Search for Bs0 → l∓τ± with the semi-leptonic tagging method at Belle

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F23%3A10476508" target="_blank" >RIV/00216208:11320/23:10476508 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=q8zlnra31S" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=q8zlnra31S</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1007/JHEP08(2023)178" target="_blank" >10.1007/JHEP08(2023)178</a>

Result language
angličtina
Original language name
Search for Bs0 → l∓τ± with the semi-leptonic tagging method at Belle
Original language description
We present a search for the lepton-flavor-violating decays B-s(0) -> l(-/+) tau(+/-), where l = e, mu, using the full data sample of 121 fb(-1) collected at the Gamma(5S) resonance with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. We use B-s(0)(B) over bar (0)(s) events in which one B-s(0) meson is reconstructed in a semileptonic decay mode and the other in the signal mode. We find no evidence for B-0(s) -> l(-/+) tau(+/-) decays and set upper limits on their branching fractions at 90% confidence level as B(B-s(0) -> e(-/+)tau(+/-)) < 14 x 10(-4) and B(B-s(0) -> mu(-/+)tau(+/-)) < 7.3x10(-4). Our result represents the first upper limit on the B-0(s) -> e(-/+)tau(+/-) decay rate.
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
2023
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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