Bulletin of the American Physical Society
APS April Meeting 2019
Volume 64, Number 3
Saturday–Tuesday, April 13–16, 2019; Denver, Colorado
Session J09: Sub-GeV Dark Matter
1:30 PM–3:18 PM,
Sunday, April 14, 2019
Sheraton
Room: Governor's Square 11
Sponsoring
Unit:
DPF
Chair: Bertrand Echenard, Caltech
Abstract: J09.00006 : Low-mass Dark Matter Search Using Ionization Signals in LUX*
2:30 PM–2:42 PM
View Presentation Abstract
Presenter:
Peter Sorensen
(Lawrence Berkeley National Laboratory)
Author:
Peter Sorensen
(Lawrence Berkeley National Laboratory)
Collaboration:
LUX
LUX (Large Underground Xenon) is a retired, 250 kg, liquid xenon, direct dark matter detection experiment that has published three, previously world leading limits on the spin-independent cross section for WIMP-nucleon scattering in the 5-1000+ GeV mass range. LUX was successful thanks to a two channel readout of both scintillation (S1) and ionization (S2) that allows for event position reconstruction and, thus, rejection of backgrounds occurring primarily at the edges of the xenon volume. However, because the S2 signal is detected with approximately ⨉10 greater efficiency than the S1 signal, xenon detectors can lower their energy threshold and look for the nuclear recoils of lower mass dark matter particles by letting go of the requirement of an S1. In this type of analysis, additional background events are expected, because the reconstructed z-coordinate is no longer accessible. In addition to this expected increase, we have found an excess of background events emitted by the electrodes. In this talk, a new mitigation strategy for electrode events is outlined and the latest results from LUX’s ionization-only low-mass dark matter analysis are presented.
*Supported by the U.S. Department of Energy, SC-HEP award number DE- AC02-05CH1123.
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