Background Determination for the LUX-ZEPLIN (LZ) Dark Matter Experiment

The LUX-ZEPLIN (LZ) Collaboration

doi:10.48550/arXiv.2211.17120

Background Determination for the LUX-ZEPLIN (LZ) Dark Matter Experiment

The LUX-ZEPLIN (LZ) Collaboration

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Abstract

The LUX-ZEPLIN experiment recently reported limits on WIMP-nucleus interactions from its initial science run, down to $6.5\times10^{-48}$ cm$^2$ for the spin-independent interaction of a 30 GeV/c$^2$ WIMP at 90% confidence level. In this paper, we present a comprehensive analysis of the backgrounds important for this result and for other upcoming physics analyses, including neutrinoless double-beta decay searches and effective field theory interpretations of LUX-ZEPLIN data. We confirm that the in-situ determinations of bulk and fixed radioactive backgrounds are consistent with expectations from the ex-situ assays. The observed background rate after WIMP search criteria were applied was $(6.3\pm0.5)\times10^{-5}$ events/keV$_{ee}$/kg/day in the low energy region, approximately 60 times lower than the equivalent rate reported by the LUX experiment.

Original language	English
DOIs	https://doi.org/10.48550/arXiv.2211.17120
Publication status	Submitted - 30 Nov 2022

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25 pages, 15 figures

Keywords

hep-ex
physics.ins-det

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title = "Background Determination for the LUX-ZEPLIN (LZ) Dark Matter Experiment",

abstract = "The LUX-ZEPLIN experiment recently reported limits on WIMP-nucleus interactions from its initial science run, down to $6.5\times10^{-48}$ cm$^2$ for the spin-independent interaction of a 30 GeV/c$^2$ WIMP at 90% confidence level. In this paper, we present a comprehensive analysis of the backgrounds important for this result and for other upcoming physics analyses, including neutrinoless double-beta decay searches and effective field theory interpretations of LUX-ZEPLIN data. We confirm that the in-situ determinations of bulk and fixed radioactive backgrounds are consistent with expectations from the ex-situ assays. The observed background rate after WIMP search criteria were applied was $(6.3\pm0.5)\times10^{-5}$ events/keV$_{ee}$/kg/day in the low energy region, approximately 60 times lower than the equivalent rate reported by the LUX experiment.",

keywords = "hep-ex, physics.ins-det",

author = "{The LUX-ZEPLIN (LZ) Collaboration} and J. Aalbers and Akerib, {D. S.} and Musalhi, {A. K. Al} and F. Alder and Alsum, {S. K.} and Amarasinghe, {C. S.} and A. Ames and N. Angelides and Ara{\'u}jo, {H. M.} and M. Arthurs and J. Bang and Bargemann, {J. W.} and A. Baxter and K. Beattie and P. Beltrame and Bernard, {E. P.} and A. Bhatti and A. Biekert and Biesiadzinski, {T. P.} and Blockinger, {G. M.} and B. Boxer and Brew, {C. A. J.} and Eriksen, {S. R.} and H. Flaecher and L. Korley and L. Kreczko and B. Krikler and B. Penning and Wang, {J. J.} and Wright, {C. J.}",

note = "25 pages, 15 figures",

year = "2022",

month = nov,

day = "30",

doi = "10.48550/arXiv.2211.17120",

language = "English",

type = "WorkingPaper",

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T1 - Background Determination for the LUX-ZEPLIN (LZ) Dark Matter Experiment

AU - The LUX-ZEPLIN (LZ) Collaboration

AU - Aalbers, J.

AU - Akerib, D. S.

AU - Musalhi, A. K. Al

AU - Alder, F.

AU - Alsum, S. K.

AU - Amarasinghe, C. S.

AU - Ames, A.

AU - Angelides, N.

AU - Araújo, H. M.

AU - Arthurs, M.

AU - Bang, J.

AU - Bargemann, J. W.

AU - Baxter, A.

AU - Beattie, K.

AU - Beltrame, P.

AU - Bernard, E. P.

AU - Bhatti, A.

AU - Biekert, A.

AU - Biesiadzinski, T. P.

AU - Blockinger, G. M.

AU - Boxer, B.

AU - Brew, C. A. J.

AU - Eriksen, S. R.

AU - Flaecher, H.

AU - Korley, L.

AU - Kreczko, L.

AU - Krikler, B.

AU - Penning, B.

AU - Wang, J. J.

AU - Wright, C. J.

N1 - 25 pages, 15 figures

PY - 2022/11/30

Y1 - 2022/11/30

N2 - The LUX-ZEPLIN experiment recently reported limits on WIMP-nucleus interactions from its initial science run, down to $6.5\times10^{-48}$ cm$^2$ for the spin-independent interaction of a 30 GeV/c$^2$ WIMP at 90% confidence level. In this paper, we present a comprehensive analysis of the backgrounds important for this result and for other upcoming physics analyses, including neutrinoless double-beta decay searches and effective field theory interpretations of LUX-ZEPLIN data. We confirm that the in-situ determinations of bulk and fixed radioactive backgrounds are consistent with expectations from the ex-situ assays. The observed background rate after WIMP search criteria were applied was $(6.3\pm0.5)\times10^{-5}$ events/keV$_{ee}$/kg/day in the low energy region, approximately 60 times lower than the equivalent rate reported by the LUX experiment.

AB - The LUX-ZEPLIN experiment recently reported limits on WIMP-nucleus interactions from its initial science run, down to $6.5\times10^{-48}$ cm$^2$ for the spin-independent interaction of a 30 GeV/c$^2$ WIMP at 90% confidence level. In this paper, we present a comprehensive analysis of the backgrounds important for this result and for other upcoming physics analyses, including neutrinoless double-beta decay searches and effective field theory interpretations of LUX-ZEPLIN data. We confirm that the in-situ determinations of bulk and fixed radioactive backgrounds are consistent with expectations from the ex-situ assays. The observed background rate after WIMP search criteria were applied was $(6.3\pm0.5)\times10^{-5}$ events/keV$_{ee}$/kg/day in the low energy region, approximately 60 times lower than the equivalent rate reported by the LUX experiment.

KW - hep-ex

KW - physics.ins-det

U2 - 10.48550/arXiv.2211.17120

DO - 10.48550/arXiv.2211.17120

M3 - Preprint

BT - Background Determination for the LUX-ZEPLIN (LZ) Dark Matter Experiment

ER -

Background Determination for the LUX-ZEPLIN (LZ) Dark Matter Experiment

Abstract

Bibliographical note

Keywords

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