Mu2e Run I Sensitivity Projections for the Neutrinoless <em>μ</em><sup>−</sup> → <em>e</em><sup>−</sup> Conversion Search in Aluminum
The Mu2e experiment at Fermilab will search for the neutrinoless <inline-formula><math display="inline"><semantics><mrow><msup><mi>μ</mi><mo>−</mo></msup><mo>→</mo><msup><mi>e</mi><mo>−</mo&g...
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MDPI AG
2023-01-01
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| Online Access: | https://www.mdpi.com/2218-1997/9/1/54 |
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| author | Mu2e Collaboration |
| author_facet | Mu2e Collaboration |
| author_sort | Mu2e Collaboration |
| collection | DOAJ |
| description | The Mu2e experiment at Fermilab will search for the neutrinoless <inline-formula><math display="inline"><semantics><mrow><msup><mi>μ</mi><mo>−</mo></msup><mo>→</mo><msup><mi>e</mi><mo>−</mo></msup></mrow></semantics></math></inline-formula> conversion in the field of an aluminum nucleus. The Mu2e data-taking plan assumes two running periods, Run I and Run II, separated by an approximately two-year-long shutdown. This paper presents an estimate of the expected Mu2e Run I search sensitivity and includes a detailed discussion of the background sources, uncertainties of their prediction, analysis procedures, and the optimization of the experimental sensitivity. The expected Run I <inline-formula><math display="inline"><semantics><mrow><mn>5</mn><mi>σ</mi></mrow></semantics></math></inline-formula> discovery sensitivity is <inline-formula><math display="inline"><semantics><mrow><msub><mi>R</mi><mrow><mi>μ</mi><mi>e</mi></mrow></msub><mo>=</mo><mn>1.2</mn><mo>×</mo><msup><mn>10</mn><mrow><mo>−</mo><mn>15</mn></mrow></msup></mrow></semantics></math></inline-formula>, with a total expected background of <inline-formula><math display="inline"><semantics><mrow><mn>0.11</mn><mo>±</mo><mn>0.03</mn></mrow></semantics></math></inline-formula> events. In the absence of a signal, the expected upper limit is <inline-formula><math display="inline"><semantics><mrow><msub><mi>R</mi><mrow><mi>μ</mi><mi>e</mi></mrow></msub><mo><</mo><mn>6.2</mn><mo>×</mo><msup><mn>10</mn><mrow><mo>−</mo><mn>16</mn></mrow></msup></mrow></semantics></math></inline-formula> at 90% CL. This represents a three order of magnitude improvement over the current experimental limit of <inline-formula><math display="inline"><semantics><mrow><msub><mi>R</mi><mrow><mi>μ</mi><mi>e</mi></mrow></msub><mo><</mo><mn>7</mn><mo>×</mo><msup><mn>10</mn><mrow><mo>−</mo><mn>13</mn></mrow></msup></mrow></semantics></math></inline-formula> at 90% CL set by the SINDRUM II experiment. |
| first_indexed | 2024-03-09T11:05:12Z |
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| id | doaj.art-799e32f919544e68ab9a3bed0c7bc892 |
| institution | Directory Open Access Journal |
| issn | 2218-1997 |
| language | English |
| last_indexed | 2024-03-09T11:05:12Z |
| publishDate | 2023-01-01 |
