Search for lepton-flavor-violating τ- RIGHTWARDS ARROW μ-μ+μ- decays at Belle II

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F24%3A10494175" target="_blank" >RIV/00216208:11320/24:10494175 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=uS~Zp8Fdye" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=uS~Zp8Fdye</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1007/JHEP09(2024)062" target="_blank" >10.1007/JHEP09(2024)062</a>

Result language
angličtina
Original language name
Search for lepton-flavor-violating τ- RIGHTWARDS ARROW μ-μ+μ- decays at Belle II
Original language description
We present the result of a search for the charged-lepton-flavor violating decayτ- RIGHTWARDS ARROW μ-μ+μ- using a 424 fb-1 sample of data recorded by the Belle II experiment at theSuperKEKB e+e- collider. The selection of e+e- RIGHTWARDS ARROW τ+τ- events is based on an inclusivereconstruction of the non-signal tau decay, and on a boosted decision tree to suppressbackground. We observe one signal candidate, which is compatible with the expectationfrom background processes. We set a 90% confidence level upper limit of 1.9 x 10-8 on thebranching fraction of the τ- RIGHTWARDS ARROW μ-μ+μ- decay, which is the most stringent bound to date.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
—
OECD FORD branch
10300 - Physical sciences

Project
<a href="/en/project/GA22-18469S" target="_blank" >GA22-18469S: Studies of the Beyond Standard Model phenomena in the flavor sector with the Belle II Experiment</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2024
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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