J. Ahn

activity

20072025

most citedTime and Amplitude of Afterpulse Measured with a Large Size Photomultiplier Tube

48 citations · 468 across the 51 of their papers we have counts for

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51 papers · 1 filter

hep-ex2025

Measurement of the Branching Fraction of $Λ_{c}^{+} \to p K_{S}^{0} π^{0}$ at Belle

The Belle, Belle II Collaborations, : +426

We report a precise measurement of the ratio of branching fractions $B (Λ_{c}^{+} \to p K_{S}^{0} π^{0}) / B (Λ_{c}^{+} \to p K^{-} π^{+})$ using 980 fb $^{- 1}$ of $e^{+} e^{-}$ data from th…

hep-ex2025

Search for Pcs(4459) and Pcs(4338) in Upsilon(1S,2S) inclusive decays at Belle

I. Adachi, L. Aggarwal, H. Ahmed +402

Using data samples of 102 million Upsilon(1S) events and 158 million Upsilon(2S) events collected by the Belle detector at the KEKB asymmetric-energy $e^{+} e^{-}$ collider, we search f…

hep-ex2024★ 2 cited

Search for charmed baryons in the $Λ_{c}^{+} η$ system and measurement of the branching fractions of $Λ_{c} (2880)^{+}$ and $Λ_{c} (2940)^{+}$ decaying to $Λ_{c}^{+} η$ and $p D^{0}$ relative to $Σ_{c} (2455) π$

Belle Collaboration, S. X. Li, C. P. Shen +125

We search for excited charmed baryons in the $Λ_{c}^{+} η$ system using a data sample corresponding to an integrated luminosity of 980 $f b^{- 1}$ . The data were collected by the Bell…

hep-ex2024

Search for Two-Body $B$ Meson Decays to $Λ^{0}$ and $Ω_{c}^{(*) 0}$

Belle Collaboration, V. Savinov, I. Adachi +146

We report the results of the first search for Standard Model and baryon-number-violating two-body decays of the neutral $B$ mesons to $Λ^{0}$ and $Ω_{c}^{(*) 0}$ using 711~${\rm fb^{-…

hep-ex2024

Search for a pentaquark state decaying into $p J / ψ$ in $Υ (1, 2 S)$ inclusive decays at Belle

Belle Collaboration, X. Dong, S. M. Zou +162

Using the data samples of 102 million $Υ (1 S)$ and 158 million $Υ (2 S)$ events collected by the Belle detector, we search for a pentaquark state in the $p J / ψ$ final state from $Υ(1,2…

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★ 17 cited

Study of the lineshape of $X (3872)$ using $B$ decays to $D^{0} D^{* 0} K$

Belle Collaboration, H. Hirata, T. Iijima +210

We present a study of the $X (3872)$ lineshape in the decay $B \to X (3872) K \to D^{0} D^{* 0} K$ using a data sample of $772 \times 1 0^{6}$ $B B$ pairs collected at th…

hep-ex2023★ 6 cited

Measurement of the mass and width of the $Λ_{c} (2625)^{+}$ and the branching ratios of $Λ_{c} (2625)^{+} \to Σ_{c}^{0} π^{+}$ and $Λ_{c} (2625)^{+} \to Σ_{c}^{++} π^{-}$

Belle Collaboration, D. Wang, J. Yelton +181

Using the entire data sample of $980 fb^{- 1}$ collected with the Belle detector operating at the KEKB asymmetric-energy collider, we report the measurement of the mass, w…

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

Reconstruction of $B \to ρ ℓ ν_{ℓ}$ decays identified using hadronic decays of the recoil $B$ meson in 2019 -- 2021 Belle II data

Belle II Collaboration, F. Abudinén, I. Adachi +580

We present results on the semileptonic decays $B^{0} \to ρ^{-} ℓ^{+} ν_{ℓ}$ and $B^{+} \to ρ^{0} ℓ^{+} ν_{ℓ}$ in a sample corresponding to 189.9/fb of Belle II data at the SuperKEKB $e…

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★ 18 cited

First Observation of $Λ π^{+}$ and $Λ π^{-}$ Signals near the $K ˉ N (I = 1)$ Mass Threshold in $Λ_{c}^{+} \to Λ π^{+} π^{+} π^{-}$ Decay

Belle Collaboration, Y. Ma, J. Yelton +195

Using the data sample of 980 fb $^{- 1}$ collected with the Belle detector operating at the KEKB asymmetric-energy $e^{+} e^{-}$ collider, we present the results of an investigation of th…

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

Measurement of branching fractions of $Λ_{c}^{+} \to p K_{S}^{0} K_{S}^{0}$ and $Λ_{c}^{+} \to p K_{S}^{0} η$ at Belle

Belle Collaboration, L. K. Li, K. Kinoshita +204

We present a study of a singly Cabibbo-suppressed decay $Λ_{c}^{+} \to p K_{S}^{0} K_{S}^{0}$ and a Cabibbo-favored decay $Λ_{c}^{+} \to p K_{S}^{0} η$ based on 980 $f b^{- 1}$ of data collected by the…

hep-ex2022★ 9 cited

Evidence for the singly Cabibbo-suppressed decay $Ω_{c}^{0} \to Ξ^{-} π^{+}$ and search for $Ω_{c}^{0} \to Ξ^{-} K^{+}$ and $Ω^{-} K^{+}$ decays at Belle

