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New Constraints on Cosmic Ray-Boosted Dark Matter from the LUX-ZEPLIN Experiment.
J Aalbers1,2, D S Akerib1,2, A K Al Musalhi3
1SLAC National Accelerator Laboratory, Menlo Park, California 94025-7015, USA.
Researchers searched for boosted dark matter particles using the LUX-ZEPLIN experiment. No excess was found, leading to new limits on sub-GeV dark matter interactions with nucleons.
Area of Science:
- Particle Physics
- Astrophysics
- Cosmology
Background:
- Dual-phase xenon time projection chambers are sensitive to GeV/c² to TeV/c² dark matter.
- Detecting sub-GeV/c² dark matter is challenging due to low nuclear recoil energy thresholds.
Purpose of the Study:
- To search for sub-GeV/c² dark matter candidates boosted by cosmic ray collisions.
- To establish constraints on cosmic ray-boosted dark matter (CRDM) interactions.
Main Methods:
- Utilized a combined 4.2 metric ton/yr exposure from the LUX-ZEPLIN experiment.
- Analyzed data for signatures consistent with CRDM interactions.
Main Results:
- No significant excess of events above expected backgrounds was observed.
- Established world-leading constraints on the spin-independent CRDM-nucleon cross section.
Conclusions:
- The search sets new limits for sub-GeV/c² dark matter detection.
- Constraints reach as low as 3.9×10⁻³³ cm² at 90% confidence level for sub-GeV/c² masses.
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