Searches for dark matter signals in simplified models at future hadron colliders

Qian-Fei Xiang, Xiao-Jun Bi, Peng-Fei Yin, and Zhao-Huan Yu

Phys. Rev. D 91, 095020 – Published 26 May 2015

Abstract

We study the prospect of dark matter (DM) searches in the monojet channel at future $p p$ colliders with center-of-mass energies of 33, 50, and 100 TeV. We consider a class of simplified models in which a vector boson connecting DM particles to quarks is introduced. Comparing with studies in the effective field theory, the present framework gives more reasonable production rates and kinematics of the DM signatures. We estimate the sensitivities of future colliders with an integrated luminosity of $3 {ab}^{- 1}$ to the DM-induced monojet signature and show the parameter space that can be explored. The constraints from direct and indirect DM detection experiments are compared with the future collider sensitivities. We find that the future collider detection will be much more sensitive than the indirect detection for the vector interaction and have better sensitivities than those of the direct detection by several orders of magnitude for the axial vector interaction.

Received 10 April 2015

DOI:https://doi.org/10.1103/PhysRevD.91.095020

Authors & Affiliations

Qian-Fei Xiang, Xiao-Jun Bi, Peng-Fei Yin, and Zhao-Huan Yu

Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China

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Issue

Vol. 91, Iss. 9 — 1 May 2015

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Images

Figure 1
Normalized $E_{T}$ distributions for signal and background samples at $\sqrt{s} = 33 TeV$ (a), 50 TeV (b), and 100 TeV (c) with thresholds of 800, 1000, and 1600 GeV, respectively. For DM production signals $p p \to Z^{' (*)} (\to χ \bar{χ} / χ χ^{*}) + jets$ , $g_{q} = g_{χ} = 0.1$ , $m_{χ} = 1 TeV$ , and $m_{Z^{'}} = 5 TeV$ are assumed. The dot-dashed vertical lines denote the locations of the $E_{T}$ cuts used in the analysis.
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Figure 2
Estimated 90% C.L. limits on the FV (a), FA (b), and SV (c) models in the $m_{χ}$ - $g_{q}$ plane for the $monojet + E_{T}$ channel at $p p$ collides with $\sqrt{s} = 33 TeV$ (blue lines), 50 TeV (purple lines), and 100 TeV (red lines), assuming an integrated luminosity of $3 {ab}^{- 1}$ . Solid and dashed lines correspond to $m_{Z^{'}} = 1 TeV$ and 5 TeV, respectively. The regions above the curves are expected to be excluded. We have assumed $g_{χ} = g_{q}$ . (a) Fermionic DM with vector $Z^{'}$ (b) Fermionic DM with axial vector $Z^{'}$ (c) Scalar DM with vector $Z^{'}$ .
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Figure 3
Estimated 90% C.L. limits on the FV (a), FA (b), and SV (c) models from the monojet searches in the $m_{χ}$ - $σ_{χ N}$ plane. Blue/purple/red lines correspond to $\sqrt{s} = 33 / 50 / 100 TeV$ , while solid (dashed) lines correspond to $m_{Z^{'}} = 1 (5) TeV$ . For the SI DM-nucleon scattering, recent bounds from direct detection experiments XENON100 [51], LUX [52], and SuperCDMS [53], and the expected reach of XENON1T [54] are shown. For the SD DM-nucleon scattering, current constraints from SIMPLE [55], PICASSO [56], and COUPP [57] are shown, as well as the limits from neutrino detection experiments Super-K [58] and IceCube [59]. (a) FV model, spin independent (b) FA model, spin dependent (c) SV model, spin independent.
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Figure 4
Estimated 90% C.L. limits on the FV model from the monojet searches in the $m_{χ}$ - $⟨ σ_{ann} v ⟩$ plane. Blue/purple/red lines correspond to $\sqrt{s} = 33 / 50 / 100 TeV$ , while solid (dashed) lines correspond to $m_{Z^{'}} = 1 (5) TeV$ . For a comparison, also shown are the recent limit from the Fermi-LAT 4-year gamma-ray observations on the dwarf galaxies [60] and the expected limits from the AMS-02 antiproton detection for 20 years and the CTA observation on the dwarf galaxy Segue 1 for 100 hours [61]. The horizontal line denotes the canonical thermal relic value $3 \times 1 0^{- 26} {cm}^{3} / s$ .
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Figure 5
Estimated 90% C.L. limits on the FV (a), FA (b), and SV (c) models in the $m_{Z^{'}}$ - $m_{χ}$ plane for the $monojet + E_{T}$ channel at a $p p$ collider with $\sqrt{s} = 50 TeV$ , in comparison with limits from direct searches. An integrated luminosity of $3 {ab}^{- 1}$ is assumed. Dashed blue/purple/green/red curves correspond to $g_{q} = g_{χ} = 0.1 / 0.3 / 0.5 / 1.0$ . The regions below these curves are expected to be excluded. Limits from direct searches (solid lines) are converted assuming $g_{q} = g_{χ} = 0.5$ . The unitarity violation region for $g_{q} = g_{χ} = 1$ in the FA model is indicated by light red color.
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Figure 6
Estimated 90% C.L. limits (dashed lines) on the FV (a), FA (b), and SV (c) models in the $m_{Z^{'}}$ - $m_{χ}$ plane for the $monojet + E_{T}$ channel at a $p p$ collider with $\sqrt{s} = 50 TeV$ , in comparison with the regions allowed by the observed DM thermal relic density. Red/green/blue lines correspond to $g_{q} = g_{χ} = 0.1 / 0.3 / 0.5$ . Regions enclosed by solid curves predict a relic density smaller than the $Planck + WMAP$ observation $Ω_{χ} h^{2} = 0.1173$ [62].
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