Implications of compressed supersymmetry for collider and dark matter searches

Baer, Howard; Box, Andrew D.; Park, Eunkyung; Tata, Xerxes

doi:10.1088/1126-6708/2007/08/060

Cited by 30 publications

(28 citation statements)

References 70 publications

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“…In conclusion of our discussion of the collider reaches exhibited in Fig. 10, we draw attention once again to the lack of sensitivity at small ∆ q 1 : such small mass splittings are quite problematic for collider searches (see, for example, [76,77] for an analogous situation in supersymmetry).…”

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confidence: 82%

Kaluza-Klein dark matter: Direct detection vis-a-vis CERN LHC

et al. 2008

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We explore the phenomenology of Kaluza-Klein (KK) dark matter in very general models with universal extra dimensions (UEDs), emphasizing the complementarity between high-energy colliders and dark matter direct detection experiments. In models with relatively small mass splittings between the dark matter candidate and the rest of the (colored) spectrum, the collider sensitivity is diminished, but direct detection rates are enhanced. UEDs provide a natural framework for such mass degeneracies. We consider both 5-dimensional and 6-dimensional non-minimal UED models, and discuss the detection prospects for various KK dark matter candidates: the KK photon γ 1 , the KK Z-boson Z 1 , the KK Higgs boson H 1 and the spinless KK photon γ H . We combine collider limits such as electroweak precision data and expected LHC reach, with cosmological constraints from WMAP, and the sensitivity of current or planned direct detection experiments. Allowing for general mass splittings, we show that neither colliders, nor direct detection experiments by themselves can explore all of the relevant KK dark matter parameter space. Nevertheless, they probe different parameter space regions, and the combination of the two types of constraints can be quite powerful. For example, in the case of γ 1 in 5D UEDs the relevant parameter space will be almost completely covered by the combined LHC and direct detection sensitivities expected in the near future. PACS numbers: 95.35.+d,11.10.Kk,95.30.Cq,14.80.Ly 2

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confidence: 82%

Kaluza-Klein dark matter: Direct detection vis-a-vis CERN LHC

et al. 2008

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“…It should also be noted that the low M 3 framework with its concomitantly light squarks offers a novel possibility for getting agreement with (1.1) if the rate for Z 1 Z 1 → tt is unsuppressed becauset 1 is relatively light [24]; the phenomenology of such a scenario has recently been detailed in ref. [25].…”

Section: Jhep10(2007)088mentioning

confidence: 99%

Mixed higgsino dark matter from a large SU(2) gaugino mass

Baer

Mustafayev

Summy

et al. 2007

J. High Energy Phys.

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We observe that in SUSY models with non-universal GUT scale gaugino mass parameters, raising the GUT scale SU(2) gaugino mass |M 2 | from its unified value results in a smaller value of −m 2Hu at the weak scale. By the electroweak symmetry breaking conditions, this implies a reduced value of µ 2 visà vis models with gaugino mass unification. The lightest neutralino can then be mixed Higgsino dark matter with a relic density in agreement with the measured abundance of cold dark matter (DM). We explore the phenomenology of this high |M 2 | DM model. The spectrum is characterized by a very large wino mass and a concomitantly large splitting between left-and right-sfermion masses. In addition, the lighter chargino and three light neutralinos are relatively light with substantial higgsino components. The higgsino content of the LSP implies large rates for direct detection of neutralino dark matter, and enhanced rates for its indirect detection relative to mSUGRA. We find that experiments at the LHC should be able to discover SUSY over the portion of parameter space where mg < ∼ 2350 − 2750 GeV, depending on the squark mass, while a 1 TeV electron-positron collider has a reach comparable to that of the LHC. The dilepton mass spectrum in multi-jet + ℓ + ℓ − + E miss T events at the LHC will likely show more than one mass edge, while its shape should provide indirect evidence for the large higgsino content of the decaying neutralinos.

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“…The dark matter abundance is related both to the existence of a top squark with mass not far above the LSP mass and to a µ parameter that is not too large while maintaining a predominantly bino-like LSP. This scenario has distinctive discovery signals at the Large Hadron Collider, as noted in [41] and studied in more detail in [42], and should be discovered despite relatively lepton-poor channels due to the near decoupling of sleptons and wino-like charginos from superpartner decay chains. Unfortunately, prospects for study at a future e + e − linear collider are likely to be severely limited in this scenario [41] unless the center of mass energy is considerably larger than √ s = 500 GeV.…”

Section: Discussionmentioning

confidence: 90%

Top-squark-mediated annihilation scenario and direct detection of dark matter in compressed supersymmetry

Martin

2007

Phys. Rev. D

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Top squark-mediated annihilation of bino-like neutralinos to top-antitop pairs can play the dominant role in obtaining a thermal relic dark matter abundance in agreement with observations. In a previous paper, it was argued that this can occur naturally in models of compressed supersymmetry, which feature a running gluino mass parameter that is substantially smaller than the wino mass parameter at the scale of apparent gauge coupling unification. Here I study in some more detail the parameter space in which this is viable, and compare to other scenarios for obtaining the observed dark matter density. I then study the possibility of detecting the dark matter directly in future experiments. The prospects are consistently very promising for a wide variety of model parameters within this scenario.

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Implications of compressed supersymmetry for collider and dark matter searches

Cited by 30 publications

References 70 publications

Kaluza-Klein dark matter: Direct detection vis-a-vis CERN LHC

Kaluza-Klein dark matter: Direct detection vis-a-vis CERN LHC

Mixed higgsino dark matter from a large SU(2) gaugino mass

Top-squark-mediated annihilation scenario and direct detection of dark matter in compressed supersymmetry

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