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Title: Projected WIMP Sensitivity of the LUX-ZEPLIN (LZ) Dark Matter Experiment

Abstract

LUX-ZEPLIN (LZ) is a next generation dark matter direct detection experiment that will operate 4850 feet underground at the Sanford Underground Research Facility (SURF) in Lead, South Dakota, USA. Using a two-phase xenon detector with an active mass of 7 tonnes, LZ will search primarily for low-energy interactions with Weakly Interacting Massive Particles (WIMPs), which are hypothesized to make up the dark matter in our galactic halo. In this paper, the projected WIMP sensitivity of LZ is presented based on the latest background estimates and simulations of the detector. For a 1000 live day run using a 5.6 tonne fiducial mass, LZ is projected to exclude at 90% confidence level spin-independent WIMP-nucleon cross sections above $$1.6 \times 10^{-48}$$ cm$$^{2}$$ for a 40 $$\mathrm{GeV}/c^{2}$$ mass WIMP. Additionally, a $$5\sigma$$ discovery potential is projected reaching cross sections below the existing and projected exclusion limits of similar experiments that are currently operating. For spin-dependent WIMP-neutron(-proton) scattering, a sensitivity of $$2.7 \times 10^{-43}$$ cm$$^{2}$$ ($$8.1 \times 10^{-42}$$ cm$$^{2}$$) for a 40 $$\mathrm{GeV}/c^{2}$$ mass WIMP is expected. With construction well underway, LZ is on track for underground installation at SURF in 2019 and will start collecting data in 2020.

Authors:
;
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Contributing Org.:
LUX-ZEPLIN
OSTI Identifier:
1437398
Report Number(s):
arXiv:1802.06039; FERMILAB-PUB-18-054-AE-PPD
1655569
DOE Contract Number:  
AC02-07CH11359
Resource Type:
Journal Article
Journal Name:
TBD
Additional Journal Information:
Journal Name: TBD
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Akerib, D.S., and et al. Projected WIMP Sensitivity of the LUX-ZEPLIN (LZ) Dark Matter Experiment. United States: N. p., 2018. Web.
Akerib, D.S., & et al. Projected WIMP Sensitivity of the LUX-ZEPLIN (LZ) Dark Matter Experiment. United States.
Akerib, D.S., and et al. Fri . "Projected WIMP Sensitivity of the LUX-ZEPLIN (LZ) Dark Matter Experiment". United States. https://www.osti.gov/servlets/purl/1437398.
@article{osti_1437398,
title = {Projected WIMP Sensitivity of the LUX-ZEPLIN (LZ) Dark Matter Experiment},
author = {Akerib, D.S. and et al.},
abstractNote = {LUX-ZEPLIN (LZ) is a next generation dark matter direct detection experiment that will operate 4850 feet underground at the Sanford Underground Research Facility (SURF) in Lead, South Dakota, USA. Using a two-phase xenon detector with an active mass of 7 tonnes, LZ will search primarily for low-energy interactions with Weakly Interacting Massive Particles (WIMPs), which are hypothesized to make up the dark matter in our galactic halo. In this paper, the projected WIMP sensitivity of LZ is presented based on the latest background estimates and simulations of the detector. For a 1000 live day run using a 5.6 tonne fiducial mass, LZ is projected to exclude at 90% confidence level spin-independent WIMP-nucleon cross sections above $1.6 \times 10^{-48}$ cm$^{2}$ for a 40 $\mathrm{GeV}/c^{2}$ mass WIMP. Additionally, a $5\sigma$ discovery potential is projected reaching cross sections below the existing and projected exclusion limits of similar experiments that are currently operating. For spin-dependent WIMP-neutron(-proton) scattering, a sensitivity of $2.7 \times 10^{-43}$ cm$^{2}$ ($8.1 \times 10^{-42}$ cm$^{2}$) for a 40 $\mathrm{GeV}/c^{2}$ mass WIMP is expected. With construction well underway, LZ is on track for underground installation at SURF in 2019 and will start collecting data in 2020.},
doi = {},
journal = {TBD},
number = ,
volume = ,
place = {United States},
year = {2018},
month = {2}
}