Search for B0 RIGHTWARDS ARROW K*0τ+τ- Decays at the Belle II Experiment

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F25%3A10511024" target="_blank" >RIV/00216208:11320/25:10511024 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=q.d5v521Y5" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=q.d5v521Y5</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1103/v1q3-9dy8" target="_blank" >10.1103/v1q3-9dy8</a>

Result language
angličtina
Original language name
Search for B0 RIGHTWARDS ARROW K*0τ+τ- Decays at the Belle II Experiment
Original language description
We present a search for the rare flavor-changing neutral-current decay B-0 -> K-*0 tau(+)tau(-) with data collected by the Belle II experiment at the SuperKEKB electron-positron collider. The analysis uses a 365 fb(-1) data sample recorded at the center-of-mass energy of the (sic)(4S) resonance. One of the B mesons produced in the (sic)(4S) -> B-0(B) over bar (0) process is fully reconstructed in a hadronic decay mode, while its companion B meson is required to decay into a K*(0) and two t leptons of opposite charge. The t leptons are reconstructed in final states with a single electron, muon, charged pion or charged. meson, and additional neutrinos. We set an upper limit on the branching fraction of B(B-0 -> K-*0 tau(+)tau(-)) < 1.8 x 10(-3) at the 90% confidence level, which is the most stringent constraint reported 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
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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