B. G. Cheon
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View article: Model-agnostic likelihood for the reinterpretation of the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mrow> <mml:msup> <mml:mrow> <mml:mi>B</mml:mi> </mml:mrow> <mml:mrow> <mml:mo>+</mml:mo> </mml:mrow> </mml:msup> <mml:mo stretchy="false">→</mml:mo> <mml:msup> <mml:mrow> <mml:mi>K</mml:mi> </mml:mrow> <mml:mrow> <mml:mo>+</mml:mo> </mml:mrow> </mml:msup> <mml:mi>v</mml:mi> <mml:mover accent="true"> <mml:mrow> <mml:mi>v</mml:mi> </mml:mrow> <mml:mrow> <mml:mo stretchy="false">¯</mml:mo> </mml:mrow> </mml:mover> </mml:mrow> </mml:math> measurement at Belle II
Model-agnostic likelihood for the reinterpretation of the measurement at Belle II Open
We recently measured the branching fraction of the B + → K + ν ν ¯ decay using 362 fb − 1 of on-resonance e + e − collision data under the assumption of Standard Model kinematics, providing the first evidence fo…
View article: Observation of the radiative decay $D_s (2317)^+ \to D_s^* γ$
Observation of the radiative decay $D_s (2317)^+ \to D_s^* γ$ Open
We observe the radiative decay $D^{*}_{s0}(2317)^{+} \to D_{s}^{*+} γ$ for the first time, with a significance exceeding $10$ standard deviations. The signal is found in the continuum $e^+ e^- \to c\bar{c}$ process with the combined data s…
View article: Time‐Resolved Leader Spectra of Downward Terrestrial Gamma‐Ray Flashes Observed at the Telescope Array Surface Detector
Time‐Resolved Leader Spectra of Downward Terrestrial Gamma‐Ray Flashes Observed at the Telescope Array Surface Detector Open
The first time‐resolved leader spectra associated with a downward Terrestrial Gamma‐ray Flash (TGF) observed by the Telescope Array Surface Detector (TASD) were recently reported by Kieu et al. (2024, https://doi.org/10.1029/2024JD041720 )…
View article: Measurement of the $ D^{0}\rightarrow K^{-}π^{+}e^{+}e^{-} $ branching fraction and search for $ D^{0}\rightarrow π^{+}π^{-}e^{+}e^{-} $ and $D^{0}\rightarrow K^{+}K^{-}e^{+}e^{-} $ decays at Belle
Measurement of the $ D^{0}\rightarrow K^{-}π^{+}e^{+}e^{-} $ branching fraction and search for $ D^{0}\rightarrow π^{+}π^{-}e^{+}e^{-} $ and $D^{0}\rightarrow K^{+}K^{-}e^{+}e^{-} $ decays at Belle Open
We present a study of the rare charm meson decays $ D^{0}\rightarrow K^{+}K^{-}e^{+}e^{-} $, $ π^{+}π^{-}e^{+}e^{-} $, and $ K^{-}π^{+}e^{+}e^{-} $ using a 942 fb$^{-1}$ data set collected by the Belle detector at the KEKB asymmetric-energ…
View article: Search for $B^0 \to K^{\ast 0} \tau^+ \tau^-$ decays at the Belle II experiment
Search for $B^0 \to K^{\ast 0} \tau^+ \tau^-$ decays at the Belle II experiment Open
We present a search for the rare flavor-changing neutral-current decay $B^0 \to K^{\ast 0} \tau^+ \tau^-$ with data collected by the Belle II experiment at the SuperKEKB electron-positron collider. The analysis uses a 365 fb$^{-1}$ data sa…
View article: Evidence of the P$_{c\bar{c}s}$(4459)$^0$ in Upsilon(1S, 2S) inclusive decays at Belle
Evidence of the P$_{c\bar{c}s}$(4459)$^0$ in Upsilon(1S, 2S) inclusive decays at Belle Open
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 for [udsccbar] pentaquark states decaying to Jpsi Lambda. Us…
View article: Observation of the decay $B^0 \to J/ψω$ at Belle II
Observation of the decay $B^0 \to J/ψω$ at Belle II Open
We measure the branching fraction of the decay $B^0 \to J/ψω$ using data collected with the Belle II detector at the SuperKEKB collider. The data contain $(387 \pm 6) \times 10^6$ $B\overline{B}$ meson pairs produced in energy-asymmetric $…
View article: New graph-neural-network flavor tagger for Belle II and measurement of sin <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mn>2</mml:mn><mml:msub><mml:mi>ϕ</mml:mi><mml:mn>1</mml:mn></mml:msub></mml:math> in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>B</mml:mi><mml:mn>0</mml:mn></mml:msup><mml:mo stretchy="false">→</mml:mo><mml:mi>J</mml:mi><mml:mo>/</mml:mo><mml:mi>ψ</mml:mi><mml:msubsup><mml:mi>K</mml:mi><mml:mi mathvariant="normal">S</mml:mi><mml:mn>0</mml:mn></mml:msubsup></mml:math> decays
New graph-neural-network flavor tagger for Belle II and measurement of sin in decays Open
We present GFlaT, a new algorithm that uses a graph-neural-network to determine the flavor of neutral B mesons produced in ϒ(4S) decays. It improves previous algorithms by using the information from all charged final-state particles and th…
