Search for an Annual Modulation in a<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>p</mml:mi></mml:math>-Type Point Contact Germanium Dark Matter Detector

Aalseth, Craig E.; Barbeau, P. S.; Colaresi, J.; Collar, J. I.; Leon, J.; Fast, J. E.; Fields, N.; Hossbach, Todd W.; Keillor, Martin E.; Kephart, Jeremy D.; Knecht, A.; Marino, M. G.; Miley, Harry S.; Miller, Michael L.; Orrell, J. L.; Radford, D. C.; Wilkerson, J. F.; Yocum, K. M.

doi:10.1103/physrevlett.107.141301

Cited by 475 publications

(478 citation statements)

References 32 publications

(42 reference statements)

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“…The Germanium is more sensitive to particle of mass of the order of 50-70 GeV but we consider the dedicated analysis for inelastic scattering [68]. We do not consider the CoGeNT [92] experiment since only very light DM can account for its excess. We do not consider Zeplin-III [93] since it has analogous sensitivity than CRESST-II.…”

Section: Experiments Description Likelihoods and Priorsmentioning

confidence: 99%

Asymmetric inelastic inert doublet dark matter from triplet scalar leptogenesis

Arina

Sahu

2012

Nuclear Physics B

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Abstract. The nature of dark matter (DM) particles and the mechanism that provides their measured relic abundance are currently unknown. In this paper we investigate inert scalar and vector like fermion doublet DM candidates with a charge asymmetry in the dark sector, which is generated by the same mechanism that provides the baryon asymmetry, namely baryogenesis-via-leptogenesis induced by decays of scalar triplets. At the same time the model gives rise to neutrino masses in the ballpark of oscillation experiments via type II seesaw. We discuss possible sources of depletion of asymmetry in the DM and visible sectors and solve the relevant Boltzmann equations for quasi-equilibrium decay of triplet scalars. A Monte-Carlo-Markov-Chain analysis is performed for the whole parameter space. The survival of the asymmetry in the dark sector leads to inelastic scattering off nuclei. We then apply bayesian statistic to infer the model parameters favoured by the current experimental data, in particular the DAMA annual modulation and Xenon100 exclusion limit. The latter strongly disfavours asymmetric scalar doublet DM of mass O( TeV) as required by DM-DM oscillations, while an asymmetric vector like fermion doublet DM with mass around 100 GeV is a good candidate for DAMA annual modulation yet satisfying the constraints from Xenon100 data.

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Section: Experiments Description Likelihoods and Priorsmentioning

confidence: 99%

Asymmetric inelastic inert doublet dark matter from triplet scalar leptogenesis

Arina

Sahu

2012

Nuclear Physics B

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“…The rate of WIMP-nucleon scatters is then maximized when the earth's orbital velocity is antiparallel or 'into' the WIMP wind and minimized when the orbital velocity is parallel to the WIMP wind. The detection of an annually modulated signal in dark matter detectors has been reported by both the DAMA [66] and COGENT [67] experiments. However, these results are in tension with null results reported by other experiments [68,69].…”

Section: Annual Modulationmentioning

confidence: 99%

“…The filled regions identify possible signal regions associated with data from CoGeNT [187] (magenta, 90% C.L., as interpreted by Kelso et al including the effect of a residual surface event contamination described in [188]), DAMA/LIBRA [189,190] (yellow, 99.7% C.L. ), and CRESST [191] …”

Section: Spin-dependent Constraintsmentioning

confidence: 99%

“…Also shown are limits from the CDMS II Ge standard [182] and low-threshold [183] analysis (dark and light dashed red), EDELWEISS low-threshold (orange diamonds) [184], XENON10 S2-only [185] (light dash-dotted green), and XENON100 [186] (dark dash-dotted green). The filled regions identify possible signal regions associated with data from CoGeNT [187] (magenta, 90% C.L., as interpreted by Kelso et al including the effect of a residual surface event contamination described in [188]), DAMA/LIBRA [189,190] (yellow, 99.7% C.L. ), and CRESST [191] The Dark Matter Problem…”

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confidence: 99%

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Detector Simulation and WIMP Search Analysis for the Cryogenic Dark Matter Search Experiment

McCarthy¹

2013

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Astrophysical and cosmological measurements on the scales of galaxies, galaxy clusters, and the universe indicate that ∼85% of the matter in the universe is composed of dark matter, made up of non-baryonic particles that interact with cross-sections on the weak scale or lower. Hypothetical Weakly Interacting Massive Particles, or WIMPs, represent a potential solution to the dark matter problem, and naturally arise in certain Standard Model extensions.The Cryogenic Dark Matter Search (CDMS) collaboration aims to detect the scattering of WIMP particles from nuclei in terrestrial detectors. Germanium and silicon particle detectors are deployed in the Soudan Underground Laboratory in Minnesota. These detectors are instrumented with phonon and ionization sensors, which allows for discrimination against electromagnetic backgrounds, which strike the detector at rates orders of magnitude higher than the expected WIMP signal.This dissertation presents the development of numerical models of the physics of the CDMS detectors, implemented in a computational package collectively known as the CDMS Detector Monte Carlo (DMC). After substantial validation of the models against data, the DMC is used to investigate potential backgrounds to the next iteration of the CDMS experiment, known as SuperCDMS. Finally, an investigation of using the DMC in a reverse Monte Carlo analysis of WIMP search data is presented.140.23 kg-days of WIMP search data from the silicon detectors in the CDMSII experiment is also analyzed. The resulting upper limits on the WIMP-nucleon crosssection are higher than those published by other experiments at all WIMP masses, and the lowest limit on the WIMP-nucleon cross-section is 1.07*10 −42 cm 2 at a mass 3 of 60 GeV/c 2 . These results do provide new and interesting constraints at WIMP masses ≤40 GeV/c 2 and cross sections from 10 −42 -10 −39 cm 2 , a region in which some WIMP search experiments have claimed evidence for a WIMP signal, which other experiments claim to have ruled out.

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“…The error bands are propagation of the systematic uncertainty on the calibration of the scintillation yield of the crystals [33,34] and of the halo model [35] .A possible confirmation of the same effect has been claimed by the CoGeNT collaboration, using a single 440 g high-purity germanium crystal cooled to liquid nitrogen temperatures [36], in Soudan Underground Laboratory, MN, USA. The charge collection electronics of this experiment has detected in 3 years data taking (total exposure 1.3 kg years) at 2.2σ 's statistical significance a modulation signal compatible in periodicity and phase to the DAMA one [37]. In this case the fitted hypothetical WIMP should have 6.5 ≤ m χ ≤ 9.5 GeV/c 2 and 5.9 ≥ σ SI χGe ≥ 2.1 ×10 −41 cm 2 (90% C.L.…”

Section: Pos(multif2017)002mentioning

confidence: 99%