The Present and Future of Searching for Dark Matter with LUX and LZ
  The LUX collaboration new results advance the search for dark matter
candidate particles in the 4 GeV/c^2 and higher mass range, with a maximal
spin-independent 90% C.L. limit of 2 x 10^-46 cm^2 at 50 GeV/c^2 for its 332
live-day run, following after 6 x 10^-46 cm^2 cross-section for 33 GeV/c^2 mass
from the re-analysis of its initial 95 live-day WIMP search data from December
2015. LUX has performed multiple advanced in situ neutron and beta/gamma
calibrations of light and charge yields down to 1.1 and 0.7 keV, respectively,
in nuclear recoil energy and 1.3 and 0.2 keV in units of electron recoil
energy, thereby bypassing the past practice of extrapolating yields from ex
situ calibrations or simulation models alone. For this conference proceedings,
consequences of the new calibrations for the limit on the interaction
cross-sections for low-mass WIMPs will be highlighted. Previous claims of a
WIMP signal, from other detectors, are now even more strongly disfavored,
assuming isospin invariance and the standard WIMP halo model. Both
spin-independent and spin-dependent limits will be discussed, including the
recent completion of LUX's 332-live-day blind run. Lastly, we highlight the
conceptual design and future plan for its 10-ton-scale, next-generation
successor LZ, which plans on achieving < 3 x 10^-48 cm^2 sensitivity for a WIMP
of mass 40 GeV/c^2.
