000003724 001__ 3724
000003724 005__ 20230716133600.0
000003724 037__ $$aBELLE2-CONF-DRAFT-2023-017
000003724 041__ $$aeng
000003724 088__ $$aBELLE2-TALK-CONF-2023-025
000003724 088__ $$aBELLE2-TALK-DRAFT-2023-027
000003724 088__ $$aBELLE2-PUB-DRAFT-2022-012
000003724 088__ $$aBELLE2-PUB-DRAFT-2023-007
000003724 100__ $$aKazuki Kojima
000003724 245__ $$aBelle~II results related to $b \to c$ anomalies
000003724 260__ $$a$$c2023-07-10
000003724 300__ $$a4
000003724 500__ $$aPage limit: 4 pages https://moriond.in2p3.fr/2023/EW/Contributions.html
000003724 520__ $$aWe report two novel measurements for tests of lepton flavor universality between electrons and muons using semileptonic $B$ decays with a data set of $189~\mathrm{fb}^{-1}$ collected at the Belle II experiment between 2019 and 2021. Firstly, we find a ratio of inclusive branching ratios at $R(X_{e/\mu}) \equiv \mathcal{B}(\overline{B} \rightarrow Xe^{-}\overline{\nu}_{e})/\mathcal{B}(\overline{B} \rightarrow X\mu^{-}\overline{\nu}_{\mu}) = 1.007 \pm 0.009 (\mathrm{stat.}) \pm 0.019 (\mathrm{syst.})$. This inclusive measurement leads to the most precise universality test based on branching ratios. The measured $R(X_{e/\mu})$ is consistent with the Standard-Model prediction. Secondly, we measure a comprehensive set of five angular asymmetries of $\overline{B}^{0} \rightarrow {D^{*}}^{+}\ell^{-}\overline{\nu}_{\ell}$ decays and obtain agreements with the Standard Model for the asymmetries at a $p$-value more than $13\%$. From both tests, no evidence of the universality violation is found.
000003724 6531_ $$aSemileptonic
000003724 6531_ $$aSemileptonic B decays
000003724 6531_ $$aR(X)
000003724 6531_ $$aAngular asymmetry
000003724 6531_ $$aAfb
000003724 6531_ $$aLFV
000003724 6531_ $$aLFUV
000003724 6531_ $$aFEI
000003724 6531_ $$aMoriond
000003724 6531_ $$aMoriondEW
000003724 6531_ $$aMoriondEWK
000003724 6531_ $$aMoriond EW
000003724 6531_ $$aMoriond EWK
000003724 6531_ $$aMoriond2023
000003724 8560_ $$fkojima@hepl.phys.nagoya-u.ac.jp
000003724 8564_ $$uhttps://docs.belle2.org/record/3724/files/BELLE2-CONF-DRAFT-2023-017Ver1.pdf$$yVersion1
000003724 8564_ $$uhttps://docs.belle2.org/record/3724/files/BELLE2-CONF-DRAFT-2023-017Ver2.pdf$$yVersion2
000003724 8564_ $$uhttps://docs.belle2.org/record/3724/files/BELLE2-CONF-DRAFT-2023-017Ver3.pdf$$yVersion3