K. Hara

activity

20012026

most citedMeasurement of the branching ratio of

B ˉ^{0} \to D^{*+} τ^{-} ν ˉ_{τ}

relative to

B ˉ^{0} \to D^{*+} ℓ^{-} ν ˉ_{ℓ}

decays with a semileptonic tagging method

362 citations · 3.1k across the 73 of their papers we have counts for

collaborators

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74 papers · 1 filter

hep-ex2024

Search for the baryon number and lepton number violating decays $τ^{-} \to Λ π^{-}$ and $τ^{-} \to Λ ˉ π^{-}$ at Belle II

Belle II Collaboration, I. Adachi, L. Aggarwal +371

We present a search for the baryon number $B$ and lepton number $L$ violating decays $τ^{-} \to Λ π^{-}$ and $τ^{-} \to Λ ˉ π^{-}$ produced from the $e^{+} e^{-} \to τ^{+} τ^{-}$ pro…

hep-ex2024★ 8 cited

The Belle II Detector Upgrades Framework Conceptual Design Report

H. Aihara, A. Aloisio, D. P. Auguste +207

We describe the planned near-term and potential longer-term upgrades of the Belle II detector at the SuperKEKB electron-positron collider operating at the KEK laboratory in Tsukuba…

hep-ex2024

Measurement of the energy dependence of the $e^{+} e^{-} \to B B ˉ$ , $B B ˉ^{}$ , and $B^{} B ˉ^{*}$ cross sections at Belle~II

Belle II Collaboration, I. Adachi, L. Aggarwal +466

We report measurements of the $e^{+} e^{-} \to B B ˉ$ , $B B ˉ^{*}$ , and $B^{*} B ˉ^{*}$ cross sections at four energies, 10653, 10701, 10746 and 10805 MeV, using data collected b…

hep-ex2024

Measurement of $C P$ asymmetries in $B^{0} \to K_{S}^{0} K_{S}^{0} K_{S}^{0}$ decays at Belle II

Belle II Collaboration, I. Adachi, L. Aggarwal +450

We report a measurement of decay-time dependent charge-parity ( $C P$ ) asymmetries in $B^{0} \to K_{S}^{0} K_{S}^{0} K_{S}^{0}$ decays. We use $387 \times 1 0^{6} B B ˉ$ pairs collected at…

hep-ex2024★ 4 cited

Silicon Vertex Detector of the Belle II Experiment

S. Mondal, K. Adamczyk, L. Aggarwal +72

The silicon vertex detector (SVD) is installed at the heart of the Belle II experiment, taking data at the high-luminosity $B$ -Factory SuperKEKB since 2019. The detector has shown…

hep-ex2024

A test of lepton flavor universality with a measurement of $R (D^{*})$ using hadronic $B$ tagging at the Belle II experiment

Belle II Collaboration, I. Adachi, K. Adamczyk +434

The ratio of branching fractions $R (D^{*}) = B (B \to D^{*} τ^{-} ν_{τ})$ /$\mathcal{B} (\overline{B} \rightarrow D^{*} \ell^{-} \overlineν_{\ell}…

hep-ex2023

Search for lepton-flavor-violating $τ^{-} \to ℓ^{-} ϕ$ decays in 2019-2021 Belle II data

Belle II Collaboration, F. Abudinén, I. Adachi +575

We report a search for lepton-flavor-violating decays $τ^{-} \to ℓ^{-} ϕ$ ( $ℓ^{-} = e^{-}, μ^{-}$ ) at the Belle II experiment, using a sample of electron-positron data produced at the Su…

hep-ex2023★ 2 cited

Observation of $B \to D^{(*)} K^{-} K_{S}^{0}$ decays using the 2019-2022 Belle II data sample

Belle II Collaboration, F. Abudinén, I. Adachi +575

We present a measurement of the branching fractions of four $B^{0, -} \to D^{(*) +, 0} K^{-} K_{S}^{0}$ decay modes. The measurement is based on data from SuperKEKB electron-positron colli…

hep-ex2023★ 3 cited

Measurement of the $B^{0} \to D^{*-} ℓ^{+} ν_{ℓ}$ branching ratio and $∣ V_{c b} ∣$ with a fully reconstructed accompanying $B$ meson in 2019-2021 Belle II data

