R. Karl

activity

20202023

B^{+} \to K^{+} ν ν ˉ

decays using an inclusive tagging method at Belle II

60 citations · 200 across the 38 of their papers we have counts for

collaborators

43 papers

hep-ex2023★ 10 cited

Search for a $τ^{+} τ^{-}$ resonance in $e^{+} e^{-} \to μ^{+} μ^{-} τ^{+} τ^{-}$ events with the Belle II experiment

Belle II Collaboration, I. Adachi, K. Adamczyk +464

We report the first search for a non-standard-model resonance decaying into $τ$ pairs in $e^{+} e^{-} \to μ^{+} μ^{-} τ^{+} τ^{-}$ events in the 3.6-10 GeV/ $c^{2}$ mass range. We u…

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★ 21 cited

Search for an invisible $Z^{'}$ in a final state with two muons and missing energy at Belle II

Belle II Collaboration, I. Adachi, K. Adamczyk +385

The $L_{μ} - L_{τ}$ extension of the standard model predicts the existence of a lepton-flavor-universality-violating $Z^{'}$ boson that couples only to the heavier lepton families.…

hep-ex2022★ 3 cited

Determination of $∣ V_{u b} ∣$ from untagged $B^{0} \to π^{-} ℓ^{+} ν_{ℓ}$ decays using 2019-2021 Belle II data

Belle II Collaboration, K. Adamczyk, L. Aggarwal +588

We present an analysis of the charmless semileptonic decay $B^{0} \to π^{-} ℓ^{+} ν_{ℓ}$ , where $ℓ = e, μ$ , from 198.0 million pairs of $B B ˉ$ mesons recorded by the Belle II…

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★ 24 cited

Observation of $e^{+} e^{-} \to ω χ_{b J} (1 P)$ and search for $X_{b} \to ω Υ (1 S)$ at $s$ near 10.75 GeV

Belle II collaboration, I. Adachi, L. Aggarwal +348

We study the processes $e^{+} e^{-} \to ω χ_{b J} (1 P)$ ( $J$ = 0, 1, or 2) using samples at center-of-mass energies $s$ = 10.701, 10.745, and 10.805 GeV, corresponding to 1.6, 9.8, an…

hep-ex2022★ 12 cited

Measurement of the $Ω_{c}^{0}$ lifetime at Belle II

Belle II Collaboration, F. Abudinén, I. Adachi +353

We report on a measurement of the $Ω_{c}^{0}$ lifetime using $Ω_{c}^{0} \to Ω^{-} π^{+}$ decays reconstructed in $e^{+} e^{-} \to c c ˉ$ data collected by the Belle II experiment and corresponding…

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★ 2 cited

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 +590

We report on a Belle II measurement of the branching fraction ( $B$ ), longitudinal polarization fraction ( $f_{L}$ ), and CP asymmetry ( $A_{C P}$ ) of $B^{+} \to ρ^{+} ρ^{0}$ …

hep-ex2022

Measurement of the branching fraction of the $B^{0} \to K_{S}^{0} π^{0} γ$ decay using 190 fb $^{- 1}$ of Belle II data

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

We report the measurement of the branching fraction of the $B^{0} \to K_{S}^{0} π^{0} γ$ decay in $e^{+} e^{-} \to Υ (4 S) \to B B$ data recorded by the Belle II experiment at the Sup…

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★ 9 cited

Measurement of the $Λ_{c}^{+}$ lifetime

Belle II Collaboration, F. Abudinén, L. Aggarwal +360

An absolute measurement of the $Λ_{c}^{+}$ lifetime is reported using $Λ_{c}^{+} \to p K^{-} π^{+}$ decays in events reconstructed from data collected by the Belle II experiment at the…

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

Measurements of the branching fractions for $B \to K^{*} γ$ decays at Belle II

F. Abudinén, I. Adachi, R. Adak +565

This paper reports a study of $B \to K^{*} γ$ decays using $62.8 \pm 0.6$ fb $^{- 1}$ of data collected during 2019--2020 by the Belle II experiment at the SuperKEKB $e^{+} e^{-}$ asymm…

hep-ex2021

Combined analysis of Belle and Belle II data to determine the CKM angle $ϕ_{3}$ using $B^{+} \to D (K_{S}^{0} h^{-} h^{+}) h^{+}$ decays

Belle, Belle II Collaborations, : +319

We present a measurement of the Cabibbo-Kobayashi-Maskawa unitarity triangle angle $ϕ_{3}$ (also known as~ $γ$ ) using a model-independent Dalitz plot analysis of \linebreak $B^+\t…

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

Angular analysis of $B^{+} \to ρ^{+} ρ^{0}$ decays reconstructed in 2019-2020 Belle II data

Belle II collaboration, F. Abudinén, I. Adachi +549

We report on the first Belle II measurement of the branching fraction ( $B$ ) and longitudinal polarization fraction ( $f_{L}$ ) of $B^{+} \to ρ^{+} ρ^{0}$ decays. We reconstruct $B^+\…

Search for a τ+τ− resonance in e+e−→μ+μ−τ+τ− events with 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

Search for an invisible Z′ in a final state with two muons and missing energy at Belle II

Determination of ∣Vub​∣ from untagged B0→π−ℓ+νℓ​ decays using 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

Observation of e+e−→ωχbJ​(1P) and search for Xb​→ωΥ(1S) at s​ near 10.75 GeV

Measurement of the Ωc0​ lifetime 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

Angular analysis of B+→ρ+ρ0 decays reconstructed in 2019, 2020, and 2021 Belle II data

Measurement of the branching fraction of the B0→KS0​π0γ decay using 190 fb−1 of Belle II data

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

Measurement of the Λc+​ lifetime

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

Measurements of the branching fractions for B→K∗γ decays at Belle II

Combined analysis of Belle and Belle II data to determine the CKM angle ϕ3​ using B+→D(KS0​h−h+)h+ decays

B-flavor tagging at Belle II

Angular analysis of B+→ρ+ρ0 decays reconstructed in 2019-2020 Belle II data

Search for a $τ^{+} τ^{-}$ resonance in $e^{+} e^{-} \to μ^{+} μ^{-} τ^{+} τ^{-}$ events with 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

Search for an invisible $Z^{'}$ in a final state with two muons and missing energy at Belle II

Determination of $∣ V_{u b} ∣$ from untagged $B^{0} \to π^{-} ℓ^{+} ν_{ℓ}$ decays using 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

Observation of $e^{+} e^{-} \to ω χ_{b J} (1 P)$ and search for $X_{b} \to ω Υ (1 S)$ at $s$ near 10.75 GeV

Measurement of the $Ω_{c}^{0}$ lifetime 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

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

Measurement of the branching fraction of the $B^{0} \to K_{S}^{0} π^{0} γ$ decay using 190 fb $^{- 1}$ of Belle II data

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

Measurement of the $Λ_{c}^{+}$ lifetime

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

Measurements of the branching fractions for $B \to K^{*} γ$ decays at Belle II

Combined analysis of Belle and Belle II data to determine the CKM angle $ϕ_{3}$ using $B^{+} \to D (K_{S}^{0} h^{-} h^{+}) h^{+}$ decays

$B$ -flavor tagging at Belle II

Angular analysis of $B^{+} \to ρ^{+} ρ^{0}$ decays reconstructed in 2019-2020 Belle II data