K. Hara

activity

20102026

most citedThe Belle II Physics Book

570 citations · 581 across the 12 of their papers we have counts for

collaborators

Showing hep-exShow all

14 papers · 1 filter

hep-ex2026

Test of lepton flavor universality with $B ˉ \to D^{()} τ^{-} ν ˉ_{τ}$ and $B ˉ \to D^{()} ℓ^{-} ν ˉ_{ℓ}$ decays at Belle II

Belle II Collaboration, M. Abumusabh, I. Adachi +494

We test lepton flavor universality with a measurement of the branching-fraction ratios $R(D^{(*)}) \equiv \mathcal{B}(\bar{B} \rightarrow D^{(*)} τ^{-} \barν_τ)/\mathcal{B}(\bar{B}…

hep-ex2021

$B$ -flavor tagging at Belle II

F. Abudinén, N. Akopov, A. Aloisio +118

We report on new flavor tagging algorithms developed to determine the quark-flavor content of bottom ( $B$ ) mesons at Belle II. The algorithms provide essential inputs for measureme…

hep-ex2021

Rediscovery of $B^{0} \to J / ψ K_{L}^{0}$ at Belle II

Belle II Collaboration, F. Abudinén, I. Adachi +545

We present preliminary results on the reconstruction of the $B^{0} \to J / ψ K_{L}^{0}$ decay, where $J / ψ \to μ^{+} μ^{-}$ or $e^+e…

hep-ex2021

Measurement of the time-integrated mixing probability $χ_{d}$ with a semileptonic double-tagging strategy and $34.6 fb^{- 1}$ of Belle II collision data

Belle II Collaboration, F. Abudinén, I. Adachi +550

We present the first measurement of the time-integrated mixing probability $χ_{d}$ using Belle II data collected at a center-of-mass (CM) energy of 10.58 GeV, corresponding to the ma…

hep-ex2021★ 3 cited

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

Belle II Collaboration, F. Abudinén, I. Adachi +551

We report on the first measurement of the direct $C P$ -violating asymmetry ( $A$ ) in the charmless decay $B^{0} \to K^{0} π^{0}$ at Belle II and an updated measurement of its bran…

hep-ex2021★ 3 cited

Study of $B \to D^{(*)} h$ decays using $62.8 fb^{- 1}$ of Belle II data

Belle II Collaboration, F. Abudinen, I. Adachi +549

We report measurements related to hadronic $B$ decays to final states that contain charm mesons. The analyses are performed on a $62.8 fb^{- 1}$ data set collected by the B…

hep-ex2020

Measurement of the semileptonic $B ˉ^{0} \to D^{*+} ℓ^{-} ν_{ℓ}$ branching fraction with fully reconstructed $B$ meson decays and 34.6 fb $^{- 1}$ of Belle II data

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

We present a first measurement of the $B^{0} ˉ \to D^{*+} ℓ^{-} ν_{ℓ}$ branching fraction using fully reconstructed $B$ meson decays employing the Full Event Inte…

hep-ex2020

Exclusive $B^{0} \to π^{-} ℓ^{+} ν_{ℓ}$ Decays with Hadronic Full Event Interpretation Tagging in 34.6 fb $^{- 1}$ of Belle II Data

Belle II Collaboration, F. Abudinén, I. Adachi +541

We present the results of the re-discovery of the decay $B^{0} \to π^{-} ℓ^{+} ν_{ℓ}$ in 34.6 fb $^{- 1}$ of Belle II data using hadronic $B$ -tagging via the Full Event Interpretation…

hep-ex2020★ 2 cited

A calibration of the Belle II hadronic tag-side reconstruction algorithm with $B \to X ℓ ν$ decays

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

Tag-side reconstruction is an important method for reconstructing $B$ meson decays with missing energy. The Belle II tag-side reconstruction algorithm, Full Event Interpretation, r…

hep-ex2020★ 2 cited

Rediscovery of $B \to ϕ K^{()}$ decays and measurement of the longitudinal polarization fraction $f_{L}$ in $B \to ϕ K^{}$ decays using the Summer 2020 Belle II dataset