F. Abudinén, I. Adachi, K. Adamczyk +581

We present a measurement of the $B^{0} \to D^{*-} ℓ^{+} ν_{ℓ}$ ( $ℓ = e, μ$ ) branching ratio and of the CKM parameter $∣ V_{c b} ∣$ using signal decays accompanied by a f…

hep-ex2022★ 1 cited

Determination of $∣ V_{c b} ∣$ from $B \to D ℓ ν$ decays using 2019-2021 Belle II data

Belle II collaboration, F. Abudinén, I. Adachi +590

We present a determination of the magnitude of the Cabibbo-Kobayashi-Maskawa (CKM) matrix element $V_{c b}$ using $B \to D ℓ ν$ decays. The result is based on $e^{+} e^{-} \to Υ (4 S)$ data…

hep-ex2022

Measurement of the photon-energy spectrum in inclusive $B \to X_{s} γ$ decays identified using hadronic decays of the recoil $B$ meson in 2019-2021 Belle II data

Belle II Collaboration, F. Abudinén, I. Adachi +593

We measure the photon-energy spectrum in radiative bottom-meson ( $B$ ) decays into inclusive final states involving a strange hadron and a photon. We use SuperKEKB electron-positron…

hep-ex2022★ 2 cited

Measurement of Branching Fraction and Longitudinal Polarization in $B^{0} \to ρ^{+} ρ^{-}$ Decays at Belle II

Belle II Collaboration, F. Abudinén, I. Adachi +584

We present a measurement of the branching fraction and longitudinal polarization of $B^{0} \to ρ^{+} ρ^{-}$ decays. SuperKEKB electron-positron collision data corresponding to 189~fb$^{-…

hep-ex2022

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

Belle II Collaboration, F. Abudinén, I. Adachi +591

We report a study of $B \to J / ψ (ℓ^{+} ℓ^{-}) K$ decays, where $ℓ$ represents an electron or a muon, using $e^{+} e^{-}$ collisions at the $Υ (4 S)$ resonance. The data were col…

hep-ex2022★ 19 cited

Search for a dark photon and an invisible dark Higgs boson in $μ^{+} μ^{-}$ and missing energy final states with the Belle II experiment

Belle II Collaboration, F. Abudinén, I. Adachi +357

The dark photon $A^{'}$ and the dark Higgs boson $h^{'}$ are hypothetical particles predicted in many dark sector models. We search for the simultaneous production of $A^\pri…

hep-ex2022★ 1 cited

First decay-time-dependent analysis of $B^{0} \to K_{S}^{0} π^{0}$ at Belle II

Belle II Collaboration, F. Abudinén, I. Adachi +590

We report measurements of the branching fraction ( $B$ ) and direct $C P$ -violating asymmetry ( $A_{C P}$ ) of the charmless decay $B^{0} \to K^{0} π^{0}$ at Belle II. A sample of…

hep-ex2022★ 1 cited

Study of Exclusive $B \to π e^{+} ν_{e}$ Decays with Hadronic Full-event-interpretation Tagging in 189.3 fb $^{- 1}$ of Belle II Data

Belle II Collaboration, F. Abudinén, I. Adachi +590

We present a reconstruction of the semileptonic decays $B^{0} \to π^{-} e^{+} ν_{e}$ and $B^{+} \to π^{0} e^{+} ν_{e}$ in a sample corresponding to 189.3 fb $^{- 1}$ of Belle II data, using events w…

hep-ex2022★ 4 cited

Measurement of the branching fraction for the decay $B \to K^{*} (892) ℓ^{+} ℓ^{-}$ at Belle II

