Search for an eV-Scale Sterile Neutrino Using Improved High-Energy <math display="inline"><mrow><msub><mrow><mi>ν</mi></mrow><mrow><mi>μ</mi></mrow></msub></mrow></math> Event Reconstruction in IceCube

de Wasseige, Gwenhaël;Genton, Eliot;Kruiswijk, Karlijn;Lamoureux, Mathieu;IceCube;et.al.
(2024) Physical Review Letters — Vol. 133 (2024)

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Abstract
This Letter presents the result of a <math display="inline"><mrow><mn>3</mn><mo>+</mo><mn>1</mn></mrow></math> sterile neutrino search using 10.7 yr of IceCube data. We analyze atmospheric muon neutrinos that traverse the Earth with energies ranging from 0.5 to 100 TeV, incorporating significant improvements in modeling neutrino flux and detector response compared to earlier studies. Notably, for the first time, we categorize data into starting and throughgoing events, distinguishing neutrino interactions with vertices inside or outside the instrumented volume, to improve energy resolution. The best-fit point for a <math display="inline"><mrow><mn>3</mn><mo>+</mo><mn>1</mn></mrow></math> model is found to be at <math display="inline"><mrow><msup><mrow><mi>sin</mi></mrow><mrow><mn>2</mn></mrow></msup><mo stretchy="false">(</mo><mn>2</mn><msub><mrow><mi>θ</mi></mrow><mrow><mn>24</mn></mrow></msub><mo stretchy="false">)</mo><mo>=</mo><mn>0.16</mn></mrow></math> and <math display="inline"><mi mathvariant="normal">Δ</mi><msubsup><mi>m</mi><mn>41</mn><mn>2</mn></msubsup><mo>=</mo><mn>3.5</mn><mtext> </mtext><mtext> </mtext><msup><mrow><mi>eV</mi></mrow><mrow><mn>2</mn></mrow></msup></math>, which agrees with previous iterations of this Letter. The result is consistent with the null hypothesis of no sterile neutrinos with a <math display="inline"><mi>p</mi></math> value of 3.1%.
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de Wasseige, G., Genton, E., Kruiswijk, K., Lamoureux, M., Lazar, J., Raab, C., Myhr, P., Vereecken, M., (IceCube Collaboration)∥, IceCube, & et al. (2024). Search for an eV-Scale Sterile Neutrino Using Improved High-Energy <math display=“inline”><mrow><msub><mrow><mi>ν</mi></mrow><mrow><mi>μ</mi></mrow></msub></mrow></math> Event Reconstruction in IceCube. Physical Review Letters, 133. https://doi.org/10.1103/PhysRevLett.133.201804 (Original work published 2024)