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Title: Compatibility of DAMA/LIBRA dark matter detection with other searches

Abstract

The DAMA/NaI and DAMA/LIBRA annual modulation data, which may be interpreted as a signal for the existence of weakly interacting dark matter (WIMPs) in our galactic halo, are examined in light of null results from other experiments: CDMS, XENON10, CRESST I, CoGeNT, TEXONO, and Super-Kamiokande (SuperK). We use the energy spectrum of the combined DAMA modulation data given in 36 bins, and include the effect of channeling. Several statistical tools are implemented in our study: likelihood ratio with a global fit and with raster scans in the WIMP mass and goodness-of-fit (g.o.f.). These approaches allow us to differentiate between the preferred (global best fit) and allowed (g.o.f.) parameter regions. It is hard to find WIMP masses and couplings consistent with all existing data sets; the surviving regions of parameter space are found here. For spin-independent (SI) interactions, the best fit DAMA regions are ruled out to the 3{sigma} C.L., even with channeling taken into account. However, for WIMP masses of {approx} 8 GeV some parameters outside these regions still yield a moderately reasonable fit to the DAMA data and are compatible with all 90% C.L. upper limits from negative searches, when channeling is included. For spin-dependent (SD) interactions with proton-onlymore » couplings, a range of masses below 10 GeV is compatible with DAMA and other experiments, with and without channeling, when SuperK indirect detection constraints are included; without the SuperK constraints, masses as high as {approx} 20 GeV are compatible. For SD neutron-only couplings we find no parameters compatible with all the experiments. Mixed SD couplings are examined: e.g. {approx} 8 GeV mass WIMPs with a{sub n} = {+-}a{sub p} are found to be consistent with all experiments. In short, there are surviving regions at low mass for both SI and SD interactions; if indirect detection limits are relaxed, some SD proton-only couplings at high masses also survive.« less

Authors:
 [1];  [2];  [3]
  1. William I. Fine Theoretical Physics Institute, School of Physics and Astronomy, University of Minnesota, Minneapolis, MN 55455 (United States)
  2. Department of Physics and Astronomy, UCLA, 430 Portola Plaza, Los Angeles, CA 90095 (United States)
  3. Department of Physics, University of Utah, 115 S 1400 E 201 Salt Lake City, UT 84112 (United States)
Publication Date:
OSTI Identifier:
22156960
Resource Type:
Journal Article
Journal Name:
Journal of Cosmology and Astroparticle Physics
Additional Journal Information:
Journal Volume: 2009; Journal Issue: 04; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1475-7516
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; CHANNELING; COMPATIBILITY; COUPLINGS; DETECTION; ENERGY SPECTRA; GEV RANGE; LIMITING VALUES; MASS; MATHEMATICAL SPACE; NEUTRONS; NONLUMINOUS MATTER; PROTONS; SENSITIVITY; SIGNALS

Citation Formats

Savage, C., Gelmini, G., Gondolo, P., and Freese, K., E-mail: cmsavage@physics.umn.edu, E-mail: gelmini@physics.ucla.edu, E-mail: paolo@physics.utah.edu, E-mail: ktfreese@umich.edu. Compatibility of DAMA/LIBRA dark matter detection with other searches. United States: N. p., 2009. Web. doi:10.1088/1475-7516/2009/04/010.
Savage, C., Gelmini, G., Gondolo, P., & Freese, K., E-mail: cmsavage@physics.umn.edu, E-mail: gelmini@physics.ucla.edu, E-mail: paolo@physics.utah.edu, E-mail: ktfreese@umich.edu. Compatibility of DAMA/LIBRA dark matter detection with other searches. United States. https://doi.org/10.1088/1475-7516/2009/04/010
Savage, C., Gelmini, G., Gondolo, P., and Freese, K., E-mail: cmsavage@physics.umn.edu, E-mail: gelmini@physics.ucla.edu, E-mail: paolo@physics.utah.edu, E-mail: ktfreese@umich.edu. 2009. "Compatibility of DAMA/LIBRA dark matter detection with other searches". United States. https://doi.org/10.1088/1475-7516/2009/04/010.
@article{osti_22156960,
title = {Compatibility of DAMA/LIBRA dark matter detection with other searches},
author = {Savage, C. and Gelmini, G. and Gondolo, P. and Freese, K., E-mail: cmsavage@physics.umn.edu, E-mail: gelmini@physics.ucla.edu, E-mail: paolo@physics.utah.edu, E-mail: ktfreese@umich.edu},
abstractNote = {The DAMA/NaI and DAMA/LIBRA annual modulation data, which may be interpreted as a signal for the existence of weakly interacting dark matter (WIMPs) in our galactic halo, are examined in light of null results from other experiments: CDMS, XENON10, CRESST I, CoGeNT, TEXONO, and Super-Kamiokande (SuperK). We use the energy spectrum of the combined DAMA modulation data given in 36 bins, and include the effect of channeling. Several statistical tools are implemented in our study: likelihood ratio with a global fit and with raster scans in the WIMP mass and goodness-of-fit (g.o.f.). These approaches allow us to differentiate between the preferred (global best fit) and allowed (g.o.f.) parameter regions. It is hard to find WIMP masses and couplings consistent with all existing data sets; the surviving regions of parameter space are found here. For spin-independent (SI) interactions, the best fit DAMA regions are ruled out to the 3{sigma} C.L., even with channeling taken into account. However, for WIMP masses of {approx} 8 GeV some parameters outside these regions still yield a moderately reasonable fit to the DAMA data and are compatible with all 90% C.L. upper limits from negative searches, when channeling is included. For spin-dependent (SD) interactions with proton-only couplings, a range of masses below 10 GeV is compatible with DAMA and other experiments, with and without channeling, when SuperK indirect detection constraints are included; without the SuperK constraints, masses as high as {approx} 20 GeV are compatible. For SD neutron-only couplings we find no parameters compatible with all the experiments. Mixed SD couplings are examined: e.g. {approx} 8 GeV mass WIMPs with a{sub n} = {+-}a{sub p} are found to be consistent with all experiments. In short, there are surviving regions at low mass for both SI and SD interactions; if indirect detection limits are relaxed, some SD proton-only couplings at high masses also survive.},
doi = {10.1088/1475-7516/2009/04/010},
url = {https://www.osti.gov/biblio/22156960}, journal = {Journal of Cosmology and Astroparticle Physics},
issn = {1475-7516},
number = 04,
volume = 2009,
place = {United States},
year = {2009},
month = {4}
}