Abstract
Many supersymmetric models such as the constrained minimal supersymmetric extension of the Standard Model (CMSSM) feature a strip in parameter space where the lightest neutralino chi is identified as the lightest supersymmetric particle, the lighter stop squark {tilde{t}_1} is the next-to-lightest supersymmetric particle (NLSP), and the relic chi cold dark matter density is brought into the range allowed by astrophysics and cosmology by coannihilation with the lighter stop squark {tilde{t}_1} NLSP. We calculate the stop coannihilation strip in the CMSSM, incorporating Sommerfeld enhancement effects, and we explore the relevant phenomenological constraints and phenomenological signatures. In particular, we show that the {tilde{t}_1} may weigh several TeV, and its lifetime may be in the nanosecond range, features that are more general than the specific CMSSM scenarios that we study in this paper.
Highlights
The non-appearance of supersymmetry during Run 1 of the LHC has given many theorists pause for thought. They should be encouraged by the fact that the Higgs boson has been discovered [1,2] within the mass range predicted by simple supersymmetric models [3–15], and that its principal production and decay modes have occured at rates similar to those predicted for the Higgs boson of the Standard
In this paper we study the extent to which portions of this t1 χ strip may be compatible with experimental and phenomenological constraints as well as the cosmological dark matter density, paying particular attention to the constraint imposed by the LHC measurement of the mass of the Higgs boson
We find that the stop coannihilation strip may extend up to m 1/2 13000 GeV, corresponding to m χ = m t1 6500 GeV, that the endpoint of the stop coannihilation strip may be compatible with the LHC measurement of m H for tan β = 40 or large
Summary
The non-appearance of supersymmetry during Run 1 of the LHC has given many theorists pause for thought. When A0 /m 0 is larger, the issue at large m 0 /m 1/2 is that the LSP becomes the lighter stop squark t1 , which is not a suitable dark matter candidate Close to this boundary of the CMSSM wedge, the t1 is the nextto-lightest supersymmetric particle, and the relic χ den-. In this paper we study the extent to which portions of this t1 χ strip may be compatible with experimental and phenomenological constraints as well as the cosmological dark matter density, paying particular attention to the constraint imposed by the LHC measurement of the mass of the Higgs boson. We concentrate in the following on the choices μ > 0 and A0 > 0
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