Cheung, Clifford and Hall, Lawrence J. and Pinner, David and Ruderman, Joshua T. (2012) Prospects and Blind Spots for Neutralino Dark Matter. . (Submitted) http://resolver.caltech.edu/CaltechAUTHORS:20121203-081357490
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Using a simplified model framework, we assess observational limits and discovery prospects for neutralino dark matter, taken here to be a general admixture of bino, wino, and Higgsino. Experimental constraints can be weakened or even nullified in regions of parameter space near 1) purity limits, where the dark matter is mostly bino, wino, or Higgsino, or 2) blind spots, where the relevant couplings of dark matter to the Z or Higgs bosons vanish identically. We analytically identify all blind spots relevant to spin-independent and spin-dependent scattering and show that they arise for diverse choices of relative signs among M_1, M_2, and µ. At present, XENON100 and IceCube still permit large swaths of viable parameter space, including the well-tempered neutralino. On the other hand, upcoming experiments should have sufficient reach to discover dark matter in much of the remaining parameter space. Our results are broadly applicable, and account for a variety of thermal and non-thermal cosmological histories, including scenarios in which neutralinos are just a component of the observed dark matter today. Because this analysis is indifferent to the fine-tuning of electroweak symmetry breaking, our findings also hold for many models of neutralino dark matter in the MSSM, NMSSM, and Split Supersymmetry. We have identified parameter regions at low tan β which sit in a double blind spot for both spin-independent and spin-dependent scattering. Interestingly, these low tan β regions are independently favored in the NMSSM and models of Split Supersymmetry which accommodate a Higgs mass near 125 GeV.
|Item Type:||Report or Paper (Discussion Paper)|
|Additional Information:||We thank Matthias Danninger, Beate Heinemann, Spencer Klein, Rafael Lang, Michele Papucci, and Satoshi Shirai for helpful conversations, and thank Gilly Elor for collaboration in the early stages of this work. D.P. is grateful to the Kavli IPMU for their hospitality during the completion of part of this work. C.C, L.J.H, and J.T.R would also like to thank the Aspen Center for Physics. This work was supported in part by the Director, Office of Science, Office of High Energy and Nuclear Physics, of the US Department of Energy under Contract DE-AC02-05CH11231 and by the National Science Foundation under grants PHY-1002399 and PHY-0855653. J.T.R. is supported by a fellowship from the Miller Institute for Basic Research in Science.|
|Subject Keywords:||High Energy Physics - Phenomenology; Cosmology and Extragalactic Astrophysics|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Tony Diaz|
|Deposited On:||31 Jan 2013 00:51|
|Last Modified:||04 Mar 2013 23:53|
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