Determination of from untagged decays using 2019-2021 Belle~II data
Sumitted to PubDB: 2022-10-11
Category: Conference papers and plots, Visibility: Public
Tags:
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Authors |
Florian Bernlochner,
Jochen Dingfelder,
Svenja Granderath,
Peter Lewis
|
Date |
Oct. 9, 2022 |
Belle II Number |
BELLE2-CONF-PH-2022-017 |
Abstract |
We present an analysis of the charmless semileptonic decay , where , from 198.0 million pairs of mesons recorded by the Belle~II detector at the SuperKEKB electron-positron collider. The decay is reconstructed without identifying the partner meson. The partial branching fractions are measured independently for and as functions of (momentum transfer squared), using 3896 and 5466 decays. The total branching fraction is found to be for decays, where the uncertainties are statistical and systematic, respectively. By fitting the measured partial branching fractions as functions of , together with constraints on the nonperturbative hadronic contribution from lattice QCD calculations, the magnitude of the Cabibbo-Kobayashi-Maskawa matrix element , , is extracted. Here, the first uncertainty is statistical, the second is systematic and the third is theoretical. |
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