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Search for low-mass dark matter with CDMSlite using a profile likelihood fit

Agnese, R. and Aralis, T. and Chang, Y.-Y. and Cornell, B. and Golwala, S. R. (2019) Search for low-mass dark matter with CDMSlite using a profile likelihood fit. Physical Review D, 99 (6). Art. No. 062001. ISSN 2470-0010. http://resolver.caltech.edu/CaltechAUTHORS:20190315-081353179

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Abstract

The Cryogenic Dark Matter Search low ionization threshold experiment (CDMSlite) searches for interactions between dark matter particles and germanium nuclei in cryogenic detectors. The experiment has achieved a low energy threshold with improved sensitivity to low-mass (<10  GeV/c^2) dark matter particles. We present an analysis of the final CDMSlite dataset, taken with a different detector than was used for the two previous CDMSlite datasets. This analysis includes a data “salting” method to protect against bias, improved noise discrimination, background modeling, and the use of profile likelihood methods to search for a dark matter signal in the presence of backgrounds. We achieve an energy threshold of 70 eV and significantly improve the sensitivity for dark matter particles with masses between 2.5 and 10  GeV/c^2 compared to previous analyses. We set an upper limit on the dark matter-nucleon scattering cross section in germanium of 5.4×10^(-42)  cm^2 at 5  GeV/c^2, a factor of ∼2.5 improvement over the previous CDMSlite result.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1103/PhysRevD.99.062001DOIArticle
https://arxiv.org/abs/1808.09098arXivDiscussion Paper
ORCID:
AuthorORCID
Chang, Y.-Y.0000-0002-6441-980X
Golwala, S. R.0000-0002-1098-7174
Additional Information:© 2019 American Physical Society. Received 5 September 2018; published 15 March 2019. The SuperCDMS collaboration gratefully acknowledges technical assistance from the staff of the Soudan Underground Laboratory and the Minnesota Department of Natural Resources. 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. Funding and support were received from the National Science Foundation, the U.S. Department of Energy, Fermilab URA Visiting Scholar Grant No. 15-S-33, NSERC Canada, the Canada Excellence Research Chair Fund, and MultiDark (Spanish MINECO). The SuperCDMS collaboration prepared this document using the resources of the Fermi National Accelerator Laboratory (Fermilab), a U.S. Department of Energy, Office of Science, HEP User Facility. Fermilab is managed by Fermi Research Alliance, LLC (FRA), acting under Contract No. DE-AC02-07CH11359. Pacific Northwest National Laboratory is operated by Battelle Memorial Institute under Contract No. DE-AC05-76RL01830 for the U.S. Department of Energy. SLAC is operated under Contract No. DE-AC02-76SF00515 with the U.S. Department of Energy.
Funders:
Funding AgencyGrant Number
NSFUNSPECIFIED
Fermilab15-S-33
Natural Sciences and Engineering Research Council of Canada (NSERC)UNSPECIFIED
Canada Research Chairs ProgramUNSPECIFIED
Ministerio de Economía, Industria y Competitividad (MINECO)MultiDark
Department of Energy (DOE)DE-AC02-07CH11359
Department of Energy (DOE)DE-AC05-76RL01830
Department of Energy (DOE)DE-AC02-76SF00515
Record Number:CaltechAUTHORS:20190315-081353179
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20190315-081353179
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:93854
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:15 Mar 2019 15:39
Last Modified:15 Mar 2019 15:39

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