This article presents an analysis and the resulting limits on light dark matter inelastically scattering off of electrons, and on dark photon and axionlike particle absorption, using a second-generation SuperCDMS high-voltage eV-resolution detector. The 0.93 g Si detector achieved a 3 eV phonon energy resolution; for a detector bias of 100 V, this corresponds to a charge resolution of 3% of a single electron-hole pair. The energy spectrum is reported from a blind analysis with 1.2 g-days of exposure acquired in an above-ground laboratory. With charge carrier trapping and impact ionization effects incorporated into the dark matter signal models, the dark matter-electron cross section is constrained for dark matter masses from 0.5 to ; in the mass range from 1.2 to the dark photon kinetic mixing parameter and the axioelectric coupling constant are constrained. The minimum 90% confidence-level upper limits within the above-mentioned mass ranges are , , and .
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"value": "This article presents an analysis and the resulting limits on light dark matter inelastically scattering off of electrons, and on dark photon and axionlike particle absorption, using a second-generation SuperCDMS high-voltage eV-resolution detector. The 0.93 g Si detector achieved a 3 eV phonon energy resolution; for a detector bias of 100 V, this corresponds to a charge resolution of 3% of a single electron-hole pair. The energy spectrum is reported from a blind analysis with 1.2 g-days of exposure acquired in an above-ground laboratory. With charge carrier trapping and impact ionization effects incorporated into the dark matter signal models, the dark matter-electron cross section <math><msub><mover><mi>\u03c3</mi><mo>\u00af</mo></mover><mi>e</mi></msub></math> is constrained for dark matter masses from 0.5 to <math><msup><mn>10</mn><mn>4</mn></msup><mtext> </mtext><mtext> </mtext><mi>MeV</mi><mo>/</mo><msup><mi>c</mi><mn>2</mn></msup></math>; in the mass range from 1.2 to <math><mn>50</mn><mtext> </mtext><mtext> </mtext><mi>eV</mi><mo>/</mo><msup><mi>c</mi><mn>2</mn></msup></math> the dark photon kinetic mixing parameter <math><mi>\u03f5</mi></math> and the axioelectric coupling constant <math><msub><mi>g</mi><mrow><mi>a</mi><mi>e</mi></mrow></msub></math> are constrained. The minimum 90% confidence-level upper limits within the above-mentioned mass ranges are <math><mrow><msub><mrow><mover><mrow><mi>\u03c3</mi></mrow><mrow><mo>\u00af</mo></mrow></mover></mrow><mrow><mi>e</mi></mrow></msub><mo>=</mo><mn>8.7</mn><mo>\u00d7</mo><msup><mrow><mn>10</mn></mrow><mrow><mo>\u2212</mo><mn>34</mn></mrow></msup><mtext> </mtext><mtext> </mtext><msup><mrow><mi>cm</mi></mrow><mrow><mn>2</mn></mrow></msup></mrow></math>, <math><mrow><mi>\u03f5</mi><mo>=</mo><mn>3.3</mn><mo>\u00d7</mo><msup><mrow><mn>10</mn></mrow><mrow><mo>\u2212</mo><mn>14</mn></mrow></msup></mrow></math>, and <math><mrow><msub><mrow><mi>g</mi></mrow><mrow><mi>a</mi><mi>e</mi></mrow></msub><mo>=</mo><mn>1.0</mn><mo>\u00d7</mo><msup><mrow><mn>10</mn></mrow><mrow><mo>\u2212</mo><mn>9</mn></mrow></msup></mrow></math>."
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