We report on the search for the rare decay which is of interest to study C violation in the electromagnetic interaction which would indicate contributions from physics beyond the Standard Model, since the allowed decay via a two-photon intermediate state is strongly suppressed. The experiment has been performed using the WASA-at-COSY installation, located at the COSY accelerator of the Forschungszentrum Jülich, Germany. In total events of the reaction have been recorded at an excess energy of . Based on this data set the C parity violating decay via a single-photon intermediate state has been searched for, resulting in new upper limits of and (), respectively.
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"titles": [
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"title": "Search for Violation in the Decay \u2192 with WASA-at-COSY"
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"abstracts": [
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"source": "Elsevier",
"value": "We report on the search for the rare decay <math><mi>\u03b7</mi><mo>\u2192</mo><msup><mrow><mi>\u03c0</mi></mrow><mrow><mn>0</mn></mrow></msup><msup><mrow><mtext>e</mtext></mrow><mrow><mo>+</mo></mrow></msup><msup><mrow><mtext>e</mtext></mrow><mrow><mo>\u2212</mo></mrow></msup></math> which is of interest to study C violation in the electromagnetic interaction which would indicate contributions from physics beyond the Standard Model, since the allowed decay via a two-photon intermediate state is strongly suppressed. The experiment has been performed using the WASA-at-COSY installation, located at the COSY accelerator of the Forschungszentrum J\u00fclich, Germany. In total <math><mn>3</mn><mo>\u00d7</mo><msup><mrow><mn>10</mn></mrow><mrow><mn>7</mn></mrow></msup></math> events of the reaction <math><mtext>p</mtext><mtext>d</mtext><msup><mrow><mo>\u2192</mo></mrow><mrow><mn>3</mn></mrow></msup><mtext>He</mtext><mi>\u03b7</mi></math> have been recorded at an excess energy of <math><mi>Q</mi><mo>=</mo><mn>59.8</mn><mspace width=\"0.25em\"></mspace><mtext>MeV</mtext></math>. Based on this data set the C parity violating decay <math><mi>\u03b7</mi><mo>\u2192</mo><msup><mrow><mi>\u03c0</mi></mrow><mrow><mn>0</mn></mrow></msup><msup><mrow><mi>\u03b3</mi></mrow><mrow><mo>\u204e</mo></mrow></msup><mo>\u2192</mo><msup><mrow><mi>\u03c0</mi></mrow><mrow><mn>0</mn></mrow></msup><msup><mrow><mtext>e</mtext></mrow><mrow><mo>+</mo></mrow></msup><msup><mrow><mtext>e</mtext></mrow><mrow><mo>\u2212</mo></mrow></msup></math> via a single-photon intermediate state has been searched for, resulting in new upper limits of <math><mi>\u0393</mi><mrow><mo>(</mo><mi>\u03b7</mi><mo>\u2192</mo><msup><mrow><mi>\u03c0</mi></mrow><mrow><mn>0</mn></mrow></msup><msup><mrow><mtext>e</mtext></mrow><mrow><mo>+</mo></mrow></msup><msup><mrow><mtext>e</mtext></mrow><mrow><mo>\u2212</mo></mrow></msup><mo>)</mo></mrow><mo>/</mo><mi>\u0393</mi><mrow><mo>(</mo><mi>\u03b7</mi><mo>\u2192</mo><msup><mrow><mi>\u03c0</mi></mrow><mrow><mo>+</mo></mrow></msup><msup><mrow><mi>\u03c0</mi></mrow><mrow><mo>\u2212</mo></mrow></msup><msup><mrow><mi>\u03c0</mi></mrow><mrow><mn>0</mn></mrow></msup><mo>)</mo></mrow><mo><</mo><mn>3.28</mn><mo>\u00d7</mo><msup><mrow><mn>10</mn></mrow><mrow><mo>\u2212</mo><mn>5</mn></mrow></msup></math> and <math><mi>\u0393</mi><mrow><mo>(</mo><mi>\u03b7</mi><mo>\u2192</mo><msup><mrow><mi>\u03c0</mi></mrow><mrow><mn>0</mn></mrow></msup><msup><mrow><mtext>e</mtext></mrow><mrow><mo>+</mo></mrow></msup><msup><mrow><mtext>e</mtext></mrow><mrow><mo>\u2212</mo></mrow></msup><mo>)</mo></mrow><mo>/</mo><mi>\u0393</mi><mrow><mo>(</mo><mi>\u03b7</mi><mo>\u2192</mo><mtext>all</mtext><mo>)</mo></mrow><mo><</mo><mn>7.5</mn><mo>\u00d7</mo><msup><mrow><mn>10</mn></mrow><mrow><mo>\u2212</mo><mn>6</mn></mrow></msup></math> (<math><mtext>CL</mtext><mo>=</mo><mn>90</mn><mtext>%</mtext></math>), respectively."
}
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