Belle II Document Server 8 records found  Search took 0.00 seconds. 
1. A test of lepton flavor universality with a measurement of $R(D^{*})$ using hadronic $B$ tagging at the Belle~II experiment / The Belle II Collaboration [BELLE2-NOTE-PH-2022-032] [BELLE2-PUB-DRAFT-2023-015] [BELLE2-PUB-PH-2024-001]
05 January 2024

The ratio of branching fractions $R(D^{*}) = \mathcal{B}(\overline{B} \rightarrow D^{*} \tau^{-} \overline{\nu}_{\tau})$/$\mathcal{B} (\overline{B} \rightarrow D^{*} \ell^{-} \overline{\nu}_{\ell})$, where $\ell$ is an electron or muon, is measured using a Belle~II data sample with an integrated luminosity of $189~\mathrm{fb}^{-1}$ at the SuperKEKB asymmetric-energy $e^{+} e^{-}$ collider. [...]
arXiv:2401.02840: Download fulltextPDF (additional files);
2. Recent Belle II results on semileptonic B decays and tests of lepton-flavor universality / Kazuki Kojima [BELLE2-TALK-DRAFT-2023-099] [BELLE2-TALK-CONF-2023-097] 15 minutes (12 minutes presentation + 3 minutes Q&A) https://www.leptonphoton2023.org/
18 July 2023
/ Lepton Photon 2023
Semileptonic $B$-meson decays allow for determining the magnitudes of the CKM matrix parameters $|V_{cb}|$ and $|V_{ub}|$, two fundamental parameters of the SM flavor sector and to probe the excess rate of semitauonic $B$ decays, which has been consistently above expectations in recent years. [...]
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3. Belle~II results related to $b \to c$ anomalies / Kazuki Kojima [BELLE2-TALK-CONF-2023-025] [BELLE2-CONF-PROC-2023-029] Contribution to the 2023 Electroweak session of the 57th Rencontres de Moriond
17 July 2023

We report two new 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. [...]
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4. Recent Belle II results related to flavor anomalies / Kazuki Kojima [BELLE2-NOTE-PH-2021-042] [BELLE2-NOTE-PH-2022-031] [BELLE2-TALK-DRAFT-2023-028] [BELLE2-TALK-CONF-2023-027] 15 minutes (13 minutes presentation + 2 minutes Q&A) https://indico.in2p3.fr/event/28466/
29 March 2023
/ International Conference on the Physics of the Two Infinities
Persistent anomalies reported by various experiments in $b \rightarrow c$ and $b \rightarrow s\ell\ell$ transitions hint at possible violation of lepton-flavor universality. [...]
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5. Belle II results related to b→c anomalies / Kazuki Kojima [BELLE2-NOTE-PH-2021-042] [BELLE2-NOTE-PH-2022-031 ] [BELLE2-TALK-DRAFT-2023-027] [BELLE2-TALK-CONF-2023-025] 7 minutes (5 minutes presentation + 2 minutes Q&A) https://moriond.in2p3.fr/2023/EW/
20 March 2023
/ 57th Rencontres de Moriond 2023: Electroweak Interactions & Unified Theories
Recent Belle II results of light-lepton flavor universality tests for b→c anomalies using semileptonic B decays are shown. [...]
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6. $R(D^{*})$ measurement using the hadronic tag algorithm with $189~\mathrm{fb}^{-1}$ data at the Belle~II experiment / Kazuki Kojima ; Toru Iijima ; Qi-Dong Zhou ; Kodai Matsuoka ; et al [BELLE2-NOTE-PH-2022-032] [BELLE2-TALK-DRAFT-2023-035] [BELLE2-TALK-CONF-2023-024] 20 minutes (15 minutes presentation + 5 minutes Q&A); https://www.jps.or.jp/activities/meetings/past.php; https://kds.kek.jp/event/45609/
22 March 2023
/ The 2023 Spring Meeting of the Physical Society of Japan
In the semileptonic decay of 𝐵 mesons, the global average of $R(D^{*})$ measurement deviates from the Standard Model by more than $3\sigma$. [...]
Slide in Japanese: Download fulltextPDF;
7. $R(D^{*})$ measurement using the hadronic tag algorithm at the Belle II experiment / Kazuki Kojima ; Toru Iijima ; Qi-Dong Zhou ; Kodai Matsuoka ; et al [BELLE2-NOTE-PH-2022-032] [BELLE2-TALK-DRAFT-2022-137] [BELLE2-TALK-CONF-2022-111] 20 minutes (15 minutes presentation + 5 minutes Q&A) ; https://www.jps.or.jp/english/meetings-and-awards/autumn/autumn-meeting-index.html ; https://kds.kek.jp/event/43097/
06 September 2022
/ The 2022 Autumn Meeting of the Physical Society of Japan
In the semileptonic decay of $B$ mesons, the global average of $R(D^{*})$ measurement deviates from the Standard Model by $3.3\sigma$. [...]
Belle II Note: Download fulltextPDF; Slide in Japanese: Download fulltextPDF;
8. Measurements of R(D(*)) and other missing energy decays at Belle II / Sophie Hollitt [BELLE2-CONF-PROC-2018-026] for ICHEP2018
27 November 2018

The Belle II experiment and SuperKEKB energy-asymmetric $e^+e^-$ collider have already successfully completed Phase 1 and 2 of commissioning with first collisions seen in April 2018. [...]
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