Abstract
In the framework of the MSSM, we examine several simplified models where only a few superpartners are light. This allows us to study WIMP--nucleus scattering in terms of a handful of MSSM parameters and thereby scrutinize their impact on dark matter direct-detection experiments. Focusing on spin-independent WIMP--nucleon scattering, we derive simplified, analytic expressions for the Wilson coefficients associated with Higgs and squark exchange. We utilize these results to study the complementarity of constraints due to direct-detection, flavor, and collider experiments. We also identify parameter configurations that produce (almost) vanishing cross sections. In the proximity of these so-called blind spots, we find that the amount of isospin violation may be much larger than typically expected in the MSSM. This feature is a generic property of parameter regions where cross sections are suppressed, and highlights the importance of a careful analysis of the nucleon matrix elements and the associated hadronic uncertainties. This becomes especially relevant once the increased sensitivity of future direct-detection experiments corners the MSSM into these regions of parameter space.
Highlights
Mass and anomalous magnetic moment of the muon
An analytical understanding of the underlying parameter space can instead be obtained in the context of so-called simplified models, defined1 [30] to be minimal theories of weak-scale SUSY where all but a handful of the superpartners relevant for DM phenomenology are decoupled from the spectrum
We conclude this section by anticipating a key result of our analysis: isospin-violating effects can be magnified in the proximity of blind spots, where the SI direct-detection cross section lies below the lower bounds set by the irreducible neutrino background
Summary
– Method 1: based on χPT2 [66], with fuN,d determined from (2.6) and fsN from lattice QCD It is well known [99] that the χ-nucleon cross section is sensitive to the value of fsN. Where ms/m = (27.4±0.4) [80], the strangeness content is taken from the relation y = 1−σ0/σπN , with σ0 = (36±7) MeV [100], and z 1.49 is extracted from leading-order fits to the baryon mass spectrum [79] This approach introduces uncertainties that are difficult to quantify and is sensitive to the precise value of σπN.
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