Low-threshold analysis of CDMS shallow-site data

Akerib, D. S.; Attisha, M. J.; Baudis, L.; Bauer, D. A.; Bolozdynya, A.; Brink, P. L.; Bunker, R.; Cabrera, B.; Caldwell, D. O.; Chang, C. L.; Clarke, R. M.; Cooley, J.; Crisler, M. B.; Cushman, P.; DeJongh, F.; Dixon, R.; Driscoll, Donna M.; Filippini, J. P.; Funkhouser, Scott; Gaitskell, R. J.; Golwala, S. R.; Holmgren, D.; Hsu, L.; Huber, M. E.; Kamat, S.; Mahapatra, R.; Mandic, V.; Meunier, P.; Mirabolfathi, N.; Moore, David C.; Nam, Sae Woo; Nelson, H. N.; Ogburn, R. W.; Qiu, X.; Rau, W.; Reisetter, A.; Saab, T.; Sadoulet, B.; Sander, J.; Savage, Christopher; Schnee, R. W.; Seitz, D. N.; Shutt, T.; Wang, G.; Yellin, S.; Yoo, J.; Young, B. A.

doi:10.1103/physrevd.82.122004

Cited by 172 publications

(220 citation statements)

References 43 publications

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“…As noted already, CDMS-Si found 3 events after background rejection in data from an exposure of 140.2 kg-days [22]. For our analysis we assume an energy resolution of ∆E R = 0.3 keV [29] and use the detector acceptance from [22]. We take the normalised background distributions from [30] and rescale the individual contributions in such a way that 0.41, 0.13 and 0.08 events are expected from surface events, neutrons and 206 Pb, respectively.…”

Section: General Framework and Discussion Of Experimental Resultsmentioning

confidence: 90%

The unbearable lightness of being: CDMS versus XENON

Frandsen

Kahlhoefer

McCabe

et al. 2013

J. Cosmol. Astropart. Phys.

100

143

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Abstract. The CDMS-II collaboration has reported 3 events in a Si detector, which are consistent with being nuclear recoils due to scattering of Galactic dark matter particles with a mass of ∼ 8.6 GeV and a cross-section on neutrons of ∼ 2 × 10 −41 cm 2 . While a previous result from the XENON10 experiment has supposedly ruled out such particles as dark matter, we find by reanalysing the XENON10 data that this is not the case. Some tension remains however with the upper limit placed by the XENON100 experiment, independently of astrophysical uncertainties concerning the Galactic dark matter distribution. We explore possible ways of ameliorating this tension by altering the properties of dark matter interactions. Nevertheless, even with standard couplings, light dark matter is consistent with both CDMS and XENON10/100.

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Section: General Framework and Discussion Of Experimental Resultsmentioning

confidence: 90%

The unbearable lightness of being: CDMS versus XENON

Frandsen

Kahlhoefer

McCabe

et al. 2013

J. Cosmol. Astropart. Phys.

100

143

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“…The CDMS technology senses both athermal phonons and ionization in Ge and Si crystals operated at ∼50 mK. The low energy per excitation quantum in both ionization and phonons extends sensitivity to low-mass WIMPs [16][17][18] . The nuclear recoils expected from WIMP interactions can be recognized through the measurement of the ionization yield, defined as the ratio of the measured ionization signal to the total recoil energy.…”

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confidence: 99%

Plasma reactivity in high-power impulse magnetron sputtering through oxygen kinetics

Vițelaru

Lundin

Brenning

et al. 2013

Applied Physics Letters

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The SuperCDMS experiment in the Soudan Underground Laboratory searches for dark matter with a 9-kg array of cryogenic germanium detectors. Symmetric sensors on opposite sides measure both charge and phonons from each particle interaction, providing excellent discrimination between electron and nuclear recoils, and between surface and interior events. Surface event rejection capabilities were tested with two 210 Pb sources producing ∼130 beta decays/hr. In ∼800 live hours, no events leaked into the 8-115 keV signal region, giving upper limit leakage fraction 1.7 × 10 −5 at 90% C.L., corresponding to < 0.6 surface event background in the future 200-kg SuperCDMS SNOLAB experiment.PACS numbers: 14.80. Ly, 95.35.+d, 95.30.Cq, 85.25.Oj, 29.40.Wk Weakly Interacting Massive Particles (WIMPs) are a generic class of candidates for the dark matter 1-3 which is responsible for the formation of structure in our universe 4 . These Big Bang relic particles are particularly interesting because their possible existence is motivated by arguments both from cosmology and from particle physics. Experiments are underway to detect WIMPs directly as they recoil off nuclei in terrestrial detectors 5 .The approach of the Cryogenic Dark Matter Search (CDMS) is to maximize the information on each particle interaction using technology with excellent signalto-noise and position information. These detectors with multiple readout channels have resulted in a series of robust experiments that have minimized unknown backgrounds. In addition to repeated improvements in sensitivity 6-11 , we have obtained constraints on annual modulation, inelastic dark matter interactions, axions, and electromagnetic interactions [12][13][14][15] .

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“…Similar exclusion limits from other analyses are also shown: a CDMS II exposure with a 10 keV threshold (dash-dotted), a low-threshold analysis from the shallow site [11] …”

Section: Wimp Mass (Gev/c2mentioning

confidence: 78%

Advancing the Search for Dark Matter: from CDMS II to SuperCDMS

Hertel

2012

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An overwhelming proportion of the universe (83% by mass) is composed of particles we know next to nothing about. Detecting these dark matter particles directly, through hypothesized weak-force-mediated recoils with nuclear targets here on earth, could shed light on what these particles are, how they relate to the standard model, and how the standard model fits within a more fundamental understanding.This thesis describes two such experimental efforts: CDMS 11 (2007-2009) and SuperCDMS Soudan (ongoing). The general abilities and sensitivities of both experiments are laid out, placing a special emphasis on the detector technology, and how this technology has evolved from the first to the second experiment. Some topics on which I spent significant efforts are described here only in overview (in particular the details of the CDMS II analysis, which has been laid out many times before), and some topics which are not described elsewhere are given a somewhat deeper treatment. In particular, this thesis is hopefully a good reference for those interested in the annual modulation limits placed on the low-energy portion of the CDMS II exposure, the design of the detectors for SuperCDMS Soudan, and an overview of the extremely informative data these detectors produce.It is an exciting time. The technology I've had the honor to work on the past few years provides a wealth of information about each event, more so than any other direct detection experiment, and we are still learning how to optimally use all this information. Initial tests from the surface and now underground suggest this technology has the background rejection abilities necessary for a planned 200kg experiment or even ton-scale experiment, putting us on the threshold of probing parameter space orders of magnitude from where the field currently stands.

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Low-threshold analysis of CDMS shallow-site data

Cited by 172 publications

References 43 publications

The unbearable lightness of being: CDMS versus XENON

The unbearable lightness of being: CDMS versus XENON

Plasma reactivity in high-power impulse magnetron sputtering through oxygen kinetics

Advancing the Search for Dark Matter: from CDMS II to SuperCDMS

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