S. Watanuki

activity

20132026

most citedHiggs Working Group Report of the Snowmass 2013 Community Planning Study

159 citations · 388 across the 54 of their papers we have counts for

collaborators

54 papers

hep-ex2026

Searches for charged-lepton-flavor violation in $χ_{b J} (1 P)$ decays

Belle, Belle II Collaborations, : +415

We report the first searches for charged-lepton-flavor violation in decays of $χ_{b J} (1 P)$ ( $J = 0, 1,$ and $2$ ) to a pair of charged leptons using 158 million $Υ (2 S)$ decays collect…

hep-ex2025

Measurement of time-dependent $C P$ asymmetries in $B^{0} \to K_{S}^{0} π^{+} π^{-} γ$ decays at Belle and Belle II

Belle, Belle II Collaborations, : +350

We present a measurement of the time-dependent $C P$ asymmetry in $B^{0} \to K_{S}^{0} π^{+} π^{-} γ$ decays using a data set of 365 fb $^{- 1}$ recorded by the Belle II experiment…

hep-ex2025

Determination of $∣ V_{c b} ∣$ using $B \to D ℓ ν_{ℓ}$ Decays at Belle II

Belle II Collaboration, I. Adachi, K. Adamczyk +407

We present a determination of the Cabibbo-Kobayashi-Maskawa matrix element $∣ V_{c b} ∣$ from the decay $B \to D ℓ ν_{ℓ}$ using a $365 fb^{- 1}$ $e^{+} e^{-} \to Υ (4 S) \to B B ˉ$ d…

hep-ex2025★ 1 cited

Measurement of the time-integrated $C P$ asymmetry in $D^{0} \to π^{0} π^{0}$ decays at Belle II

Belle II Collaboration, I. Adachi, Y. Ahn +372

We measure the time-integrated $C P$ asymmetry, $A_{C P}$ , in $D^{0} \to π^{0} π^{0}$ decays reconstructed in $e^{+} e^{-} \to c c ˉ$ events collected by Belle II during 2019--2022. The data cor…

hep-ex2025★ 8 cited

The Imaging Time-of-Propagation Detector at Belle II

Hulya Atmacan, Matt Belhorn, Yinghui Guan +92

We report on the construction, operation, and performance of the Time-of-Propagation detector with imaging used for the Belle II experiment running at the Super-KEKB $e^{+} e^{-}$ colli…

hep-ex2025★ 1 cited

Measurement of the time-integrated $C P$ asymmetry in $D^{0} \to K_{S}^{0} K_{S}^{0}$ decays using opposite-side flavor tagging at Belle and Belle II

Belle, Belle II Collaborations, : +378

We measure the time-integrated $C P$ asymmetry in $D^{0} \to K_{S}^{0} K_{S}^{0}$ decays reconstructed in $e^{+} e^{-} \to c c$ events collected by the Belle and Belle II exp…

hep-ex2025

Measurements of the branching fractions of $Ξ_{c}^{+} \to Σ^{+} K_{S}^{0}$ , $Ξ_{c}^{+} \to Ξ^{0} π^{+}$ , and $Ξ_{c}^{+} \to Ξ^{0} K^{+}$ at Belle and Belle II

Belle, Belle II Collaborations, : +357

Using 983.0 $fb^{- 1}$ and 427.9 $fb^{- 1}$ data samples collected with the Belle and Belle II detectors at the KEKB and SuperKEKB asymmetric energy $e^{+} e^{-}$ colliders, res…

hep-ex2024★ 5 cited

Observations of the singly Cabibbo-suppressed decays $Ξ_{c}^{+} \to p K_{S}^{0}$ , $Ξ_{c}^{+} \to Λ π^{+}$ , and $Ξ_{c}^{+} \to Σ^{0} π^{+}$ at Belle and Belle II

Belle, Belle II Collaborations, : +345

Using data samples of 983.0~ $f b^{- 1}$ and 427.9~ $f b^{- 1}$ accumulated with the Belle and Belle~II detectors operating at the KEKB and SuperKEKB asymmetric-energy $e^{+} e^{-}$ c…

hep-ex2024★ 2 cited

Observation of the decay $B^{0} \to J / ψ ω$ at Belle II

Belle II Collaboration, I. Adachi, L. Aggarwal +383

We measure the branching fraction of the decay $B^{0} \to J / ψ ω$ using data collected with the Belle II detector at the SuperKEKB collider. The data contain $(387 \pm 6) \times 1 0^{6}$ …

hep-ex2024★ 2 cited

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

Belle II Collaboration, I. Adachi, L. Aggarwal +436

We report measurements of time-dependent $C P$ asymmetries in $B^{0} \to K_{S}^{0} π^{0} γ$ decays based on a data sample of $(388 \pm 6) \times 1 0^{6}$ $B B ˉ$ events collected at the $Υ (4 S)$ …

hep-ex2024★ 2 cited

Measurement of the branching fractions of $B ˉ \to D^{()} K^{-} K_{(S)}^{() 0}$ and $B ˉ \to D^{(*)} D_{s}^{-}$ decays at Belle II

