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Title: Implications of the Gaia sausage for dark matter nuclear interactions

Abstract

The advent of the Gaia era has led to potentially revolutionary understanding of dark matter (DM) dynamics in our galaxy, which has important consequences for direct detection (DD) experiments. In this paper, we study how the empirical DM velocity distribution inferred from Gaia-sausage, a dominant substructure in the solar neighborhood, affects the interpretation of DD data. We survey different classes of operators in the nonrelativistic effective field theory that could arise from several relativistic benchmark models and emphasize that the Gaia velocity distribution could modify both the total number of events as well as the shape of the differential recoil spectra, the two primary observables in DD experiments. Employing the Euclideanized signal method, we investigate the effects of the Gaia distribution on reconstructing DM model parameters and identifying the correct DM model given a positive signal at future DD experiments. We find that for light DM with mass ~10 GeV, the Gaia distribution poses an additional challenge for characterizing DM interactions with ordinary matter, which may be addressed by combining complementary DD experiments with different targets and lowering the detection threshold. Meanwhile, for heavy DM with mass above ~30 GeV , depending on the type of DM model, there couldmore » be a (moderate) improvement in the sensitivity at future DD experiments.« less

Authors:
ORCiD logo [1];  [1];  [1]
  1. Brown Univ., Providence, RI (United States)
Publication Date:
Research Org.:
Brown Univ., Providence, RI (United States)
Sponsoring Org.:
USDOE Office of Science (SC); National Science Foundation (NSF); National Aeronautics and Space Administration (NASA)
OSTI Identifier:
1802028
Grant/Contract Number:  
SC0010010; NSF PHY-1748958; 80NSSC18K1010
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review. D.
Additional Journal Information:
Journal Volume: 101; Journal Issue: 6; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; Astronomy & Astrophysics; Physics

Citation Formats

Buch, Jatan, Fan, JiJi, and Leung, John Shing Chau. Implications of the Gaia sausage for dark matter nuclear interactions. United States: N. p., 2020. Web. doi:10.1103/physrevd.101.063026.
Buch, Jatan, Fan, JiJi, & Leung, John Shing Chau. Implications of the Gaia sausage for dark matter nuclear interactions. United States. https://doi.org/10.1103/physrevd.101.063026
Buch, Jatan, Fan, JiJi, and Leung, John Shing Chau. Wed . "Implications of the Gaia sausage for dark matter nuclear interactions". United States. https://doi.org/10.1103/physrevd.101.063026. https://www.osti.gov/servlets/purl/1802028.
@article{osti_1802028,
title = {Implications of the Gaia sausage for dark matter nuclear interactions},
author = {Buch, Jatan and Fan, JiJi and Leung, John Shing Chau},
abstractNote = {The advent of the Gaia era has led to potentially revolutionary understanding of dark matter (DM) dynamics in our galaxy, which has important consequences for direct detection (DD) experiments. In this paper, we study how the empirical DM velocity distribution inferred from Gaia-sausage, a dominant substructure in the solar neighborhood, affects the interpretation of DD data. We survey different classes of operators in the nonrelativistic effective field theory that could arise from several relativistic benchmark models and emphasize that the Gaia velocity distribution could modify both the total number of events as well as the shape of the differential recoil spectra, the two primary observables in DD experiments. Employing the Euclideanized signal method, we investigate the effects of the Gaia distribution on reconstructing DM model parameters and identifying the correct DM model given a positive signal at future DD experiments. We find that for light DM with mass ~10 GeV, the Gaia distribution poses an additional challenge for characterizing DM interactions with ordinary matter, which may be addressed by combining complementary DD experiments with different targets and lowering the detection threshold. Meanwhile, for heavy DM with mass above ~30 GeV , depending on the type of DM model, there could be a (moderate) improvement in the sensitivity at future DD experiments.},
doi = {10.1103/physrevd.101.063026},
journal = {Physical Review. D.},
number = 6,
volume = 101,
place = {United States},
year = {Wed Mar 25 00:00:00 EDT 2020},
month = {Wed Mar 25 00:00:00 EDT 2020}
}

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