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Publication - Dr Bjoern Penning

    Projected WIMP sensitivity of the LUX-ZEPLIN (LZ) dark matter experiment

    Citation

    , Akerib, DS, Akerlof, CW, Alsum, SK, Araújo, HM, Arthurs, M, Balajthy, J, Balashov, S, Bauer, D, Belle, J, Beltrame, P, Benson, T, Biesiadzinski, TP, Boast, KE, Kreczko, L, Krikler, B & Penning, B, 2018, ‘Projected WIMP sensitivity of the LUX-ZEPLIN (LZ) dark matter experiment’. Physical Review D.

    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.

    Full details in the University publications repository