Abstract
LUX-ZEPLIN (LZ) is a dark matter detector expected to obtain world-leading sensitivity to weakly interacting massive particles (WIMPs) interacting via nuclear recoils with a ~7-tonne xenon target mass. This manuscript presents sensitivity projections to several low-energy signals of the complementary electron recoil signal type: 1) an effective neutrino magnetic moment and 2) an effective neutrino millicharge, both for pp-chain solar neutrinos, 3) an axion flux generated by the Sun, 4) axion-like particles forming the galactic dark matter, 5) hidden photons, 6) mirror dark matter, and 7) leptophilic dark matter. World-leading sensitivities are expected in each case, a result of the large 5.6t 1000d exposure and low expected rate of electron recoil backgrounds in the $<$100keV energy regime. A consistent signal generation, background model and profile-likelihood analysis framework is used throughout.
Highlights
LUX-ZEPLIN (LZ) is a liquid xenon (LXe) timeprojection chamber (TPC) currently being commissioned at the Sanford Underground Research Facility (SURF) in the USA [1]
This paper presents sensitivity projections to several low-energy signals of the complementary electron recoil signal type: 1) an effective neutrino magnetic moment, and 2) an effective neutrino millicharge, both for pp-chain solar neutrinos, 3) an axion flux generated by the Sun, 4) axionlike particles forming the Galactic dark matter, 5) hidden photons, 6) mirror dark matter, and 7) leptophilic dark matter
It is the latest in a series of increasingly large LXe TPCs optimized for sensitivity to rare keV-scale nuclear recoil signatures indicative of weakly-interacting massive particle (WIMP) dark matter [2–10]
Summary
LUX-ZEPLIN (LZ) is a liquid xenon (LXe) timeprojection chamber (TPC) currently being commissioned at the Sanford Underground Research Facility (SURF) in the USA [1] It is the latest in a series of increasingly large LXe TPCs optimized for sensitivity to rare keV-scale nuclear recoil signatures indicative of weakly-interacting massive particle (WIMP) dark matter [2–10]. These detectors achieve extremely low background rates thanks to the very high purity of the LXe material itself and the selfshielding of the LXe, which inhibits the penetration of external radiation into the central fiducial LXe volume.
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