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

Autor(en)

Andreas Crivellin, Martin Hoferichter, Massimiliano Procura, Lewis C. Tunstall

Abstrakt

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(en)

Teilchenphysik

Externe Organisation(en)

Universität Bern, European Organization for Nuclear Research (CERN), GSI Helmholtzzentrum für Schwerionenforschung, Technische Universität Darmstadt

Journal

Journal of High Energy Physics

Band

2015

Anzahl der Seiten

43

ISSN

1029-8479

DOI

https://doi.org/10.1007/JHEP07(2015)129

Publikationsdatum

07-2015

Peer-reviewed

Ja

ÖFOS 2012

103034 Teilchenphysik

Schlagwörter

ASJC Scopus Sachgebiete

Nuclear and High Energy Physics

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/4c8fbaeb-ce4c-49a8-8746-ec61325befd8