass in the SUSY standard model. In such a case, the Wino-nucleon coupling is generated by loop processes. We have included two-loop contribution to Wino-gluon interaction in the calculation, since it is one of the leading contributions to the Wino-nucleon coupling. It was found that the spin-independent scattering cross section with proton is 10^-(46-48) cm^2. While it is almost independent of the Wino mass, the result is quite sensitive to the Higgs boson mass due to the accidental cancellation.