We present a search for electron-recoil signatures from the charged-current absorption of fermionic dark matter using the EXO-200 detector. We report an average electron-recoil background rate of above 4 MeV and find no statistically significant excess over our background projection. Using a total exposure of 234.1 kg yr, we exclude new parameter space for the charged-current absorption cross section for dark matter masses between with a minimum of at 8.3 MeV at the 90% confidence level.
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"value": "We present a search for electron-recoil signatures from the charged-current absorption of fermionic dark matter using the EXO-200 detector. We report an average electron-recoil background rate of <math><mrow><mrow><mn>6.8</mn><mo>\u00d7</mo><msup><mrow><mn>10</mn></mrow><mrow><mn>4</mn></mrow></msup><mtext> </mtext><mtext> </mtext></mrow><mrow><mrow><mi>cts</mi><mtext> </mtext></mrow><msup><mrow><mi>kg</mi></mrow><mrow><mo>\u2212</mo><mn>1</mn></mrow></msup><mtext> </mtext><msup><mrow><mi>yr</mi></mrow><mrow><mo>\u2212</mo><mn>1</mn></mrow></msup><mtext> </mtext><msup><mrow><mi>keV</mi></mrow><mrow><mo>\u2212</mo><mn>1</mn></mrow></msup></mrow></mrow></math> above 4 MeV and find no statistically significant excess over our background projection. Using a total <math><mrow><mmultiscripts><mrow><mi>Xe</mi></mrow><mprescripts></mprescripts><none></none><mrow><mn>136</mn></mrow></mmultiscripts></mrow></math> exposure of 234.1 kg yr, we exclude new parameter space for the charged-current absorption cross section for dark matter masses between <math><mrow><msub><mrow><mi>m</mi></mrow><mrow><mi>\u03c7</mi></mrow></msub><mo>=</mo><mn>2.6</mn><mi>\u2013</mi><mn>11.6</mn><mtext> </mtext><mtext> </mtext><mrow><mi>MeV</mi></mrow></mrow></math> with a minimum of <math><mrow><mn>6</mn><mo>\u00d7</mo><msup><mrow><mn>10</mn></mrow><mrow><mo>\u2212</mo><mn>51</mn></mrow></msup><mtext> </mtext><msup><mrow><mi>cm</mi></mrow><mrow><mn>2</mn></mrow></msup></mrow></math> at 8.3 MeV at the 90% confidence level."
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