H. Shibuya

Determination of $|V_{cb}|$ from $B\to D\ellν$ decays using 2019-2021 Belle II data

Belle II collaboration, F. Abudinén, I. Adachi, K. Adamczyk et autres

We present a determination of the magnitude of the Cabibbo-Kobayashi-Maskawa (CKM) matrix element $V_{cb}$ using $B\to D\ellν$ decays. The result is based on $e^+e^-\toΥ(4S)$ data recorded by the Belle II detector corresponding to 189.2/fb of integrated luminosity. The semileptonic decays $B^0\to D^-(\to …

Measurements of the branching fraction, isospin asymmetry, and lepton-universality ratio in $B \to J/ψK$ decays at Belle II

Belle II Collaboration, F. Abudinén, I. Adachi, R. Adak et autres

We report a study of $B \to J/ψ(\ell^{+}\ell^{-})K$ decays, where $\ell$ represents an electron or a muon, using $e^{+}e^{-}$ collisions at the $Υ(4S)$ resonance. The data were collected by the Belle II experiment at the SuperKEKB asymmetric-energy collider during 2019-2021, corresponding to …

Angular analysis of $B^+ \to ρ^+ρ^0$ decays reconstructed in 2019, 2020, and 2021 Belle II data

Belle II Collaboration, F. Abudinén, I. Adachi, K. Adamczyk et autres

We report on a Belle II measurement of the branching fraction ($\mathcal{B}$), longitudinal polarization fraction ($f_L$), and CP asymmetry ($\mathcal{A}_{CP}$) of $B^+\to ρ^+ρ^0$ decays. We reconstruct $B^+\to ρ^+(\to π^+π^0(\to γγ))ρ^0(\to π^+π^-)$ decays in a sample of SuperKEKB electron-positron collisions collected by the …

Exclusive $B \to X_u \ell ν_\ell$ Decays with Hadronic Full-event-interpretation Tagging in 62.8 fb$^{-1}$ of Belle II Data

Belle II Collaboration, F. Abudinén, I. Adachi, R. Adak et autres

We present a reconstruction in early data of the semileptonic decay $B^+ \to π^0 \ell^+ ν_\ell$, and first results of a reconstruction of the decays $B^+ \to ρ^0 \ell^+ ν_\ell$ and $B^0 \to ρ^- \ell^+ ν_\ell$ in a sample corresponding to 62.8 …

First search for direct $CP$-violating asymmetry in $B^0 \to K^0 π^0$ decays at Belle II

F. Abudinén, I. Adachi, R. Adak, K. Adamczyk et autres

We report on the first measurement of the direct $CP$-violating asymmetry ($\mathcal{A}$) in the charmless decay $B^0 \to K^0π^0$ at Belle II and an updated measurement of its branching fraction ($\mathcal{B}$). We use a sample of electron-positron collisions collected in 2019 and …

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Improved measurements of branching fractions and CP partial rate asymmetries for B→ωK and B→ωπ

C.-M. Jen, P. Chang, K. Abe, I. Adachi et autres

We report improved measurements of $B$ to pseudoscalar-vector decays containing an $\ensuremath{\omega}$ meson in the final state. Our results are obtained from a data sample that contains $388\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $B\overline{B}$ pairs accumulated at the $\ensuremath{\Upsilon}(4S)$ resonance, with the Belle detector at the KEKB …

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Measurement of the Wrong-Sign Decays D0→K+π−π0 and D0→K+π−π+π− , and Search for CP Violation

X. C. Tian, Y. Ban, K. Abe, H. Aihara et autres

Using $281\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ of data from the Belle experiment recorded at or near the $\ensuremath{\Upsilon}(4S)$ resonance, we have measured the rates of the ``wrong-sign'' decays ${D}^{0}\ensuremath{\rightarrow}{K}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}$ and ${D}^{0}\ensuremath{\rightarrow}{K}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ relative to those of the Cabibbo-favored decays ${D}^{0}\ensuremath{\rightarrow}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{0}$ and ${D}^{0}\ensuremath{\rightarrow}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$. These wrong-sign decays …

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Search for D0−D¯0 mixing using semileptonic decays at Belle

U. Bitenc, K. Abe, K. Abe, I. Adachi et autres

A search for mixing in the neutral $D$ meson system has been performed using semileptonic ${D}^{0}\ensuremath{\rightarrow}{K}^{(*)\ensuremath{-}}{e}^{+}\ensuremath{\nu}$ decays. Neutral $D$ mesons from ${D}^{*+}\ensuremath{\rightarrow}{D}^{0}{\ensuremath{\pi}}^{+}$ decays are used; the flavor at production is tagged by the charge of the slow pion. The measurement is performed …

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Measurement of the branching fractions for B−→D(*)+π−ℓ−ν¯ℓ and B0¯→D(*)0π+ℓ−ν¯ℓ

D. Liventsev, T. Matsumoto, K. Abe, H. Aihara et autres

We report on a measurement of the branching fractions for ${B}^{\ensuremath{-}}\ensuremath{\rightarrow}{D}^{(*)+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\ell}}^{\ensuremath{-}}{\overline{\ensuremath{\nu}}}_{\ensuremath{\ell}}$ and $\overline{{B}^{0}}\ensuremath{\rightarrow}{D}^{(*)0}{\ensuremath{\pi}}^{+}{\ensuremath{\ell}}^{\ensuremath{-}}{\overline{\ensuremath{\nu}}}_{\ensuremath{\ell}}$ with $275\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $B\overline{B}$ events collected at the $\ensuremath{\Upsilon}(4S)$ resonance with the Belle detector at KEKB. Events are tagged by fully reconstructing one of the $B$ mesons in hadronic modes. …

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Studies of CP Violation in B→J/ψK* Decays

R. Itoh, Y. Onuki, K. Abe, I. Adachi et autres

$CP$ violation in $B\ensuremath{\rightarrow}J/\ensuremath{\psi}{K}^{*}$ decays is studied using an angular analysis in a data sample of $253\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ recorded with the Belle detector at the KEKB ${e}^{+}{e}^{\ensuremath{-}}$ collider. The flavor separated measurements of the decay amplitudes indicate no evidence for direct …

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Observation of B+→K1(1270)+γ

Heyoung Yang, M. Nakao, K. Abe, H. Aihara et autres

We report the observation of the radiative decay ${B}^{+}\ensuremath{\rightarrow}{K}_{1}(1270{)}^{+}\ensuremath{\gamma}$ using a data sample of $140\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ taken at the $\ensuremath{\Upsilon}(4S)$ resonance with the Belle detector at the KEKB ${e}^{+}{e}^{\ensuremath{-}}$ collider. We find the branching fraction to be $\mathcal{B}\mathbf{(}{B}^{+}\ensuremath{\rightarrow}{K}_{1}(1270{)}^{+}\ensuremath{\gamma}\mathbf{)}=\mathbf{(}4.3\ifmmode\pm\else\textpm\fi{}0.9(\mathrm{stat}.)\ifmmode\pm\else\textpm\fi{}0.9(\mathrm{syst}.)\mathbf{)}\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5}$ with a significance …

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A measurement of the branching fraction for the inclusive B→Xγ decays with the Belle detector

K. Abe, I. Adachi, Byoung Sup Ahn, H. Aihara et autres

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