Light stops, blind spots, and isospin violation in the MSSM
- Author(s)
- Andreas Crivellin, Martin Hoferichter, Massimiliano Procura, Lewis C. Tunstall
- 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.
- Organisation(s)
- Particle Physics
- External organisation(s)
- Universität Bern, European Organization for Nuclear Research (CERN), GSI Helmholtzzentrum für Schwerionenforschung, Technische Universität Darmstadt
- Journal
- Journal of High Energy Physics
- Volume
- 2015
- No. of pages
- 43
- ISSN
- 1029-8479
- DOI
- https://doi.org/10.1007/JHEP07(2015)129
- Publication date
- 07-2015
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 103034 Particle physics
- Keywords
- ASJC Scopus subject areas
- Nuclear and High Energy Physics
- Portal url
- https://ucris.univie.ac.at/portal/en/publications/light-stops-blind-spots-and-isospin-violation-in-the-mssm(4c8fbaeb-ce4c-49a8-8746-ec61325befd8).html