Belle II Collaboration, I. Adachi, L. Aggarwal +404

We present measurements of the branching fractions of eight $B^{0} \to D^{(*) +} K^{-} K_{(S)}^{(*) 0}$ , $B^{-} \to D^{(*) 0} K^{-} K_{(S)}^{(*) 0}$ decay channels. The results are…

hep-ex2024★ 4 cited

Search for the decay $B^{0} \to γ γ$ using Belle and Belle II data

Belle, Belle II Collaborations, : +407

We report the result of a search for the rare decay $B^{0} \to γ γ$ using a combined dataset of $753 \times 1 0^{6}$ $B B ˉ$ pairs collected by the Belle experiment and $387\times10…

hep-ex2024★ 2 cited

Measurement of the branching fraction of the decay $B^{-} \to D^{0} ρ (770)^{-}$ at Belle II

Belle II Collaboration, I. Adachi, L. Aggarwal +389

We measure the branching fraction of the decay $B^{-} \to D^{0} ρ (770)^{-}$ using data collected with the Belle II detector. The data contain 387 million $B B$ pairs produced i…

hep-ex2024★ 8 cited

Measurement of the $e^{+} e^{-} \to π^{+} π^{-} π^{0}$ cross section in the energy range 0.62-3.50 GeV at Belle II

Belle II Collaboration, I. Adachi, L. Aggarwal +360

We report a measurement of the $e^{+} e^{-} \to π^{+} π^{-} π^{0}$ cross section in the energy range from 0.62 to 3.50 GeV using an initial-state radiation technique. We use an $e^{+} e^{-}$ data sa…

hep-ex2024

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

Belle II Collaboration, I. Adachi, L. Aggarwal +399

We describe a measurement of charge-parity ( $C P$ ) violation asymmetries in $B^{0} \to η^{'} K_{S}^{0}$ decays using Belle II data. We consider $η^{'} \to η (\to γ γ) π^{+} π^{-}$ and $η^{'} \to ρ (\to π^{+} π^{-}) γ$ de…

hep-ex2023

Search for the decay $B_{s}^{0} \to J / ψ π^{0}$ at Belle experiment

Belle Collaboration, D. Kumar, B. Bhuyan +164

We have analyzed 121.4 fb $^{- 1}$ of data collected at the $Υ (5 S)$ resonance by the Belle experiment using the KEKB asymmetric-energy $e^{+} e^{-}$ collider to search for the decay $B_s^…

hep-ex2023★ 10 cited

First Measurement of $R (X_{τ / ℓ})$ as an Inclusive Test of the $b \to c τ ν$ Anomaly

Belle II Collaboration, I. Adachi, K. Adamczyk +390

We measure the tau-to-light-lepton ratio of inclusive $B$ -meson branching fractions $R (X_{τ / ℓ}) \equiv B (B \to X τ ν) / B (B \to X ℓ ν)$ , where $ℓ$ indicate…

hep-ex2023★ 20 cited

Determination of $∣ V_{c b} ∣$ using $B^{0} \to D^{*+} ℓ^{-} ν ˉ_{ℓ}$ decays with Belle II

Belle II Collaboration, I. Adachi, K. Adamczyk +416

We determine the CKM matrix-element magnitude $∣ V_{c b} ∣$ using $B^{0} \to D^{*+} ℓ^{-} ν ˉ_{ℓ}$ decays reconstructed in $189 fb^{- 1}$ of collision data collec…

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★ 4 cited

Measurement of the $e^{+} e^{-} \to B_{s}^{0} B ˉ_{s}^{0} X$ cross section in the energy range from $10.63$ to $11.02$ GeV using inclusive $D_{s}^{\pm}$ and $D^{0}$ production

Belle Collaboration, V. Zhukova, R. Mizuk +188

We report the first measurement of the inclusive $e^{+} e^{-} \to b b ˉ \to D_{s}^{\pm} X$ and $e^{+} e^{-} \to b b ˉ \to D^{0} / D ˉ^{0} X$ cross sections in the energy range from $10.63$ t…

hep-ex2023★ 6 cited

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

Belle II Collaboration, I. Adachi, K. Adamczyk +399

We report a measurement of the $C P$ -violating parameters $A$ and $S$ in $B^{0} \to K_{S}^{0} π^{0}$ decays at Belle II using a sample of $387 \times 1 0^{6}$ $B B ˉ$ events recor…

hep-ex2023★ 5 cited

Study of the muon decay-in-flight in the $τ^{-} \to μ^{-} ν ˉ_{μ} ν_{τ}$ decay to measure the Michel parameter $ξ^{'}$

Belle Collaboration, D. Bodrov, P. Pakhlov +192

We present the first measurement of the Michel parameter $ξ^{'}$ in the $τ^{-} \to μ^{-} ν ˉ_{μ} ν_{τ}$ decay using the full data sample of $988 fb^{- 1}$ collected by the Belle de…

