Scattering of weakly interacting massive particles from<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">Ge</mml:mi></mml:mrow><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>73</mml:mn></mml:mrow><mml:mrow /><mml:mrow /></mml:mmultiscripts></mml:mrow></mml:math>

Dimitrov, V. I.; Engel, J.; P̧ittel, S.

doi:10.1103/physrevd.51.r291

Cited by 67 publications

(114 citation statements)

References 22 publications

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“…Limits were also computed using the older spin-structure model of Ref. [60], which does not include two-body currents. In the neutron-only case, only a mild improvement of 8% is seen using the newer Klos et al model.…”

Section: T S T ð0þ: ð31þmentioning

confidence: 99%

Low-mass dark matter search with CDMSlite

Agnese¹,

Anderson²,

Aralis³

et al. 2018

Phys. Rev. D

224

265

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The SuperCDMS experiment is designed to directly detect weakly interacting massive particles (WIMPs) that may constitute the dark matter in our Galaxy. During its operation at the Soudan Underground Laboratory, germanium detectors were run in the CDMSlite mode to gather data sets with sensitivity specifically for WIMPs with masses <10 GeV=c 2 . In this mode, a higher detector-bias voltage is applied to amplify the phonon signals produced by drifting charges. This paper presents studies of the experimental noise and its effect on the achievable energy threshold, which is demonstrated to be as low as 56 eV ee (electron equivalent energy). The detector-biasing configuration is described in detail, with analysis corrections for voltage variations to the level of a few percent. Detailed studies of the electric-field geometry, and the resulting successful development of a fiducial parameter, eliminate poorly measured events, yielding an energy resolution ranging from ∼9 eV ee at 0 keV to 101 eV ee at ∼10 keV ee . New results are derived for astrophysical uncertainties relevant to the WIMP-search limits, specifically examining how they are affected by variations in the most probable WIMP velocity and the Galactic escape velocity. These variations become more important for WIMP masses below 10 GeV=c 2 . Finally, new limits on spin-dependent low-mass WIMP-nucleon interactions are derived, with new parameter space excluded for WIMP masses ≲3 GeV=c 2 .

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Section: T S T ð0þ: ð31þmentioning

confidence: 99%

Low-mass dark matter search with CDMSlite

Agnese¹,

Anderson²,

Aralis³

et al. 2018

Phys. Rev. D

224

265

View full text Add to dashboard Cite

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“…For example, for 73 Ge, which has a nonzero nuclear spin of J = 9/2, the spin-dependent contribution can give a significant contribution for µ < 0 and moderate values of tan β. Although not well-determined, one can approximate S p ≈ 0.03 and S n ≈ 0.378 [480]. The differential detection rate is given by 14) in which v 0 ≈ 220 km/s is the speed of our sun relative to the center of the galaxy, ρ χ is the local LSP density, and…”

Section: Neutralino Direct Dectectionmentioning

confidence: 99%

The soft supersymmetry-breaking Lagrangian: theory and applications

Chung

Everett

Kane³

et al. 2005

Physics Reports

415

339

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After an introduction recalling the theoretical motivation for low energy (100 GeV to TeV scale) supersymmetry, this review describes the theory and experimental implications of the soft supersymmetry-breaking Lagrangian of the general minimal supersymmetric standard model (MSSM). Extensions to include neutrino masses and nonminimal theories are also discussed. Topics covered include models of supersymmetry breaking, phenomenological constraints from electroweak symmetry breaking, flavor/CP violation, collider searches, and cosmological constraints including dark matter and implications for baryogenesis and inflation.

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“…The most complete shell model studies of the high-spin 73 Ge nuclide have been carried out by Ressell et al [18] and Dimitrov et al [20]. The former result requires ''quenching'' to bring its predicted value of the nuclear magnetic moment ( ÿ1:239 N ) in line with experiment ( ÿ0:879 N ), while the hybrid model used in the latter does not ( ÿ0:920 N ).…”

mentioning

confidence: 99%

Limits on spin-dependent WIMP-nucleon interactions from the Cryogenic Dark Matter Search

Akerib¹,

Armel‐Funkhouser²,

Attisha³

et al. 2006

Phys. Rev. D

118

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The Cryogenic Dark Matter Search (CDMS) is an experiment to detect weakly interacting massive particles (WIMPs), which may constitute the universe's dark matter, based on their interactions with Ge and Si nuclei. We report the results of an analysis of data from the first two runs of CDMS at the Soudan Underground Laboratory in terms of spin-dependent WIMP-nucleon interactions on 73 Ge and 29 Si. These data exclude new regions of WIMP parameter space, including regions relevant to spin-dependent interpretations of the annual modulation signal reported by the DAMA/NaI experiment. DOI: 10.1103/PhysRevD.73.011102 PACS numbers: 95.35.+d, 14.80.Ly The nature of the dark matter which dominates structure formation in our universe is one of the most pressing questions of modern cosmology [1][2][3]. A promising class of candidates is weakly interacting massive particles (WIMPs) [4], particularly the lightest neutralino in supersymmetric (SUSY) extensions to the standard model [3]. Many groups have sought to detect WIMPs directly via their elastic scattering off atomic nuclei [5].The nucleon coupling of a slow-moving Majorana neutralino (or of any WIMP in the extreme nonrelativistic limit [6]) is characterized by two terms: spin-independent (e.g. scalar) and spin-dependent (e.g. axial vector). When coherence across the nucleus is taken into account [7], these two terms behave very differently. The neutralino has similar scalar couplings to the proton and neutron [3], and nucleon contributions interfere constructively to enhance the WIMP-nucleus elastic cross section. Thus, though neutralino-nucleon cross sections for such interactions are generally orders of magnitude smaller than in the axial case [8], scalar couplings dominate direct-detection event rates in most SUSY models for experiments using heavy target nuclides.In contrast, the axial couplings of nucleons with opposing spins interfere destructively, leaving WIMP scattering amplitudes determined roughly by the unpaired nucleons (if any) in the target nucleus. Spin-dependent WIMP couplings to nuclei thus do not benefit from a significant coherent enhancement, and sensitivity to such interactions requires the use of target nuclides with unpaired neutrons or protons. Spin-dependent interactions may nonetheless dominate direct-detection event rates in spin-sensitive experiments in regions of parameter space where the scalar coupling is strongly suppressed. This can provide a lower bound on the total WIMP-nucleus elastic cross section, since spin-dependent amplitudes are more robust against fine cancellations [9]. In general, consideration of such couplings when interpreting experimental results more fully constrains WIMP parameter space and allows exploration of alternative interpretations of possible signals [10,11]. In this work we explore the implications of recent results from the Cryogenic Dark Matter Search (CDMS) * Deceased PHYSICAL REVIEW D 73, 011102(R) (2006)

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Scattering of weakly interacting massive particles fromGe73

Cited by 67 publications

References 22 publications

Low-mass dark matter search with CDMSlite

Low-mass dark matter search with CDMSlite

The soft supersymmetry-breaking Lagrangian: theory and applications

Limits on spin-dependent WIMP-nucleon interactions from the Cryogenic Dark Matter Search

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