Lepton universality tests and searches for new physics in charged current decays at Belle II
Sumitted to PubDB: 2024-01-10
Category: Proceeding, Visibility: Public
Tags:
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Authors |
Henrik Junkerkalefeld
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Date |
2023-12-29 |
Belle II Number |
BELLE2-CONF-PROC-2023-049 |
Abstract |
We present recent tests of lepton universality as crucial probes of the Standard Model in semileptonic -meson decays at Belle II. All presented analyses use a data sample collected at the resonance by the Belle II experiment corresponding to an integrated luminosity of . We report three analyses that probe light-lepton universality: The first measurement of a complete set of five angular asymmetries using decays, followed by a measurement of the forward-backward asymmetry in untagged decays, and finally, measurements of the branching-fraction ratios , using the same untagged data set, along with the first measurement of the inclusive light-lepton ratio . Furthermore, we present two tests of heavy-to-light lepton universality. In the first test, we report the measurement of the branching-fraction ratio using hadronic tagging. In the second test, we present the first measurement of the inclusive ratio . All presented results are consistent with their corresponding Standard Model predictions and, where applicable, with the experimental world averages. |
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