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The LUX dark matter search experiment is a 350 kg dual-phase xenon timeprojection chamber located at the 4850 ft level of the Sanford UndergroundResearch Facility in Lead, SD. The success of two-phase xenon detectors fordark matter searches relies on their ability to distinguish electron recoil(ER) background events from nuclear recoil (NR) signal events. Typically, theNR-ER discrimination is obtained from the ratio of the electroluminescencelight (S2) to the prompt scintillation light (S1). Analysis of the S1 pulseshape is an additional discrimination technique that can be used to distinguishNR from ER. Pulse-shape NR-ER discrimination can be achieved based on the ratioof the de-excitation processes from singlet and triplet states that generatethe S1. The NR S1 is dominated by the de-excitation process from singlet stateswith a time constant of about 3 ns while the ER S1 is dominated by thede-excitation process from triplet states with a time constant of about 24 ns.As the size of the detectors increases, the variation in the S1 photon flightpath can become comparable to these decay constants, reducing the utility ofpulse-shape analysis to separate NR from ER. The effect of path lengthvariations in the LUX detector has been studied using the results ofsimulations and the impact on the S1 pulse shape analysis is discussed.

The Impact of Photon Flight Path on S1 Pulse Shape Analysis in Liquid Xenon Two-phase Detectors