Gaudino, G. (2025) Missing Energy decays of a B meson at Belle II. Il nuovo cimento C, 48 (3). pp. 1-5. ISSN 1826-9885
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Abstract
We present recent results of missing energy decays of B-mesons based on data collected at the Υ(4S) resonance by the Belle II experiment. This report includes two key analyses focusing on τ over μ/e lepton universality. The first is the measurement of the branching-fraction ratio R(D∗ τ/ )=B(B → D∗τ−ντ)/B(B → D∗−ν )using hadronic tagging. The second is the first measurement of the inclusive ratio R(Xτ/)=B(B → Xτ−ντ)/B(B → X−ν ). We also present the branching fraction ratios R(Xe/μ)=B(B → Xe−νe)/B(B → Xμ−νμ). Finally, we present a simultaneous measurement of the magnitude of the CKM matrix |Vub| using the semileptonic b → u transitions: B0 → π−+ν and B− → ρ0+ν. All results are consistent with the corresponding Standard Model predictions.
| Item Type: | Article |
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| Subjects: | 500 Scienze naturali e Matematica > 530 Fisica |
| Depositing User: | Marina Spanti |
| Date Deposited: | 10 Jul 2025 14:27 |
| Last Modified: | 10 Jul 2025 14:27 |
| URI: | http://eprints.bice.rm.cnr.it/id/eprint/23645 |
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