View article: Measurement of the branching fraction of the decay <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>B</mml:mi><mml:mo>−</mml:mo></mml:msup><mml:mo stretchy="false">→</mml:mo><mml:msup><mml:mi>D</mml:mi><mml:mn>0</mml:mn></mml:msup><mml:mi>ρ</mml:mi><mml:mo stretchy="false">(</mml:mo><mml:mn>770</mml:mn><mml:msup><mml:mo stretchy="false">)</mml:mo><mml:mo>−</mml:mo></mml:msup></mml:math> at Belle II
Measurement of the branching fraction of the decay at Belle II Open
We measure the branching fraction of the decay B−→D0ρ(770)− using data collected with the Belle II detector. The data contain 387 million BB¯ pairs produced in e+e− collisions at the ϒ(4S) resonance. We reconstruct 8360±180 decays from an …
View article: Observation of Declination Dependence in the Cosmic Ray Energy Spectrum
Observation of Declination Dependence in the Cosmic Ray Energy Spectrum Open
We report on an observation of the difference between northern and southern skies of the ultrahigh energy cosmic ray energy spectrum with a significance of ${\sim}8σ$. We use measurements from the two largest experiments$\unicode{x2014}$th…
View article: Search for a heavy neutral lepton that mixes predominantly with the tau neutrino
Search for a heavy neutral lepton that mixes predominantly with the tau neutrino Open
We report a search for a heavy neutral lepton (HNL) that mixes predominantly with ντ. The search utilizes data collected with the Belle detector at the KEKB asymmetric energy e+e− collider. The data sample was collected at and just below t…
View article: Measurement of branching-fraction ratios and CP asymmetries in B± → DCP±K± decays at Belle and Belle II
Measurement of branching-fraction ratios and CP asymmetries in B± → DCP±K± decays at Belle and Belle II Open
View article: Angular analysis of $B \to K^* e^+ e^-$ in the low-$q^2$ region with new electron identification at Belle
Angular analysis of $B \to K^* e^+ e^-$ in the low-$q^2$ region with new electron identification at Belle Open
We perform an angular analysis of the $B\to K^* e^+ e^-$ decay for the dielectron mass squared, $q^2$, range of $0.0008$ to $1.1200 ~\text{GeV}^2 /c^4$ using the full Belle data set in the $K^{*0} \to K^+ π^-$ and $K^{*+} \to K_S^0 π^+$ ch…
View article: Search for a pentaquark state decaying into $pJ/ψ$ in $Υ(1,2S)$ inclusive decays at Belle
Search for a pentaquark state decaying into $pJ/ψ$ in $Υ(1,2S)$ inclusive decays at Belle Open
Using the data samples of 102 million $Υ(1S)$ and 158 million $Υ(2S)$ events collected by the Belle detector, we search for a pentaquark state in the $pJ/ψ$ final state from $Υ(1,2S)$ inclusive decays. Here, the charge-conjugate $\bar{p}J/…
View article: Search for charged-lepton flavor violation in Υ(2S) → ℓ∓τ± (ℓ = e, μ) decays at Belle
Search for charged-lepton flavor violation in Υ(2S) → ℓ∓τ± (ℓ = e, μ) decays at Belle Open
A bstract We report a search for the charged-lepton flavor violation in Υ(2 S ) → ℓ ∓ τ ± ( ℓ = e, μ ) decays using a 25 fb − 1 Υ(2 S ) sample collected by the Belle detector at the KEKB e + e − asymmetric-energy collider. We find no evide…
View article: Study of $Υ(10753)$ decays to $π^{+}π^{-}Υ(nS)$ final states at Belle II
Study of $Υ(10753)$ decays to $π^{+}π^{-}Υ(nS)$ final states at Belle II Open
We present an analysis of the process $e^{+}e^{-}\toπ^{+}π^{-}Υ(nS)$ (where $n$ = 1, 2, or 3) reconstructed in $19.6\rm$ $\rm fb^{-1}$ of Belle II data during a special run of the SuperKEKB collider at four energy points near the peak of t…
View article: Search for Baryon-Number-Violating Processes in $B^-$ Decays to the $\barΞ_{c}^{0} \barΛ_{c}^{-}$ Final State
Search for Baryon-Number-Violating Processes in $B^-$ Decays to the $\barΞ_{c}^{0} \barΛ_{c}^{-}$ Final State Open
We report the results of the first search for $B^-$ decays to the $\barΞ_{c}^{0} \barΛ_{c}^{-}$ final state using 711~${\rm fb^{-1}}$ of data collected at the $Υ(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^+ e^-…
View article: Measurements of the branching fraction, polarization, and $CP$ asymmetry for the decay $B^0\rightarrow ωω$
Measurements of the branching fraction, polarization, and $CP$ asymmetry for the decay $B^0\rightarrow ωω$ Open
