Neutrino Backgrounds in Future Liquid Noble Element Dark Matter Direct Detection Experiments

Gaspert, Andrea; Giampa, Pietro; Morrissey, David E.

doi:10.48550/arxiv.2108.03248

Cited by 6 publications

(6 citation statements)

References 136 publications

(279 reference statements)

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“…increase in overall leakage, when correctly modeled, has virtually no impact on sensitivity, consistent with the analysis performed in [35].…”

Section: Impact On Dark Matter Sensitivitysupporting

confidence: 80%

Measurement of Charge and Light Yields for $^{127}$Xe L-Shell Electron Captures in Liquid Xenon

Temples,

McLaughlin,

Bargemann

et al. 2021

Preprint

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Dark matter searches using dual-phase xenon time-projection chambers (LXe-TPCs) rely on their ability to reject background electron recoils (ERs) while searching for signal-like nuclear recoils (NRs). ER response is typically calibrated using β-decay sources, such as tritium, but these calibrations do not characterize events accompanied by an atomic vacancy, as in solar neutrino scatters off inner shell electrons. Such events lead to emission of X-rays and Auger electrons, resulting in higher electron-ion recombination and thus a more NR-like response than inferred from β-decay calibration. We present a cross-calibration of tritium β-decays and 127 Xe electron-capture decays (which produce inner-shell vacancies) in a small-scale LXe-TPC and give the most precise measurements to date of light and charge yields for the 127 Xe L-shell electron-capture in liquid xenon. We observe a 6.9σ (9.2σ) discrepancy in the L-shell capture response relative to tritium β-decays, measured at a drift field of 363 ± 14 V/cm (258 ± 13 V/cm), when compared to simulations tuned to reproduce the correct β-decay response. In dark matter searches, use of a background model that neglects this effect leads to overcoverage (higher limits) for background-only multi-kiloton-year exposures, but at a level much less than the 1-σ experiment-to-experiment variation of the 90% C.L. upper limit on the interaction rate of a 50 GeV/c 2 dark matter particle.I.

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“…increase in overall leakage, when correctly modeled, has virtually no impact on sensitivity, consistent with the analysis performed in [35].…”

Section: Impact On Dark Matter Sensitivitysupporting

confidence: 80%

Measurement of Charge and Light Yields for $^{127}$Xe L-Shell Electron Captures in Liquid Xenon

Temples,

McLaughlin,

Bargemann

et al. 2021

Preprint

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“…This is not surprisingwhile the increase in leakage for L-shell capture events on their own is striking, relatively few neutrino events both scatter on the L-shell and fall in the narrow energy window where the effect is significant. The small (∼5%) increase in overall leakage, when correctly modeled, has virtually no impact on sensitivity, consistent with the analysis performed in [36]. Using an inconsistent background model when setting a limit has a slightly larger effect.…”

Section: Impact On Dark Matter Sensitivitysupporting

confidence: 80%

Measurement of charge and light yields for Xe127 L -shell electron captures in liquid xenon

et al. 2021

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“…Despite the similarities between the signals, a conventional DM search would have been possible if there had been a precise understanding of neutrino background levels. Recently some have advocated using the term "neutrino fog" rather than "neutrino floor", implying a challenging, but not impossible signal-background discrimination [43][44][45][46][47][48]. Even though neutrino-nucleus cross sections are relatively accurately determined, neutrino fluxes are typically subject to large systematic uncertainties, causing large uncertainties in the number of expected neutrino events [49].…”

Section: Wimp Detection Below Neutrino Floor 21 Neutrino Floormentioning

confidence: 99%

Directional Detection of Dark Matter Using Solid-State Quantum Sensing

Ebadi¹,

Marshall²,

Phillips³

et al. 2022

Preprint

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Next-generation dark matter (DM) detectors searching for weakly interacting massive particles (WIMPs) will be sensitive to coherent scattering from solar neutrinos, demanding an efficient background-signal discrimination tool. Directional detectors improve sensitivity to WIMP DM despite the irreducible neutrino background. Widebandgap semiconductors offer a path to directional detection in a high-density target material. A detector of this type operates in a hybrid mode. The WIMP or neutrinoinduced nuclear recoil is detected using real-time charge, phonon, or photon collection. The directional signal, however, is imprinted as a durable sub-micron damage track in the lattice structure. This directional signal can be read out by a variety of atomic physics techniques, from point defect quantum sensing to x-ray microscopy. In this white paper, we present the detector principle and review the status of the experimental techniques required for directional readout of nuclear recoil tracks. Specifically, we focus on diamond as a target material; it is both a leading platform for emerging quantum technologies and a promising component of next-generation semiconductor electronics. Based on the development and demonstration of directional readout in diamond over the next decade, a future WIMP detector will leverage or motivate advances in multiple disciplines towards precision dark matter and neutrino physics.

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Neutrino Backgrounds in Future Liquid Noble Element Dark Matter Direct Detection Experiments

Cited by 6 publications

References 136 publications

Measurement of Charge and Light Yields for $^{127}$Xe L-Shell Electron Captures in Liquid Xenon

Measurement of Charge and Light Yields for $^{127}$Xe L-Shell Electron Captures in Liquid Xenon

Measurement of charge and light yields for Xe127 L -shell electron captures in liquid xenon

Directional Detection of Dark Matter Using Solid-State Quantum Sensing

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