Maximum likelihood analysis of low energy CDMS II germanium data
Name
PhysRevD.91.052021.pdf
Size
7.38 MB
Format
Adobe PDF
Checksum (MD5)
84ce82c9510830f2fa5d64730173cad4
Author(s)
Agnese, R.
Balakishiyeva, D.
Basu Thakur, R.
Bauer, D. A.
Borgland, A.
Bowles, M. A.
Brandt, D.
Brink, P. L.
Bunker, R.
Cabrera, B.
Date Issued
March 2015
Journal
Physical Review D
Publisher
American Physical Society
Citation
Agnese, R., et al. "Maximum likelihood analysis of low energy CDMS II germanium data." Phys. Rev. D 91, 052021 (March 2015). © 2015 American Physical Society
Version
Final published version
Abstract
We report on the results of a search for a Weakly Interacting Massive Particle (WIMP) signal in low-energy data of the Cryogenic Dark Matter Search experiment using a maximum likelihood analysis. A background model is constructed using geant4 to simulate the surface-event background from [superscript 210]Pb decay-chain events, while using independent calibration data to model the gamma background. Fitting this background model to the data results in no statistically significant WIMP component. In addition, we perform fits using an analytic ad hoc background model proposed by Collar and Fields, who claimed to find a large excess of signal-like events in our data. We confirm the strong preference for a signal hypothesis in their analysis under these assumptions, but excesses are observed in both single- and multiple-scatter events, which implies the signal is not caused by WIMPs, but rather reflects the inadequacy of their background model.
MIT Department
Massachusetts Institute of Technology. Department of Physics
MIT Kavli Institute for Astrophysics and Space Research
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1103/PhysRevD.91.052021
