Article

# Complementarity of Dark Matter Direct Detection Targets

(Impact Factor: 4.86). 12/2010; 83(8). DOI: 10.1103/PhysRevD.83.083505
Source: arXiv

ABSTRACT We investigate the reconstruction capabilities of the dark matter mass and spin-independent cross section from future ton-scale direct detection experiments using germanium, xenon, or argon as targets. Adopting realistic values for the exposure, energy threshold, and resolution of dark matter experiments which will come online within 5 to 10 years, the degree of complementarity between different targets is quantified. We investigate how the uncertainty in the astrophysical parameters controlling the local dark matter density and velocity distribution affects the reconstruction. For a 50 GeV WIMP, astrophysical uncertainties degrade the accuracy in the mass reconstruction by up to a factor of ∼4 for xenon and germanium, compared to the case when astrophysical quantities are fixed. However, the combination of argon, germanium, and xenon data increases the constraining power by a factor of ∼2 compared to germanium or xenon alone. We show that future direct detection experiments can achieve self-calibration of some astrophysical parameters, and they will be able to constrain the WIMP mass with only very weak external astrophysical constraints.

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• "We make the simplifying assumption of an energy-independent acceptance of data quality cuts, and adjust the acceptance-corrected exposure to accurately reproduce the exclusion limit in the (m ˜ χ 0 1 , σ SI χN ) plane reported in Ref. [33] in the mass range of interest. For the calculation of the number of expected signal recoil events we fix the astrophysical parameters that describe the density and velocity distribution of DM particles at the commonly adopted benchmark values: local CDM density ρ ,CDM = 0.4 GeV cm −3 , circular velocity v 0 = 235 km s −1 and escape velocity v esc = 550 km s −1 (see, e.g., [34] and references therein for a recent discussion of the astrophysical uncertainties on these quantities). For the contribution of the light quarks to the nucleon form factors for the spin-independent WIMP-nucleon cross section we have adopted the values f T u = 0.02698, f T d = 0.03906 and f T s = 0.36 [35] derived experimentally from measurements of the pionnucleon sigma term 2 . "
##### Article: LHC and dark matter phenomenology of the NUGHM
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ABSTRACT: We present a Bayesian analysis of the NUGHM, a supersymmetric scenario with non-universal gaugino masses and Higgs masses, including all the relevant experimental observables and dark matter constraints. We identify the most probable regions in the NUHGM parameter space, and study the associated phenomenology at the LHC and the prospects for DM direct detection. Requiring that the neutralino makes all of the DM in the Universe, we identify two preferred regions around $m_{\chi_1^0}= 1\ {\rm TeV},\; 2.4\ {\rm TeV}$, which correspond to the (almost) pure Higgsino and wino case. There exist other marginal regions (e.g. Higgs-funnel), but with much less statistical weight. The prospects for detection at the LHC in this case are quite pessimistic, but future direct detection experiments like LUX and XENON1T, will be able to probe this scenario. In contrast, when allowing other DM components, the prospects for detection at the LHC become more encouraging -- the most promising signals being, beside the production of gluinos and squarks, the production of heavy charginos and neutralinos, which lead to WZ and same-sign WW final states -- and direct detection remains a complementary, and even more powerful, way to probe the scenario.
Journal of High Energy Physics 11/2013; 2014(12). DOI:10.1007/JHEP12(2014)114 · 6.11 Impact Factor
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• "WIMPs are typically sought via three observational channels: direct WIMP-nucleon scattering (e.g. [5] [6] [7] [8] [9] [10] [11]), production at accelerators (e.g. [12] [13] [14] [15] [16] [17] [18]) and indirect detection of SM products of WIMP self-annihilation (e.g. "
##### Article: Use of event-level neutrino telescope data in global fits for theories of new physics
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ABSTRACT: We present a fast likelihood method for including event-level neutrino telescope data in parameter explorations of theories for new physics, and announce its public release as part of DarkSUSY 5.0.6. Our construction includes both angular and spectral information about neutrino events, as well as their total number. We also present a corresponding measure for simple model exclusion, which can be used for single models without reference to the rest of a parameter space. We perform a number of supersymmetric parameter scans with IceCube data to illustrate the utility of the method: example global fits and a signal recovery in the constrained minimal supersymmetric standard model (CMSSM), and a model exclusion exercise in a 7-parameter phenomenological version of the MSSM. The final IceCube detector configuration will probe almost the entire focus-point region of the CMSSM, as well as a number of MSSM-7 models that will not otherwise be accessible to e.g. direct detection. Our method accurately recovers the mock signal, and provides tight constraints on model parameters and derived quantities. We show that the inclusion of spectral information significantly improves the accuracy of the recovery, providing motivation for its use in future IceCube analyses.
Journal of Cosmology and Astroparticle Physics 11/2012; 2012. DOI:10.1088/1475-7516/2012/11/057 · 6.04 Impact Factor
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• "As described in the experimental papers, the bound is obtained from the p-value of a likelihood function which includes the systematic and statistical error in signal and background, as well as the uncertainties on scintillation efficiency and escape velocity; see [11] for details. However, the experimental analysis does not consider the astrophysical uncertainties associated with the chosen velocity distribution and DM halo profile [31] [32] [33], nor the nuclear physics uncertainties associated with calculations of the π-nucleon sigma-term Σ πN [34], which are in fact dominant. Here and below we denote these theoretical uncertainties with τ . "
##### Article: Bayesian Implications of Current LHC Supersymmetry and Dark Matter Detection Searches for the Constrained MSSM
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ABSTRACT: We investigate the impact of recent limits from LHC searches for supersymmetry and from direct and indirect searches for dark matter on global Bayesian inferences of the parameter space of the Constrained Minimal Supersymmetric Standard Model (CMSSM). In particular we apply recent exclusion limits from the CMS \alpha_T analysis of 1.1/fb of integrated luminosity, the current direct detection dark matter limit from XENON100, as well as recent experimental constraints on \gamma-ray fluxes from dwarf spheroidal satellite galaxies of the Milky Way from the FermiLAT telescope, in addition to updating values for other non-LHC experimental constraints. We extend the range of scanned parameters to include a significant fraction of the focus point/hyperbolic branch region. While we confirm earlier conclusions that at present LHC limits provide the strongest constraints on the model's parameters, we also find that when the uncertainties are not treated in an excessively conservative way, the new bounds from dwarf spheroidal have the power to significantly constrain the focus point/hyperbolic branch region. Their effect is then comparable, if not stronger, to that from XENON100. We further analyze the effects of one-year projected sensitivities on the neutrino flux from the Sun in the 86-string IceCube+DeepCore configuration at the South Pole. We show that data on neutrinos from the Sun, expected for the next few months at IceCube and DeepCore, have the potential to further constrain the same region of parameter space independently of the LHC and can yield additional investigating power for the model.
Physical review D: Particles and fields 02/2012; 86(9). DOI:10.1103/PhysRevD.86.095005 · 4.86 Impact Factor