Belle II Collaboration, F. Abudinén, I. Adachi +590

We report a measurement of the branching fraction of $B \to K^{*} (892) ℓ^{+} ℓ^{-}$ decays, where $ℓ^{+} ℓ^{-} = μ^{+} μ^{-}$ or $e^{+} e^{-}$ , using electron-positron collisions recorde…

hep-ex2021

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

Belle II Collaboration, F. Abudinén, I. Adachi +565

We present a reconstruction in early data of the semileptonic decay $B^{+} \to π^{0} ℓ^{+} ν_{ℓ}$ , and first results of a reconstruction of the decays $B^{+} \to ρ^{0} ℓ^{+} ν_{ℓ}$ and…

hep-ex2021★ 1 cited

Study of $χ_{b J} (n P) \to ω Υ (1 S)$ at Belle

Belle Collaboration, A. Abdesselam, I. Adachi +470

We report results from a study of hadronic transitions of the $χ_{b J} (n P)$ states of bottomonium at Belle. The $P$ -wave states are reconstructed in transitions to the $Υ (1 S)$ with…

hep-ex2021★ 11 cited

Precise measurement of the $D^{0}$ and $D^{+}$ lifetimes at Belle II

Belle II collaboration, F. Abudinén, I. Adachi +385

We report a measurement of the $D^{0}$ and $D^{+}$ lifetimes using $D^{0} \to K^{-} π^{+}$ and $D^{+} \to K^{-} π^{+} π^{+}$ decays reconstructed in $e^{+} e^{-} \to c c ˉ$ data recorded by the Belle II exp…

hep-ex2021★ 3 cited

Search for the Decay $B_{s}^{0} \to η^{'} η$

Belle Collaboration, N. K. Nisar, V. Savinov +197

We report the results of the first search for the decay $B_{s}^{0} \to η^{'} η$ using $121.4 fb^{- 1}$ of data collected at the $Υ (5 S)$ resonance with the Belle dete…

hep-ex2021★ 60 cited

Search for $B^{+} \to K^{+} ν ν ˉ$ decays using an inclusive tagging method at Belle II

Belle II Collaboration, F. Abudinén, I. Adachi +377

A search for the flavor-changing neutral-current decay $B^{+} \to K^{+} ν ν ˉ$ is performed at the Belle II experiment at the SuperKEKB asymmetric energy electron-positron collider.…

hep-ex2020

Measurements of branching fractions and CP-violating charge asymmetries in charmless $B$ decays reconstructed in 2019--2020 Belle~II data

Belle II Collaboration, F. Abudinén, I. Adachi +544

We report on first measurements of branching fractions~( $B$ ) and CP-violating charge asymmetries~( $A$ ) in charmless $B$ decays at Belle~II. We use a sample of e…

hep-ex2020

Measurement of Hadronic Mass Moments $⟨ M_{X}^{n} ⟩$ in $B \to X_{c} ℓ ν$ Decays at Belle II

Belle II Collaboration, F. Abudinén, I. Adachi +540

We present measurements of the first six hadronic mass moments in semileptonic $B \to X_{c} ℓ ν$ decays. The hadronic mass moments, together with other observables of incl…

Search for the baryon number and lepton number violating decays τ−→Λπ− and τ−→Λˉπ− at Belle II

The Belle II Detector Upgrades Framework Conceptual Design Report

Measurement of the energy dependence of the e+e−→BBˉ, BBˉ∗, and B∗Bˉ∗ cross sections at Belle~II

Measurement of CP asymmetries in B0→KS0​KS0​KS0​ decays at Belle II

Silicon Vertex Detector of the Belle II Experiment

A test of lepton flavor universality with a measurement of R(D∗) using hadronic B tagging at the Belle II experiment

Search for lepton-flavor-violating τ−→ℓ−ϕ decays in 2019-2021 Belle II data

Observation of B→D(∗)K−KS0​ decays using the 2019-2022 Belle II data sample

Measurement of the B0→D∗−ℓ+νℓ​ branching ratio and ∣Vcb​∣ with a fully reconstructed accompanying B meson in 2019-2021 Belle II data

Determination of ∣Vcb​∣ from B→Dℓν decays using 2019-2021 Belle II data

Measurement of the photon-energy spectrum in inclusive B→Xs​γ decays identified using hadronic decays of the recoil B meson in 2019-2021 Belle II data

