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Low-mass dark matter search using ionization signals in XENON100


XENON Collaboration; Aprile, E; Aalbers, J; Agostini, F; et al; Barrow, P; Baudis, L; Ferella, A; Franco, D; Galloway, M; Kessler, G; Kish, A; Mayani, D; Pakarha, P; Wulf, J (2016). Low-mass dark matter search using ionization signals in XENON100. Physical review. D:092001.

Abstract

We perform a low-mass dark matter search using an exposure of 30  kg×yr with the XENON100 detector. By dropping the requirement of a scintillation signal and using only the ionization signal to determine the interaction energy, we lowered the energy threshold for detection to 0.7 keV for nuclear recoils. No dark matter detection can be claimed because a complete background model cannot be constructed without a primary scintillation signal. Instead, we compute an upper limit on the WIMP-nucleon scattering cross section under the assumption that every event passing our selection criteria could be a signal event. Using an energy interval from 0.7 keV to 9.1 keV, we derive a limit on the spin-independent WIMP-nucleon cross section that excludes WIMPs with a mass of 6  GeV/c2 above 1.4×10-41  cm2 at 90% confidence level.

Abstract

We perform a low-mass dark matter search using an exposure of 30  kg×yr with the XENON100 detector. By dropping the requirement of a scintillation signal and using only the ionization signal to determine the interaction energy, we lowered the energy threshold for detection to 0.7 keV for nuclear recoils. No dark matter detection can be claimed because a complete background model cannot be constructed without a primary scintillation signal. Instead, we compute an upper limit on the WIMP-nucleon scattering cross section under the assumption that every event passing our selection criteria could be a signal event. Using an energy interval from 0.7 keV to 9.1 keV, we derive a limit on the spin-independent WIMP-nucleon cross section that excludes WIMPs with a mass of 6  GeV/c2 above 1.4×10-41  cm2 at 90% confidence level.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:2016
Deposited On:28 Dec 2016 16:10
Last Modified:08 Mar 2017 10:39
Publisher:American Physical Society
ISSN:2470-0010
Publisher DOI:https://doi.org/10.1103/PhysRevD.94.092001

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