Determination of |Vub| from simultaneous measurements of untagged B0 → π- l+ νl and B+ → ρ0l+ νl decays

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F25%3A10510171" target="_blank" >RIV/00216208:11320/25:10510171 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=Sd.rvU7HGh" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=Sd.rvU7HGh</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1103/jnwn-ts6q" target="_blank" >10.1103/jnwn-ts6q</a>

Result language
angličtina
Original language name
Determination of |Vub| from simultaneous measurements of untagged B0 → π- l+ νl and B+ → ρ0l+ νl decays
Original language description
We present a measurement of |V-ub| from a simultaneous study of the charmless semileptonic decays B-0 -> pi(-) l(+) nu(l) and B+ -> rho(0)l(+) nu(l), where l = e, mu. This measurement uses a data sample of 387 million BB meson pairs recorded by the Belle II detector at the SuperKEKB electron-positron collider between 2019 and 2022. The two decays are reconstructed without identifying the partner B mesons. We simultaneously measure the differential branching fractions of B-0 -> pi(-) l(+) nu(l) and B+ -> rho(0)l(+) nu(l) decays as functions of q(2) (momentum transfer squared). From these, we obtain total branching fractions B(B-0 -> pi(-) l(+)nu l) = (1.516 +/- 0.042(stat) +/- 0.059(syst)) x 10(-4) and B(B+ -> rho(0)l(+) nu(l)) = (1.625 +/- 0.079(stat) +/- 0.180(syst)) x 10(-4). By fitting the measured B-0 -> pi(-) l(+) nu(l) partial branching fractions as functions of q(2), together with constraints on the nonperturbative hadronic contribution from lattice QCD calculations, we obtain |V-ub| = (3.93 +/- 0.09 +/- 0.13 +/- 0.19) x 10(-3). Here, the first uncertainty is statistical, the second is systematic, and the third is theoretical.
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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