Belle Collaboration, X. Han, S. Jia +170

Using a data sample of 980 fb $^{- 1}$ collected with the Belle detector at the KEKB asymmetric-energy $e^{+} e^{-}$ collider, we study for the first time the singly Cabibbo-suppressed de…

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★ 8 cited

Measurements of branching fractions of $Λ_{c}^{+} \to Σ^{+} η$ and $Λ_{c}^{+} \to Σ^{+} η^{'}$ and asymmetry parameters of $Λ_{c}^{+} \to Σ^{+} π^{0}$ , $Λ_{c}^{+} \to Σ^{+} η$ , and $Λ_{c}^{+} \to Σ^{+} η^{'}$

Belle Collaboration, S. X. Li, C. P. Shen +168

We report a study of $Λ_{c}^{+} \to Σ^{+} π^{0}$ , $Λ_{c}^{+} \to Σ^{+} η$ , and $Λ_{c}^{+} \to Σ^{+} η^{'}$ using the data sample corresponding to an integrated luminosity of 980 $f b^{- 1}$ collected w…

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★ 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…

Measurement of the Branching Fraction of Λc+​→pKS0​π0 at Belle

Search for Pcs(4459) and Pcs(4338) in Upsilon(1S,2S) inclusive decays at Belle

Search for charmed baryons in the Λc+​η system and measurement of the branching fractions of Λc​(2880)+ and Λc​(2940)+ decaying to Λc+​η and pD0 relative to Σc​(2455)π

Search for Two-Body B Meson Decays to Λ0 and Ωc(∗)0​

Search for a pentaquark state decaying into pJ/ψ in Υ(1,2S) inclusive decays at Belle

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

Study of the lineshape of X(3872) using B decays to D0D∗0K

Measurement of the mass and width of the Λc​(2625)+ and the branching ratios of Λc​(2625)+→Σc0​π+ and Λc​(2625)+→Σc++​π−

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

Reconstruction of B→ρℓνℓ​ decays identified using hadronic decays of the recoil B meson in 2019 -- 2021 Belle II data

Determination of ∣Vub​∣ from untagged B0→π−ℓ+νℓ​ decays using 2019-2021 Belle II data

First Observation of Λπ+ and Λπ− Signals near the KˉN(I=1) Mass Threshold in Λc+​→Λπ+π+π− Decay

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 fractions of Λc+​→pKS0​KS0​ and Λc+​→pKS0​η at Belle

Evidence for the singly Cabibbo-suppressed decay Ωc0​→Ξ−π+ and search for Ωc0​→Ξ−K+ and Ω−K+ decays at Belle

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

Measurements of branching fractions of Λc+​→Σ+η and Λc+​→Σ+η′ and asymmetry parameters of Λc+​→Σ+π0, Λc+​→Σ+η, and Λc+​→Σ+η′

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

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

Measurement of the Branching Fraction of $Λ_{c}^{+} \to p K_{S}^{0} π^{0}$ at Belle

Search for charmed baryons in the $Λ_{c}^{+} η$ system and measurement of the branching fractions of $Λ_{c} (2880)^{+}$ and $Λ_{c} (2940)^{+}$ decaying to $Λ_{c}^{+} η$ and $p D^{0}$ relative to $Σ_{c} (2455) π$

Search for Two-Body $B$ Meson Decays to $Λ^{0}$ and $Ω_{c}^{(*) 0}$

Search for a pentaquark state decaying into $p J / ψ$ in $Υ (1, 2 S)$ inclusive decays at Belle

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

Study of the lineshape of $X (3872)$ using $B$ decays to $D^{0} D^{* 0} K$

Measurement of the mass and width of the $Λ_{c} (2625)^{+}$ and the branching ratios of $Λ_{c} (2625)^{+} \to Σ_{c}^{0} π^{+}$ and $Λ_{c} (2625)^{+} \to Σ_{c}^{++} π^{-}$

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

Reconstruction of $B \to ρ ℓ ν_{ℓ}$ decays identified using hadronic decays of the recoil $B$ meson in 2019 -- 2021 Belle II data

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

First Observation of $Λ π^{+}$ and $Λ π^{-}$ Signals near the $K ˉ N (I = 1)$ Mass Threshold in $Λ_{c}^{+} \to Λ π^{+} π^{+} π^{-}$ Decay

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 fractions of $Λ_{c}^{+} \to p K_{S}^{0} K_{S}^{0}$ and $Λ_{c}^{+} \to p K_{S}^{0} η$ at Belle

Evidence for the singly Cabibbo-suppressed decay $Ω_{c}^{0} \to Ξ^{-} π^{+}$ and search for $Ω_{c}^{0} \to Ξ^{-} K^{+}$ and $Ω^{-} K^{+}$ decays at Belle

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

Measurements of branching fractions of $Λ_{c}^{+} \to Σ^{+} η$ and $Λ_{c}^{+} \to Σ^{+} η^{'}$ and asymmetry parameters of $Λ_{c}^{+} \to Σ^{+} π^{0}$ , $Λ_{c}^{+} \to Σ^{+} η$ , and $Λ_{c}^{+} \to Σ^{+} η^{'}$

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

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