| Title: | Search for lepton-flavor-violating ▫$\tau^- \to \mu^- \mu^+ \mu^-$▫ decays at Belle II |
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| Authors: | ID Adachi, Ichiro (Author)
ID Borah, Jyotirmoi, Institut "Jožef Stefan" (Author)
ID Bračko, Marko, Institut "Jožef Stefan" (Author)
ID Feichtinger, Paul, Institut "Jožef Stefan" (Author)
ID Ganiev, Eldar, Institut "Jožef Stefan" (Author)
ID Korpar, Samo, Institut "Jožef Stefan" (Author)
ID Križan, Peter, Institut "Jožef Stefan" (Author)
ID Mrvar, Manca (Author)
ID Pestotnik, Rok, Institut "Jožef Stefan" (Author)
ID Podobnik, Tomaž, Institut "Jožef Stefan" (Author)
ID Starič, Marko, Institut "Jožef Stefan" (Author)
ID Šantelj, Luka, Institut "Jožef Stefan" (Author)
ID Zhukova, Valentina (Author)
ID Žlebčík, Radek (Author), et al. |
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| Files: |  URL - Source URL, visit https://link.springer.com/article/10.1007/JHEP09(2024)062
 PDF - Presentation file, download (701,08 KB)
MD5: 29CE0EE3D1B7ADC5308D6389016586F1
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| Language: | English |
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| Typology: | 1.01 - Original Scientific Article |
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| Organization: |  IJS - Jožef Stefan Institute
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| Abstract: | We present the result of a search for the charged-lepton-flavor violating decay τ− → μ−μ+μ− using a 424 fb−1 sample of data recorded by the Belle II experiment at the SuperKEKB e+e− collider. The selection of e+e− → τ+τ− events is based on an inclusive reconstruction of the non-signal tau decay, and on a boosted decision tree to suppress background. We observe one signal candidate, which is compatible with the expectation from background processes. We set a 90% confidence level upper limit of 1.9 × 10−8 on the branching fraction of the τ− → μ−μ+μ− decay, which is the most stringent bound to date. |
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| Keywords: | flavour physics, tau physics, e+-e− Experiments |
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| Publication status: | Published |
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| Publication version: | Version of Record |
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| Submitted for review: | 15.05.2024 |
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| Article acceptance date: | 31.07.2024 |
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| Publication date: | 11.09.2024 |
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| Publisher: | SISSA |
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| Year of publishing: | 2024 |
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| Number of pages: | str. 1-19 |
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| Numbering: | Vol. 2024, article no. 62 |
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| Source: | Italija |
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| PID: | 20.500.12556/DiRROS-29169  |
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| UDC: | 539 |
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| ISSN on article: | 1029-8479 |
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| DOI: | 10.1007/JHEP09(2024)062 |
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| COBISS.SI-ID: | 273762819 |
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| Copyright: | © The Authors. |
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| Note: | Nasl. z nasl. zaslona;
Opis vira z dne 31. 3. 2026;
Avtorji iz Slovenije: Jyotirmoi Borah, Marko Bračko, Paul Feichtinger, Eldar Ganiev, Samo Korpar, Peter Križan, Manca Mrvar, Rok Pestotnik, Tomaž Podobnik, Marko Starič, Luka Šantelj, Valentina I. Zhukova;
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| Publication date in DiRROS: | 22.04.2026 |
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| Views: | 44 |
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| Downloads: | 22 |
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