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| spelling | doaj.art-799e32f919544e68ab9a3bed0c7bc8922023-12-01T00:59:34ZengMDPI AGUniverse2218-19972023-01-01915410.3390/universe9010054Mu2e Run I Sensitivity Projections for the Neutrinoless <em>μ</em><sup>−</sup> → <em>e</em><sup>−</sup> Conversion Search in AluminumMu2e Collaboration0Fermi National Accelerator Laboratory, Batavia, IL 60510, USAThe Mu2e experiment at Fermilab will search for the neutrinoless <inline-formula><math display="inline"><semantics><mrow><msup><mi>μ</mi><mo>−</mo></msup><mo>→</mo><msup><mi>e</mi><mo>−</mo></msup></mrow></semantics></math></inline-formula> conversion in the field of an aluminum nucleus. The Mu2e data-taking plan assumes two running periods, Run I and Run II, separated by an approximately two-year-long shutdown. This paper presents an estimate of the expected Mu2e Run I search sensitivity and includes a detailed discussion of the background sources, uncertainties of their prediction, analysis procedures, and the optimization of the experimental sensitivity. The expected Run I <inline-formula><math display="inline"><semantics><mrow><mn>5</mn><mi>σ</mi></mrow></semantics></math></inline-formula> discovery sensitivity is <inline-formula><math display="inline"><semantics><mrow><msub><mi>R</mi><mrow><mi>μ</mi><mi>e</mi></mrow></msub><mo>=</mo><mn>1.2</mn><mo>×</mo><msup><mn>10</mn><mrow><mo>−</mo><mn>15</mn></mrow></msup></mrow></semantics></math></inline-formula>, with a total expected background of <inline-formula><math display="inline"><semantics><mrow><mn>0.11</mn><mo>±</mo><mn>0.03</mn></mrow></semantics></math></inline-formula> events. In the absence of a signal, the expected upper limit is <inline-formula><math display="inline"><semantics><mrow><msub><mi>R</mi><mrow><mi>μ</mi><mi>e</mi></mrow></msub><mo><</mo><mn>6.2</mn><mo>×</mo><msup><mn>10</mn><mrow><mo>−</mo><mn>16</mn></mrow></msup></mrow></semantics></math></inline-formula> at 90% CL. This represents a three order of magnitude improvement over the current experimental limit of <inline-formula><math display="inline"><semantics><mrow><msub><mi>R</mi><mrow><mi>μ</mi><mi>e</mi></mrow></msub><mo><</mo><mn>7</mn><mo>×</mo><msup><mn>10</mn><mrow><mo>−</mo><mn>13</mn></mrow></msup></mrow></semantics></math></inline-formula> at 90% CL set by the SINDRUM II experiment.https://www.mdpi.com/2218-1997/9/1/54lepton flavor violationLFVmuon conversion |
| spellingShingle | Mu2e Collaboration Mu2e Run I Sensitivity Projections for the Neutrinoless <em>μ</em><sup>−</sup> → <em>e</em><sup>−</sup> Conversion Search in Aluminum Universe lepton flavor violation LFV muon conversion |
| title | Mu2e Run I Sensitivity Projections for the Neutrinoless <em>μ</em><sup>−</sup> → <em>e</em><sup>−</sup> Conversion Search in Aluminum |
| title_full | Mu2e Run I Sensitivity Projections for the Neutrinoless <em>μ</em><sup>−</sup> → <em>e</em><sup>−</sup> Conversion Search in Aluminum |
| title_fullStr | Mu2e Run I Sensitivity Projections for the Neutrinoless <em>μ</em><sup>−</sup> → <em>e</em><sup>−</sup> Conversion Search in Aluminum |
| title_full_unstemmed | Mu2e Run I Sensitivity Projections for the Neutrinoless <em>μ</em><sup>−</sup> → <em>e</em><sup>−</sup> Conversion Search in Aluminum |
| title_short | Mu2e Run I Sensitivity Projections for the Neutrinoless <em>μ</em><sup>−</sup> → <em>e</em><sup>−</sup> Conversion Search in Aluminum |
| title_sort | mu2e run i sensitivity projections for the neutrinoless em μ em sup sup em e em sup sup conversion search in aluminum |
| topic | lepton flavor violation LFV muon conversion |
| url | https://www.mdpi.com/2218-1997/9/1/54 |
| work_keys_str_mv | AT mu2ecollaboration mu2erunisensitivityprojectionsfortheneutrinolessemmemsupsupemeemsupsupconversionsearchinaluminum |