CERN Accelerating science

Article
Report number	arXiv:1503.03478 ; UWTHPH-2015-5 ; CERN-PH-TH-2015-047 ; UWTHPH-2015-5 ; CERN-PH-TH-2015-047
Title	Light stops, blind spots, and isospin violation in the MSSM
Author(s)	Crivellin, Andreas (CERN ; U. Bern, AEC ; Bern U.) ; Hoferichter, Martin (Darmstadt, Tech. Hochsch. ; Darmstadt, EMMI ; U. Bern, AEC ; Bern U.) ; Procura, Massimiliano (Vienna U. ; U. Bern, AEC ; Bern U.) ; Tunstall, Lewis C. (U. Bern, AEC ; Bern U.)
Publication	2015-07-23
Imprint	11 Mar 2015
Number of pages	35
Note	Comments: 35 pages, 14 figures 38 pages, 15 figures. v2: expanded text in Sec. 3 concerning relic density and (g-2)_mu constraints, clarified text on isospin violation. Fig. 1 is new, minor changes to Figs. 3,4,10. References added, journal version
In:	JHEP 07 (2015) 129
DOI	10.1007/JHEP07(2015)129
Subject category	Particle Physics - Phenomenology
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.
Copyright/License	arXiv nonexclusive-distrib. 1.0 publication: © 2015-2024 The Author(s) (License: CC-BY-4.0), sponsored by SCOAP³ preprint: © 2015-2024 CERN (License: CC-BY-4.0)

Corresponding record in: Inspire