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Title: Search for annual and diurnal rate modulations in the LUX experiment

Journal Article · · Physical Review D

Various dark matter models predict annual and diurnal modulations of dark matter interaction rates in Earth-based experiments as a result of the Earth’s motion in the halo. Observation of such features can provide generic evidence for detection of dark matter interactions. This paper reports a search for both annual and diurnal rate modulations in the LUX dark matter experiment using over 20 calendar months of data acquired between 2013 and 2016. This search focuses on electron recoil events at low energies, where leptophilic dark matter interactions are expected to occur and where the DAMA experiment has observed a strong rate modulation for over two decades. By using the innermost volume of the LUX detector and developing robust cuts and corrections, we obtained a stable event rate of 2.3±0.2 cpd/keVee/tonne, which is among the lowest in all dark matter experiments. No statistically significant annual modulation was observed in energy windows up to 26 keVee. Between 2 and 6 keVee, this analysis demonstrates the most sensitive annual modulation search up to date, with 9.2σ tension with the DAMA/LIBRA result. We also report no observation of diurnal modulations above 0.2 cpd/keVee/tonne amplitude between 2 and 6 keVee.

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Brown Univ., Providence, RI (United States); Texas A & M Univ., College Station, TX (United States); Univ. of California, Davis, CA (United States); Univ. of Rochester, NY (United States); University of California, Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP); USDOE National Nuclear Security Administration (NNSA), Office of Defense Nuclear Nonproliferation
Contributing Organization:
LUX Collaboration
Grant/Contract Number:
AC52-07NA27344; AC02-05CH11231; SC0010010; FG02-08ER41549; FG02-91ER40688; FG02-95ER40917; FG02-91ER40674; SC0006605; NA0000979; SC0017891
OSTI ID:
1476217
Alternate ID(s):
OSTI ID: 1474198; OSTI ID: 1477392; OSTI ID: 1532740
Report Number(s):
LLNL-JRNL-757487; 945315
Journal Information:
Physical Review D, Vol. 98, Issue 6; ISSN 2470-0010
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 31 works
Citation information provided by
Web of Science

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Cited By (9)

Direct detection of WIMP dark matter: concepts and status journal August 2019
Electron-interacting dark matter: Implications from DAMA/LIBRA-phase2 and prospects for liquid xenon detectors and NaI detectors journal September 2019
Analysis of backgrounds for the ANAIS-112 dark matter experiment journal May 2019
Hadronic and Hadron-Like Physics of Dark Matter journal April 2019
Accretion-induced Collapse of Dark Matter Admixed White Dwarfs. I. Formation of Low-mass Neutron Stars journal October 2019
Direct Detection of WIMP Dark Matter: Concepts and Status text January 2019
First results on dark matter annual modulation from ANAIS-112 experiment text January 2019
Electron extraction efficiency study for dual-phase xenon dark matter experiments text January 2019
Hadronic and hadron-like physics of Dark Matter text January 2019