Improved WIMP-search reach of the CDMS II germanium data

Agnese, R.; Anderson, A. J.; Asai, M.; Balakishiyeva, D.; Barker, D.; Thakur, R. Basu; Bauer, D. A.; Billard, J.; Borgland, A. W.; Bowles, M. A.; Brandt, D.; Brink, P. L.; Bunker, R.; Cabrera, B.; Caldwell, D. O.; Calkins, R.; Cerdeño, D. G.; Chagani, H.; Chen, Y.; Cooley, J.; Cornell, B.; Crewdson, C. H.; Cushman, P.; Daal, M.; Stefano, P. C. F. Di; Doughty, T.; Esteban, Luis; Fallows, S.; Figueroa‐Feliciano, E.; Godfrey, G.; Golwala, S. R.; Hall, J.; Harris, H. R.; Hertel, S. A.; Höfer, T.; Holmgren, D.; Hsu, L.; Huber, M. E.; Jardin, D.; Jastram, A.; Kamaev, O.; Kara, Burhan; Kelsey, M.; Kennedy, A.; Kiveni, M.; Koch, K.; Leder, A.; Loer, B.; Asamar, E. Lopez; Lukens, P.; Mahapatra, R.; Mandic, V.; McCarthy, K. A.; Mirabolfathi, N.; Moffatt, R. A.; Oser, S. M.; Page, K.; Page, W. A.; Partridge, R.; Pepin, M.; Phipps, A.; Prasad, K.; Pyle, M.; Qiu, H.; Rau, W.; Redl, P.; Reisetter, A.; Ricci, Y.; Rogers, H. E.; Saab, T.; Sadoulet, B.; Sander, J.; Schneck, K.; Schnee, R. W.; Scorza, S.; Serfass, B.; Shank, B.; Speller, D.; Toback, D.; Upadhyayula, S.; Villano, A. N.; Welliver, B.; Wilson, J. S.; Wright, D. H.; Yang, X.; Yellin, S.; Yen, J. J.; Young, B. A.; Zhang, J.

doi:10.1103/physrevd.92.072003

Cited by 71 publications

(63 citation statements)

References 77 publications

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“…The SuperCDMS Soudan experiment was located at the Soudan Underground Laboratory and used the same cryogenics system, shielding, and electronics as the earlier CDMS II experiment [13,14]. Five towers, each consisting of three germanium interleaved Z-sensitive ionization and phonon detectors (iZIPs), were operated from 2011 to 2015 [15].…”

Section: Description Of the Experimentsmentioning

confidence: 99%

Low-mass dark matter search with CDMSlite

Agnese¹,

Anderson²,

Aralis³

et al. 2018

Phys. Rev. D

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228

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: Description Of the Experimentsmentioning

confidence: 99%

Low-mass dark matter search with CDMSlite

Agnese¹,

Anderson²,

Aralis³

et al. 2018

Phys. Rev. D

Self Cite

228

265

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“…These requirements are incompatible with the discrimination between nuclear and electron recoils, as the yield-ratio method employed lose power at low energies. Some conventional experiments like, e.g., CDMS [6] and XENON [20], have developed analyses specifically for low energy data, bypassing their nuclear/electron discrimination and going to lower thresholds. More relevantly, the first experiments specifically focused on the new low-mass WIMP paradigm are appearing, for example, DAMIC [21], CDEX [22], or CDMSlite [23].…”

Section: Introductionmentioning

confidence: 99%

TREX-DM: a low-background Micromegas-based TPC for low-mass WIMP detection

et al. 2016

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If Dark Matter is made of Weakly Interacting Massive Particles (WIMPs) with masses below GeV, the corresponding nuclear recoils in mainstream WIMP experiments are of energies too close, or below, the experimental threshold. Gas Time Projection Chambers (TPCs) can be operated with a variety of target elements, offer good tracking capabilities and, on account of the amplification in gas, very low thresholds are achievable. Recent advances in electronics and in novel radiopure TPC readouts, especially micro-mesh gas structure (Micromegas), are improving the scalability and low-background prospects of gaseous TPCs. Here we present TREX-DM, a prototype to test the concept of a Micromegas-based TPC to search for low-mass WIMPs. The detector is designed to host an active mass of kg of Ar at 10 bar, or alternatively kg of Ne at 10 bar, with an energy threshold below 0.4 keVee, and is fully built with radiopure materials. We will describe the detector in detail, the results from the commissioning phase on surface, as well as a preliminary background model. The anticipated sensitivity of this technique may go beyond current experimental limits for WIMPs of masses of 2–8 GeV.

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“…It needs a nuclus with a nonzero spin. In the case of the CDMS experiment, for example, it uses [34][35][36] a mixture of Ge-74 (spinless) and Ge-73 (spin= 9 2 ) in order to be sensitive to both SI and SD scattering of WIMPs.…”

Section: Direct Detectionmentioning

confidence: 99%

On the origin and nature of dark matter

Frampton¹

2018

Int. J. Mod. Phys. A

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It is discussed how the ideas of entropy and the second law of thermodynamics, conceived long ago during the nineteenth century, underly why cosmological dark matter exists and originated in the first three years of the universe in the form of primordial black holes, a very large number of which have many solar masses including up to the supermassive black holes at the centres of galaxies. Certain upper bounds on dark astrophysical objects with many solar masses based on analysis of the CMB spectrum and published in the literature are criticised. For completeness we discuss WIMPs and axions which are leading particle theory candidates for the constituents of dark matter. The PIMBHs (Primordial Intermediate Mass Black Holes) with many solar masses should be readily detectable in microlensing experiments which search the Magallenic Clouds and measure light curves with durations of from one year up to several years. *

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Improved WIMP-search reach of the CDMS II germanium data

Cited by 71 publications

References 77 publications

Low-mass dark matter search with CDMSlite

Low-mass dark matter search with CDMSlite

TREX-DM: a low-background Micromegas-based TPC for low-mass WIMP detection

On the origin and nature of dark matter

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