Search for lepton-flavor-violating tau decays to ℓα at Belle

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F25%3A10510928" target="_blank" >RIV/00216208:11320/25:10510928 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=3LMECwRc9T" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=3LMECwRc9T</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1007/JHEP08(2025)155" target="_blank" >10.1007/JHEP08(2025)155</a>

Result language
angličtina
Original language name
Search for lepton-flavor-violating tau decays to ℓα at Belle
Original language description
We report a search for the lepton-flavor-violating decays tau(+/-) -> & ell;(+/-)alpha (& ell; = e, mu), where alpha is an undetected spin-0 particle, such as an axion-like particle using 736 x 10(6) tau lepton pairs collected by the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. We find no evidence of signal and obtain the most stringent upper limits on the branching fractions at 95% confidence level: B(tau(+/-) -> e(+/-)alpha) < (0.4-6.4) x 10(-4) and B (tau(+/-) -> mu(+/-)alpha) < (0.2-3.5) x 10(-4) at 95% confidence level for an alpha mass in the range 0.0 <= m(alpha) <= 1.6 GeV/c(2).
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
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OECD FORD branch
10300 - Physical sciences

Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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