Search for charged-lepton flavor violation in Υ(2S) → ℓ∓τ± (ℓ = e, μ) decays at Belle

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F24%3A10494180" target="_blank" >RIV/00216208:11320/24:10494180 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=cCSRtgl6K3" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=cCSRtgl6K3</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1007/JHEP02(2024)187" target="_blank" >10.1007/JHEP02(2024)187</a>

Result language
angličtina
Original language name
Search for charged-lepton flavor violation in Υ(2S) → ℓ∓τ± (ℓ = e, μ) decays at Belle
Original language description
We report a search for the charged-lepton flavor violation in Υ(2S) RIGHTWARDS ARROW ℓMINUS-OR-PLUS SIGNτ+-(ℓ = e, μ) decays using a 25 fb-1 Υ(2S) sample collected by the Belle detector at the KEKBe+e- asymmetric-energy collider. We find no evidence for a signal and set upper limits onthe branching fractions (B) at 90% confidence level. We obtain the most stringent upperlimits: B(Υ(2S) RIGHTWARDS ARROW μMINUS-OR-PLUS SIGNτ+-) < 0.23 x 10-6 and B(Υ(2S) RIGHTWARDS ARROW eMINUS-OR-PLUS SIGNτ+-) < 1.12 x 10-6.
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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