An analysis of LUX data in the S2-only mode

LUX is the world's largest two-phase Xe time-projection chamber, with an active fiducial target mass in excess of 100 kg. In 2013, we reported a null result from our search for WIMP dark matter and set the most stringent limits on WIMP-nucleon cross section for a wide range of WIMP masses. As the energy of the recoiling Xe nucleus decreases below a few keV, the primary scintillation signal is often too small to detect. An S2-only technique, which relies on detecting the liberated electrons that escape recombination and drift to the liquid surface, allows us to lower the energy threshold, albeit at the cost of rejection power. We will present techniques developed for this study, including novel pulse-finding algorithms and simulation methods. The prospects for LUX sensitivity in this search mode will be outlined.