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Published on: November 15, 2013
Constraints on Solar Reflected Dark Matter from XENON1T and XENONnT Data
1Columbia University, Physics Department, New York, New York 10027, USA.
Abstract:
We report on a search for sub-GeV dark matter upscattered via the solar reflection mechanism in the heavy mediator scenario. Under the standard halo model, keV-MeV dark matter produces nuclear recoils with energies below the detection threshold of liquid xenon time projection chambers. We enhance sensitivity to low-mass dark matter (DM) by considering dark matter-electron scattering, employing dedicated event selections to reduce the detection threshold and exploiting the additional kinetic energy imparted to the dark matter particle by solar upscattering. Using XENON1T ionization-only and XENONnT low-energy electronic recoil datasets, we exclude previously unconstrained DM-electron scattering cross section for masses between 4.6 and 20 keV/c^{2} and between 0.2 and 2 MeV/c^{2}, reaching a minimum of 3.41×10^{-39} cm^{2} for a mass of 0.3 MeV/c^{2} at 90% confidence level.
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