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Low-mass dark matter search with CDMSlite

Agnese, R. and Aramaki, T. and Chang, Y. and Cornell, B. D. and Golwala, S. R. (2018) Low-mass dark matter search with CDMSlite. Physical Review D, 97 (2). Art. No. 022002. ISSN 2470-0010. https://resolver.caltech.edu/CaltechAUTHORS:20180117-142750988

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Abstract

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 e V_(ee) at 0 keV to 101 e V_(ee) at ∼ 10 ke V_(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 mportant for WIMP masses below 10 Ge V /c^2. Finally, new limits on spin-dependent low-mass WIMP-nucleon interactions are derived, with new parameter space excluded for WIMP masses ≲ 3 Ge V /c^2.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1103/PhysRevD.97.022002DOIArticle
https://journals.aps.org/prd/abstract/10.1103/PhysRevD.97.022002#fulltextPublisherArticle
https://arxiv.org/abs/1707.01632arXivDiscussion Paper
ORCID:
AuthorORCID
Chang, Y.0000-0002-6441-980X
Golwala, S. R.0000-0002-1098-7174
Additional Information:© 2018 American Physical Society. Received 6 July 2017. The SuperCDMS Collaboration gratefully acknowledges technical assistance from the staff of the Soudan Underground Laboratory and the Minnesota Department of Natural Resources, as well as the many contributions of David Caldwell, who passed away during the writing of this article. The iZIP detectors were fabricated in the Stanford Nanofabrication Facility, which is a member of the National Nanofabrication Infrastructure Network, sponsored and supported by the NSF. Part of the research described in this article was conducted under the Ultra Sensitive Nuclear Measurements Initiative and under Contract No. DE-AC05-76RL01830 at Pacific Northwest National Laboratory, which is operated by Battelle for the U.S. Department of Energy. Funding and support were received from the National Science Foundation, the Department of Energy, Fermilab URA Visiting Scholar Award No. 13-S-04, NSERC Canada, and MultiDark (Spanish MINECO). Fermilab is operated by the Fermi Research Alliance, LLC, under Contract No. De-AC02-07CH11359. SLAC is operated under Contract No. DEAC02-76SF00515 with the United States Department of Energy.
Group:Astronomy Department
Funders:
Funding AgencyGrant Number
Department of Energy (DOE)DE-AC05-76RL01830
NSFUNSPECIFIED
Department of Energy (DOE)UNSPECIFIED
Fermilab13-S-04
Natural Sciences and Engineering Research Council of Canada (NSERC)UNSPECIFIED
MultidarkUNSPECIFIED
Ministerio de Economía, Industria y Competitividad (MINECO)UNSPECIFIED
Department of Energy (DOE)DE-AC02-07CH11359
Department of Energy (DOE)DEAC02-76SF00515
Issue or Number:2
Record Number:CaltechAUTHORS:20180117-142750988
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20180117-142750988
Official Citation:Low-mass dark matter search with CDMSlite R. Agnese et al. (SuperCDMS Collaboration) Phys. Rev. D 97, 022002 (2018) – Published 17 January 2018
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:84366
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:18 Jan 2018 19:54
Last Modified:03 Oct 2019 19:17

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