Improved Limits on Scattering of Weakly Interacting Massive Particles from Reanalysis of 2013 LUX Data
Abstract
We present constraints on weakly interacting massive particles (WIMP)-nucleus scattering from the 2013 data of the Large Underground Xenon dark matter experiment, including 1.4 ×104 kg day of search exposure. This new analysis incorporates several advances: single-photon calibration at the scintillation wavelength, improved event-reconstruction algorithms, a revised background model including events originating on the detector walls in an enlarged fiducial volume, and new calibrations from decays of an injected tritium β source and from kinematically constrained nuclear recoils down to 1.1 keV. Sensitivity, especially to low-mass WIMPs, is enhanced compared to our previous results which modeled the signal only above a 3 keV minimum energy. Under standard dark matter halo assumptions and in the mass range above 4 GeV c-2 , these new results give the most stringent direct limits on the spin-independent WIMP-nucleon cross section. The 90% C.L. upper limit has a minimum of 0.6 zb at 33 GeV c-2 WIMP mass.
- Publication:
-
Physical Review Letters
- Pub Date:
- April 2016
- DOI:
- 10.1103/PhysRevLett.116.161301
- arXiv:
- arXiv:1512.03506
- Bibcode:
- 2016PhRvL.116p1301A
- Keywords:
-
- Astrophysics - Cosmology and Nongalactic Astrophysics;
- Astrophysics - Instrumentation and Methods for Astrophysics;
- High Energy Physics - Experiment;
- Physics - Instrumentation and Detectors
- E-Print:
- Accepted by Phys. Rev. Lett