Measurement of Branching Fraction and Longitudinal Polarization in B0→ρ+ρ− Decays at Belle II

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

Search for a dark photon and an invisible dark Higgs boson in μ+μ− and missing energy final states with the Belle II experiment

First decay-time-dependent analysis of B0→KS0​π0 at Belle II

Study of Exclusive B→πe+νe​ Decays with Hadronic Full-event-interpretation Tagging in 189.3 fb−1 of Belle II Data

Measurement of the branching fraction for the decay B→K∗(892)ℓ+ℓ− at Belle II

Exclusive B→Xu​ℓνℓ​ Decays with Hadronic Full-event-interpretation Tagging in 62.8 fb−1 of Belle II Data

Study of χbJ​(nP)→ωΥ(1S) at Belle

Precise measurement of the D0 and D+ lifetimes at Belle II

Search for the Decay Bs0​→η′η

Search for B+→K+ννˉ decays using an inclusive tagging method at Belle II

Measurements of branching fractions and CP-violating charge asymmetries in charmless B decays reconstructed in 2019--2020 Belle~II data

Measurement of Hadronic Mass Moments ⟨MXn​⟩ in B→Xc​ℓν Decays at Belle II

Search for the baryon number and lepton number violating decays $τ^{-} \to Λ π^{-}$ and $τ^{-} \to Λ ˉ π^{-}$ at Belle II

Measurement of the energy dependence of the $e^{+} e^{-} \to B B ˉ$ , $B B ˉ^{}$ , and $B^{} B ˉ^{*}$ cross sections at Belle~II

Measurement of $C P$ asymmetries in $B^{0} \to K_{S}^{0} K_{S}^{0} K_{S}^{0}$ decays at Belle II

A test of lepton flavor universality with a measurement of $R (D^{*})$ using hadronic $B$ tagging at the Belle II experiment

Search for lepton-flavor-violating $τ^{-} \to ℓ^{-} ϕ$ decays in 2019-2021 Belle II data

Observation of $B \to D^{(*)} K^{-} K_{S}^{0}$ decays using the 2019-2022 Belle II data sample

Measurement of the $B^{0} \to D^{*-} ℓ^{+} ν_{ℓ}$ branching ratio and $∣ V_{c b} ∣$ with a fully reconstructed accompanying $B$ meson in 2019-2021 Belle II data

Determination of $∣ V_{c b} ∣$ from $B \to D ℓ ν$ decays using 2019-2021 Belle II data

Measurement of the photon-energy spectrum in inclusive $B \to X_{s} γ$ decays identified using hadronic decays of the recoil $B$ meson in 2019-2021 Belle II data

Measurement of Branching Fraction and Longitudinal Polarization in $B^{0} \to ρ^{+} ρ^{-}$ Decays at Belle II

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

Search for a dark photon and an invisible dark Higgs boson in $μ^{+} μ^{-}$ and missing energy final states with the Belle II experiment

First decay-time-dependent analysis of $B^{0} \to K_{S}^{0} π^{0}$ at Belle II

Study of Exclusive $B \to π e^{+} ν_{e}$ Decays with Hadronic Full-event-interpretation Tagging in 189.3 fb $^{- 1}$ of Belle II Data

Measurement of the branching fraction for the decay $B \to K^{*} (892) ℓ^{+} ℓ^{-}$ at Belle II

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

Study of $χ_{b J} (n P) \to ω Υ (1 S)$ at Belle

Precise measurement of the $D^{0}$ and $D^{+}$ lifetimes at Belle II

Search for the Decay $B_{s}^{0} \to η^{'} η$

Search for $B^{+} \to K^{+} ν ν ˉ$ decays using an inclusive tagging method at Belle II

Measurements of branching fractions and CP-violating charge asymmetries in charmless $B$ decays reconstructed in 2019--2020 Belle~II data

Measurement of Hadronic Mass Moments $⟨ M_{X}^{n} ⟩$ in $B \to X_{c} ℓ ν$ Decays at Belle II