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…

Searches for charged-lepton-flavor violation in χbJ​(1P) decays

Measurement of time-dependent CP asymmetries in B0→KS0​π+π−γ decays at Belle and Belle II

Determination of ∣Vcb​∣ using B→Dℓνℓ​ Decays at Belle II

Measurement of the time-integrated CP asymmetry in D0→π0π0 decays at Belle II

The Imaging Time-of-Propagation Detector at Belle II

Measurement of the time-integrated CP asymmetry in D0→KS0​KS0​ decays using opposite-side flavor tagging at Belle and Belle II

Measurements of the branching fractions of Ξc+​→Σ+KS0​, Ξc+​→Ξ0π+, and Ξc+​→Ξ0K+ at Belle and Belle II

Observations of the singly Cabibbo-suppressed decays Ξc+​→pKS0​, Ξc+​→Λπ+, and Ξc+​→Σ0π+ at Belle and Belle II

Observation of the decay B0→J/ψω at Belle II

Measurement of CP asymmetries in B0→KS0​π0γ decays at Belle II

Measurement of the branching fractions of Bˉ→D(∗)K−K(S)(∗)0​ and Bˉ→D(∗)Ds−​ decays at Belle II

Search for the decay B0→γγ using Belle and Belle II data

Measurement of the branching fraction of the decay B−→D0ρ(770)− at Belle II

Measurement of the e+e−→π+π−π0 cross section in the energy range 0.62-3.50 GeV at Belle II

Measurement of CP asymmetries in B0→η′Ks0​ decays at Belle II

Search for the decay Bs0​→J/ψπ0 at Belle experiment

First Measurement of R(Xτ/ℓ​) as an Inclusive Test of the b→cτν Anomaly

Determination of ∣Vcb​∣ using B0→D∗+ℓ−νˉℓ​ decays with Belle II

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

Measurement of the e+e−→Bs0​Bˉs0​X cross section in the energy range from 10.63 to 11.02 GeV using inclusive Ds±​ and D0 production

Measurement of CP violation in B0→KS0​π0 decays at Belle II

Study of the muon decay-in-flight in the τ−→μ−νˉμ​ντ​ decay to measure the Michel parameter ξ′

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

Searches for charged-lepton-flavor violation in $χ_{b J} (1 P)$ decays

Measurement of time-dependent $C P$ asymmetries in $B^{0} \to K_{S}^{0} π^{+} π^{-} γ$ decays at Belle and Belle II

Determination of $∣ V_{c b} ∣$ using $B \to D ℓ ν_{ℓ}$ Decays at Belle II

Measurement of the time-integrated $C P$ asymmetry in $D^{0} \to π^{0} π^{0}$ decays at Belle II

Measurement of the time-integrated $C P$ asymmetry in $D^{0} \to K_{S}^{0} K_{S}^{0}$ decays using opposite-side flavor tagging at Belle and Belle II

Measurements of the branching fractions of $Ξ_{c}^{+} \to Σ^{+} K_{S}^{0}$ , $Ξ_{c}^{+} \to Ξ^{0} π^{+}$ , and $Ξ_{c}^{+} \to Ξ^{0} K^{+}$ at Belle and Belle II

Observations of the singly Cabibbo-suppressed decays $Ξ_{c}^{+} \to p K_{S}^{0}$ , $Ξ_{c}^{+} \to Λ π^{+}$ , and $Ξ_{c}^{+} \to Σ^{0} π^{+}$ at Belle and Belle II

Observation of the decay $B^{0} \to J / ψ ω$ at Belle II

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

Measurement of the branching fractions of $B ˉ \to D^{()} K^{-} K_{(S)}^{() 0}$ and $B ˉ \to D^{(*)} D_{s}^{-}$ decays at Belle II

Search for the decay $B^{0} \to γ γ$ using Belle and Belle II data

Measurement of the branching fraction of the decay $B^{-} \to D^{0} ρ (770)^{-}$ at Belle II

Measurement of the $e^{+} e^{-} \to π^{+} π^{-} π^{0}$ cross section in the energy range 0.62-3.50 GeV at Belle II

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

Search for the decay $B_{s}^{0} \to J / ψ π^{0}$ at Belle experiment

First Measurement of $R (X_{τ / ℓ})$ as an Inclusive Test of the $b \to c τ ν$ Anomaly

Determination of $∣ V_{c b} ∣$ using $B^{0} \to D^{*+} ℓ^{-} ν ˉ_{ℓ}$ decays with Belle II

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

Measurement of the $e^{+} e^{-} \to B_{s}^{0} B ˉ_{s}^{0} X$ cross section in the energy range from $10.63$ to $11.02$ GeV using inclusive $D_{s}^{\pm}$ and $D^{0}$ production

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

Study of the muon decay-in-flight in the $τ^{-} \to μ^{-} ν ˉ_{μ} ν_{τ}$ decay to measure the Michel parameter $ξ^{'}$

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 $Λ_{c} (2625)^{+} \to Σ_{c}^{++} π^{-}$