We report the first search for the decay, which is forbidden by Lorentz invariance, using the data from 2016 to 2018 at the J-PARC KOTO experiment. With a single event sensitivity of , no candidate event was observed in the signal region. The upper limit on the branching fraction was set to be at the 90% confidence level.
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{
"source": "APS",
"value": "We report the first search for the <math><msub><mi>K</mi><mi>L</mi></msub><mo>\u2192</mo><msup><mi>\u03c0</mi><mn>0</mn></msup><mi>\u03b3</mi></math> decay, which is forbidden by Lorentz invariance, using the data from 2016 to 2018 at the J-PARC KOTO experiment. With a single event sensitivity of <math><mo>(</mo><mn>7.1</mn><mo>\u00b1</mo><mn>0.</mn><msub><mn>3</mn><mrow><mi>stat</mi></mrow></msub><mo>\u00b1</mo><mn>1.</mn><msub><mn>6</mn><mrow><mi>syst</mi></mrow></msub><mo>)</mo><mo>\u00d7</mo><msup><mn>10</mn><mrow><mo>\u2212</mo><mn>8</mn></mrow></msup></math>, no candidate event was observed in the signal region. The upper limit on the branching fraction was set to be <math><mn>1.7</mn><mo>\u00d7</mo><msup><mn>10</mn><mrow><mo>\u2212</mo><mn>7</mn></mrow></msup></math> at the 90% confidence level."
}
],
"imprints": [
{
"date": "2020-09-28",
"publisher": "APS"
}
]
}