F. Abudinén, I. Adachi, R. Adak +538

We utilize a sample of 34.6 fb $^{- 1}$ , collected by the Belle II experiment at the SuperKEKB asymmetric energy $e^{+} e^{-}$ collider, to search for the $B^{+} \to ϕ K^{+}$ , $B^+ \to ϕK^{*+}…

hep-ex2020★ 1 cited

First flavor tagging calibration using 2019 Belle II data

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

We report on the first calibration of the standard Belle II $B$ -flavor tagger using the full data set collected at the $Υ (4 S)$ resonance in 2019 with the Belle II detector at…

hep-ex2020

Charmless $B$ decay reconstruction in 2019 Belle II data

Belle II Collaboration, F. Abudinén, I. Adachi +533

We report on the reconstruction of various charmless $B$ decays from electron-positron collisions at the energy corresponding to the $Υ (4 S)$ resonance collected with the Belle II d…

hep-ex2020

Measurement of the branching fraction $B (B ˉ^{0} \to D^{*+} ℓ^{-} ν ˉ_{ℓ})$ with early Belle II data

Belle II Collaboration, F. Abudinén, I. Adachi +533

We measure the branching fractions for the decays $B ˉ^{0} \to D^{*+} e^{-} ν ˉ_{e}$ and $B ˉ^{0} \to D^{*+} μ^{-} ν ˉ_{μ}$ using $8.70 \pm 0.09 fb^{- 1}$ of data collecte…

hep-ex2018★ 570 cited

The Belle II Physics Book

E. Kou, P. Urquijo, W. Altmannshofer +524

We present the physics program of the Belle II experiment, located on the intensity frontier SuperKEKB $e^{+} e^{-}$ collider. Belle II collected its first collisions in 2018, and is ex…

Test of lepton flavor universality with Bˉ→D(∗)τ−νˉτ​ and Bˉ→D(∗)ℓ−νˉℓ​ decays at Belle II

B-flavor tagging at Belle II

Rediscovery of B0→J/ψKL0​ at Belle II

Measurement of the time-integrated mixing probability χd​ with a semileptonic double-tagging strategy and 34.6fb−1 of Belle II collision data

First search for direct CP-violating asymmetry in B0→K0π0 decays at Belle II

Study of B→D(∗)h decays using 62.8 fb−1 of Belle II data

Measurement of the semileptonic Bˉ0→D∗+ℓ−νℓ​ branching fraction with fully reconstructed B meson decays and 34.6 fb−1of Belle II data

Exclusive B0→π−ℓ+νℓ​ Decays with Hadronic Full Event Interpretation Tagging in 34.6 fb−1 of Belle II Data

A calibration of the Belle II hadronic tag-side reconstruction algorithm with B→Xℓν decays

Rediscovery of B→ϕK(∗) decays and measurement of the longitudinal polarization fraction fL​ in B→ϕK∗ decays using the Summer 2020 Belle II dataset

First flavor tagging calibration using 2019 Belle II data

Charmless B decay reconstruction in 2019 Belle II data

Measurement of the branching fraction B(Bˉ0→D∗+ℓ−νˉℓ​) with early Belle II data

The Belle II Physics Book

Test of lepton flavor universality with $B ˉ \to D^{()} τ^{-} ν ˉ_{τ}$ and $B ˉ \to D^{()} ℓ^{-} ν ˉ_{ℓ}$ decays at Belle II

$B$ -flavor tagging at Belle II

Rediscovery of $B^{0} \to J / ψ K_{L}^{0}$ at Belle II

Measurement of the time-integrated mixing probability $χ_{d}$ with a semileptonic double-tagging strategy and $34.6 fb^{- 1}$ of Belle II collision data

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

Study of $B \to D^{(*)} h$ decays using $62.8 fb^{- 1}$ of Belle II data

Measurement of the semileptonic $B ˉ^{0} \to D^{*+} ℓ^{-} ν_{ℓ}$ branching fraction with fully reconstructed $B$ meson decays and 34.6 fb $^{- 1}$ of Belle II data

Exclusive $B^{0} \to π^{-} ℓ^{+} ν_{ℓ}$ Decays with Hadronic Full Event Interpretation Tagging in 34.6 fb $^{- 1}$ of Belle II Data

A calibration of the Belle II hadronic tag-side reconstruction algorithm with $B \to X ℓ ν$ decays

Rediscovery of $B \to ϕ K^{()}$ decays and measurement of the longitudinal polarization fraction $f_{L}$ in $B \to ϕ K^{}$ decays using the Summer 2020 Belle II dataset

Charmless $B$ decay reconstruction in 2019 Belle II data

Measurement of the branching fraction $B (B ˉ^{0} \to D^{*+} ℓ^{-} ν ˉ_{ℓ})$ with early Belle II data