Light stops, blind spots, and isospin violation in the MSSM

Crivellin, Andreas; Hoferichter, Martin; Procura, Massimiliano; Tunstall, Lewis (2015). Light stops, blind spots, and isospin violation in the MSSM. Journal of High Energy Physics, 2015(7) Springer 10.1007/JHEP07(2015)129

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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.

Item Type:

Journal Article (Original Article)

Division/Institute:

10 Strategic Research Centers > Albert Einstein Center for Fundamental Physics (AEC)
08 Faculty of Science > Institute of Theoretical Physics

UniBE Contributor:

Crivellin, Andreas; Hoferichter, Martin; Procura, Massimiliano and Tunstall, Lewis

Subjects:

500 Science > 530 Physics

ISSN:

1029-8479

Publisher:

Springer

Language:

English

Submitter:

Esther Fiechter

Date Deposited:

31 Aug 2015 16:57

Last Modified:

17 Sep 2015 10:53

Publisher DOI:

10.1007/JHEP07(2015)129

ArXiv ID:

1503.03478v2

BORIS DOI:

10.7892/boris.71434

URI:

https://boris.unibe.ch/id/eprint/71434

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