K. Hara

activity

20012026

most citedMeasurement of the branching ratio of

B ˉ \to D^{(*)} τ^{-} ν ˉ_{τ}

relative to

B ˉ \to D^{(*)} ℓ^{-} ν ˉ_{ℓ}

decays with hadronic tagging at Belle

676 citations · 1.9k across the 16 of their papers we have counts for

collaborators

16 papers

physics.ins-det2026

Upgrade of the Belle II Vertex Detector with Depleted Monolithic CMOS Active Pixel Sensors

Belle II VTX Collaboration

The Belle II experiment, operating at the asymmetric SuperKEKB $e^{+} e^{-}$ collider, is preparing an upgrade of its vertex detector to cope with an increased luminosity of $6 \times 1…

hep-ex2023★ 10 cited

Measurement of the $B^{0}$ lifetime and flavor-oscillation frequency using hadronic decays reconstructed in 2019-2021 Belle II data

Belle II Collaboration, F. Abudinén, I. Adachi +393

We measure the $B^{0}$ lifetime and flavor-oscillation frequency using $B^{0} \to D^{(*) -} π^{+}$ decays collected by the Belle II experiment in asymmetric-energy $e^{+} e^{-}$ collisions produ…

hep-ex2023★ 10 cited

Measurement of decay-time-dependent $CP$ violation in $B^{0} \to J / ψ K_{S}^{0}$ decays using 2019-2021 Belle II data

Belle II Collaboration, I. Adachi, L. Aggarwal +392

We report a measurement of the mixing-induced and direct $CP$ violation parameters $S_{CP}$ and $A_{CP}$ from $B^{0} \to J / ψ K_{S}^{0}$ decays reconstructed by the…

physics.ins-det2022★ 6 cited

The Silicon Vertex Detector of the Belle II Experiment

Laura Zani

Since the start of data taking in spring 2019 at the SuperKEKB collider (KEK, Japan) the Belle II Silicon Vertex Detector (SVD) has been operating reliably and with high efficiency…

physics.ins-det2021★ 1 cited

The Silicon Vertex Detector of the Belle II Experiment

G. Dujany, K. Adamczyk, L. Aggarwal +78

In 2019 the Belle II experiment started data taking at the asymmetric SuperKEKB collider (KEK, Japan) operating at the Y(4S) resonance. Belle II will search for new physics beyond…

hep-ex2019★ 236 cited

Measurement of $R (D)$ and $R (D^{*})$ with a semileptonic tagging method

The Belle Collaboration, G. Caria, P. Urquijo +188

The experimental results on the ratios of branching fractions $R (D) = B (B ˉ \to D τ^{-} ν ˉ_{τ}) / B (B ˉ \to D ℓ^{-} ν ˉ_{ℓ})$ and $\mathcal{R}(D^…

hep-ex2017★ 232 cited

Measurement of the $τ$ lepton polarization and $R (D^{})$ in the decay $B ˉ \to D^{} τ^{-} ν ˉ_{τ}$ with one-prong hadronic $τ$ decays at Belle

S. Hirose, T. Iijima, I. Adachi +181

With the full data sample of $772 \times 1 0^{6}$ $B B ˉ$ pairs recorded by the Belle detector at the KEKB electron-positron collider, the decay $\bar{B} \rightarrow D^* τ^- \barν…

hep-ex2016★ 471 cited

Measurement of the $τ$ lepton polarization and $R (D^{})$ in the decay $B ˉ \to D^{} τ^{-} ν ˉ_{τ}$

S. Hirose, T. Iijima, I. Adachi +191

We report the first measurement of the $τ$ lepton polarization $P_{τ} (D^{*})$ in the decay $B ˉ \to D^{*} τ^{-} ν ˉ_{τ}$ as well as a new measurement of the ratio of the branch…

physics.ins-det2015

Belle II Silicon Vertex Detector

Gagan B. Mohanty

The Belle II experiment at the SuperKEKB collider in Japan is designed to indirectly probe new physics using approximately 50 times the data recorded by its predecessor. An accurat…

hep-ex2015★ 676 cited

Measurement of the branching ratio of $B ˉ \to D^{()} τ^{-} ν ˉ_{τ}$ relative to $B ˉ \to D^{()} ℓ^{-} ν ˉ_{ℓ}$ decays with hadronic tagging at Belle

Belle Collaboration, M. Huschle, T. Kuhr +201

We report a measurement of the branching fraction ratios R(D(*)) of Bbar -> D(*) tau- nubar_tau relative to Bbar -> D()* l- nubar_l (where l = e or mu) using the full Belle data sa…

physics.ins-det2014★ 14 cited

Silica aerogel radiator for use in the A-RICH system utilized in the Belle II experiment

