Search for Light Weakly-Interacting-Massive-Particle Dark Matter by Annual Modulation Analysis with a Point-Contact Germanium Detector at the China Jinping Underground Laboratory
Abstract
We present results on light weakly interacting massive particle (WIMP) searches with annual modulation (AM) analysis on data from a 1-kg mass p -type point-contact germanium detector of the CDEX-1B experiment at the China Jinping Underground Laboratory. Datasets with a total live time of 3.2 yr within a 4.2-yr span are analyzed with analysis threshold of 250 eVee. Limits on WIMP-nucleus (χ -N ) spin-independent cross sections as function of WIMP mass (mχ) at 90% confidence level (C.L.) are derived using the dark matter halo model. Within the context of the standard halo model, the 90% C.L. allowed regions implied by the DAMA/LIBRA and CoGeNT AM-based analysis are excluded at >99.99 % and 98% C.L., respectively. These results correspond to the best sensitivity at mχ<6 GeV /c2 among WIMP AM measurements to date.
- Publication:
-
Physical Review Letters
- Pub Date:
- November 2019
- DOI:
- 10.1103/PhysRevLett.123.221301
- arXiv:
- arXiv:1904.12889
- Bibcode:
- 2019PhRvL.123v1301Y
- Keywords:
-
- High Energy Physics - Experiment;
- High Energy Physics - Phenomenology;
- Physics - Instrumentation and Detectors
- E-Print:
- 5 pages, 4 figures