We report a search for light dark matter produced through the cascading decay of mesons, which are created as a result of inelastic collisions between cosmic rays and Earth’s atmosphere. We introduce a new and general framework, publicly accessible, designed to address boosted dark matter specifically, with which a full and dedicated simulation including both elastic and quasielastic processes of Earth attenuation effect on the dark matter particles arriving at the detector is performed. In the PandaX-4T commissioning data of exposure, no significant excess over background is observed. The first constraints on the interaction between light dark matter generated in the atmosphere and nucleus through a light scalar mediator are obtained. The lowest excluded cross section is set at for a dark matter mass of and mediator mass of . The lowest upper limit of to the dark matter decay branching ratio is .
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"titles": [
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"title": "Search for Light Dark Matter from the Atmosphere in PandaX-4T"
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"journal_title": "Physical Review Letters",
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"statement": "Published by the American Physical Society",
"year": "2023"
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"value": "We report a search for light dark matter produced through the cascading decay of <math><mi>\u03b7</mi></math> mesons, which are created as a result of inelastic collisions between cosmic rays and Earth\u2019s atmosphere. We introduce a new and general framework, publicly accessible, designed to address boosted dark matter specifically, with which a full and dedicated simulation including both elastic and quasielastic processes of Earth attenuation effect on the dark matter particles arriving at the detector is performed. In the PandaX-4T commissioning data of <math><mrow><mn>0.63</mn><mtext> </mtext><mtext> </mtext><mi>tonne</mi><mo>\u00b7</mo><mi>year</mi></mrow></math> exposure, no significant excess over background is observed. The first constraints on the interaction between light dark matter generated in the atmosphere and nucleus through a light scalar mediator are obtained. The lowest excluded cross section is set at <math><mrow><mn>5.9</mn><mo>\u00d7</mo><msup><mrow><mn>10</mn></mrow><mrow><mo>\u2212</mo><mn>37</mn></mrow></msup><mtext> </mtext><mtext> </mtext><msup><mrow><mi>cm</mi></mrow><mrow><mn>2</mn></mrow></msup></mrow></math> for a dark matter mass of <math><mrow><mn>0.1</mn><mtext> </mtext><mtext> </mtext><mi>MeV</mi><mo>/</mo><msup><mrow><mi>c</mi></mrow><mrow><mn>2</mn></mrow></msup></mrow></math> and mediator mass of <math><mrow><mn>300</mn><mtext> </mtext><mtext> </mtext><mi>MeV</mi><mo>/</mo><msup><mrow><mi>c</mi></mrow><mrow><mn>2</mn></mrow></msup></mrow></math>. The lowest upper limit of <math><mi>\u03b7</mi></math> to the dark matter decay branching ratio is <math><mn>1.6</mn><mo>\u00d7</mo><msup><mn>10</mn><mrow><mo>\u2212</mo><mn>7</mn></mrow></msup></math>."
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