Makoto Tabata, Ichiro Adachi, Nao Hamada +17

This paper presents recent progress in the development and mass production of large-area hydrophobic silica aerogels for use as radiators in the aerogel-based ring-imaging Cherenko…

hep-ex2008★ 2 cited

Rare B decays with leptons at Belle

K. Hara

We present a new measurement of the purely leptonic decay B- -> tau- nu_tau-bar with a semileptonic B tagging method, using a data sample containing 657*10^6 BB-bar pairs collected…

hep-ex2004★ 110 cited

Neutral B Flavor Tagging for the Measurement of Mixing-induced CP Violation at Belle

H. Kakuno, K. Hara, B. C. K. Casey +13

We describe a flavor tagging algorithm used in measurements of the CP violation parameter sin2phi_1 at the Belle experiment. Efficiencies and wrong tag fractions are evaluated usin…

hep-ex2002★ 15 cited

Measurement of CP-Violating Parameters in $B \to η^{'} K$ Decays

K. F. Chen, K. Hara

We present measurements of CP-violating parameters in $B^{0} (B ˉ^{0}) \to η^{'} K_{S}^{0}$ and $B^{\pm} \to η^{'} K^{\pm}$ decays based on a 41.8 fb $^{- 1}$ data sample collected at t…

hep-ex2002★ 12 cited

Mesurement of the B0 - anti-B0 Mixing Parameter Delta m_d using Semileptonic B0 Decays

Belle Collaboration, K. Hara, M. Hazumi

We present a measurement of the B^0-B^0bar mixing parameter Delta m_d using neutral B meson pairs in a 29.1 fb^{-1} data sample collected at the Upsilon(4S) resonance with the Bell…

hep-ex2001★ 81 cited

Measurement of Branching Fractions for B->ππ, Kπand KK Decays

K. Abe

We report measurements of the branching fractions for $B^{0} \to π^{+} π^{-}$ , $K^{+} π^{-}$ , $K^{+} K^{-}$ and $K^{0} π^{0}$ , and $B^{+} \to π^{+} π^{0}$ , $K^{+} π^{0}$ , $K^{0} π^{+}$ and $K^{+} K ˉ^{0}$ . The results are…

Upgrade of the Belle II Vertex Detector with Depleted Monolithic CMOS Active Pixel Sensors

Measurement of the B0 lifetime and flavor-oscillation frequency using hadronic decays reconstructed in 2019-2021 Belle II data

Measurement of decay-time-dependent CP violation in B0→J/ψKS0​ decays using 2019-2021 Belle II data

The Silicon Vertex Detector of the Belle II Experiment

The Silicon Vertex Detector of the Belle II Experiment

Measurement of R(D) and R(D∗) with a semileptonic tagging method

Measurement of the τ lepton polarization and R(D∗) in the decay Bˉ→D∗τ−νˉτ​ with one-prong hadronic τ decays at Belle

Measurement of the τ lepton polarization and R(D∗) in the decay Bˉ→D∗τ−νˉτ​

Belle II Silicon Vertex Detector

Measurement of the branching ratio of Bˉ→D(∗)τ−νˉτ​ relative to Bˉ→D(∗)ℓ−νˉℓ​ decays with hadronic tagging at Belle

Silica aerogel radiator for use in the A-RICH system utilized in the Belle II experiment

Rare B decays with leptons at Belle

Neutral B Flavor Tagging for the Measurement of Mixing-induced CP Violation at Belle

Measurement of CP-Violating Parameters in B→η′K Decays

Mesurement of the B0 - anti-B0 Mixing Parameter Delta m_d using Semileptonic B0 Decays

Measurement of Branching Fractions for B->ππ, Kπand KK Decays

Measurement of the $B^{0}$ lifetime and flavor-oscillation frequency using hadronic decays reconstructed in 2019-2021 Belle II data

Measurement of decay-time-dependent $CP$ violation in $B^{0} \to J / ψ K_{S}^{0}$ decays using 2019-2021 Belle II data

Measurement of $R (D)$ and $R (D^{*})$ with a semileptonic tagging method

Measurement of the $τ$ lepton polarization and $R (D^{})$ in the decay $B ˉ \to D^{} τ^{-} ν ˉ_{τ}$ with one-prong hadronic $τ$ decays at Belle

Measurement of the $τ$ lepton polarization and $R (D^{})$ in the decay $B ˉ \to D^{} τ^{-} ν ˉ_{τ}$

Measurement of the branching ratio of $B ˉ \to D^{()} τ^{-} ν ˉ_{τ}$ relative to $B ˉ \to D^{()} ℓ^{-} ν ˉ_{ℓ}$ decays with hadronic tagging at Belle

Measurement of CP-Violating Parameters in $B \to η^{'} K$ Decays