JSNS $$^2$$ (J-PARC Sterile Neutrino Search at J-PARC Spallation Neutron Source) is an experiment that searches for sterile neutrinos via the observation of $$\bar{\nu }_{\mu } \rightarrow \bar{\nu }_{e}$$ appearance oscillations using muon decay-at-rest neutrinos. The JSNS $$^2$$ experiment performed data taking from 2021. In this manuscript, a study of the accidental background is presented. The rate of the accidental background is ( $$9.29\pm 0.39) \times 10^{-8}$$ /spill with 0.75 MW beam power and comparable to the expected number of signal events.
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"value": "JSNS $$^2$$ <math> <msup> <mrow></mrow> <mn>2</mn> </msup> </math> (J-PARC Sterile Neutrino Search at J-PARC Spallation Neutron Source) is an experiment that searches for sterile neutrinos via the observation of $$\\bar{\\nu }_{\\mu } \\rightarrow \\bar{\\nu }_{e}$$ <math> <mrow> <msub> <mover> <mrow> <mi>\u03bd</mi> </mrow> <mrow> <mo>\u00af</mo> </mrow> </mover> <mi>\u03bc</mi> </msub> <mo>\u2192</mo> <msub> <mover> <mrow> <mi>\u03bd</mi> </mrow> <mrow> <mo>\u00af</mo> </mrow> </mover> <mi>e</mi> </msub> </mrow> </math> appearance oscillations using muon decay-at-rest neutrinos. The JSNS $$^2$$ <math> <msup> <mrow></mrow> <mn>2</mn> </msup> </math> experiment performed data taking from 2021. In this manuscript, a study of the accidental background is presented. The rate of the accidental background is ( $$9.29\\pm 0.39) \\times 10^{-8}$$ <math> <mrow> <mrow> <mn>9.29</mn> <mo>\u00b1</mo> <mn>0.39</mn> <mo>)</mo> <mo>\u00d7</mo> </mrow> <msup> <mn>10</mn> <mrow> <mo>-</mo> <mn>8</mn> </mrow> </msup> </mrow> </math> /spill with 0.75 MW beam power and comparable to the expected number of signal events."
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