We present a measurement of $B^{0} \rightarrow ωω$, a charmless decay into two vector mesons, using 772 $\times 10^6$ $B\overline{B}$ pairs collected with the Belle detector at the KEKB $e^+e^-$ collider. The decay is observed with a signi…
View article: Search for the decay $B^{0}\to\gamma\gamma$ using Belle and Belle II data
Search for the decay $B^{0}\to\gamma\gamma$ using Belle and Belle II data Open
We report the result of a search for the rare decay $B^{0} \to \gamma \gamma$ using a combined dataset of $753\times10^{6}$$B\bar{B}$ pairs collected by the Belle experiment and $387\times10^{6}$$B\bar{B}$ pairs collected by the Belle II e…
View article: A test of lepton flavor universality with a measurement of $R(D^{*})$ using hadronic $B$ tagging at the Belle II experiment
A test of lepton flavor universality with a measurement of $R(D^{*})$ using hadronic $B$ tagging at the Belle II experiment Open
The ratio of branching fractions $R(D^{*}) = \mathcal{B}(\overline{B} \rightarrow D^{*} \tau^{-} \overline{\nu}_{\tau})$/$\mathcal{B} (\overline{B} \rightarrow D^{*} \ell^{-} \overline{\nu}_{\ell})$, where $\ell$ is an electron or muon, is…
View article: Measurement of the energy dependence of the $e^+e^- \to B\bar{B}$, $B\bar{B}{}^*$, and $B^*\bar{B}{}^*$ cross sections at Belle~II
Measurement of the energy dependence of the $e^+e^- \to B\bar{B}$, $B\bar{B}{}^*$, and $B^*\bar{B}{}^*$ cross sections at Belle~II Open
We report measurements of the $e^+e^- \to B\bar{B}$, $B\bar{B}{}^*$, and $B^*\bar{B}{}^*$ cross sections at four energies, 10653, 10701, 10746 and 10805 MeV, using data collected by the Belle~II experiment. We reconstruct one $B$ meson in …
View article: Measurement of the branching fraction, polarization, and time-dependent $CP$ asymmetry in $B^0 \to \rho^+\rho^-$ decays and constraint on the CKM angle $\phi_2$
Measurement of the branching fraction, polarization, and time-dependent $CP$ asymmetry in $B^0 \to \rho^+\rho^-$ decays and constraint on the CKM angle $\phi_2$ Open
We present a measurement of the branching fraction and fraction of longitudinal polarization of $B^0 \to \rho^+ \rho^-$ decays, which have two $\pi^0$'s in the final state. We also measure time-dependent $CP$ violation parameters for decay…
View article: Determination of the CKM angle ϕ$_{3}$ from a combination of Belle and Belle II results
Determination of the CKM angle ϕ$_{3}$ from a combination of Belle and Belle II results Open
We report a determination of the CKM angle ϕ$_{3}$, also known as γ, from a combination of measurements using samples of up to 711 fb$^{−1}$ from the Belle experiment and up to 362 fb$^{−1}$ from the Belle II experiment. We combine results…
View article: Search for rare $b \to d\ell^+\ell^-$ transitions at Belle
Search for rare $b \to d\ell^+\ell^-$ transitions at Belle Open
We present the results of a search for the $b \to d\ell^+\ell^-$ flavor-changing neutral-current rare decays $B^{+, 0} \to (\eta, \omega, \pi^{+,0}, \rho^{+, 0}) e^+e^-$ and $B^{+, 0} \to (\eta, \omega, \pi^{0}, \rho^{+}) \mu^+\mu^-$ using…
View article: Model-independent measurement of $D^0$-$\overline{D}{}^0$ mixing parameters in $D^0\rightarrow K^0_{S}\pi^+\pi^-$ decays at Belle and Belle II
Model-independent measurement of $D^0$-$\overline{D}{}^0$ mixing parameters in $D^0\rightarrow K^0_{S}\pi^+\pi^-$ decays at Belle and Belle II Open
We perform a model-independent measurement of the $D^0$-$\overline{D}{}^0$ mixing parameters using samples of $e^+e^-$-collision data collected by the Belle and Belle II experiments that have integrated luminosities of $951\ \text{fb}^{-1}…
View article: Measurement of $CP$ asymmetries in $B^0 \rightarrow K^0_S K^0_S K^0_S$ decays at Belle II
Measurement of $CP$ asymmetries in $B^0 \rightarrow K^0_S K^0_S K^0_S$ decays at Belle II Open
We report a measurement of decay-time dependent charge-parity ($CP$) asymmetries in $B^0 \rightarrow K^0_S K^0_S K^0_S$ decays. We use $387 \times 10^6 B\bar{B}$ pairs collected at the $\Upsilon(4S)$ resonance with the Belle II detector at…
View article: Measurement of $CP$ asymmetries in $B^0\to\eta'K^0_s$ decays at Belle II
Measurement of $CP$ asymmetries in $B^0\to\eta'K^0_s$ decays at Belle II Open
We describe a measurement of charge-parity ($CP$) violation asymmetries in $B^0\to\eta'K^0_S$ decays using Belle II data. We consider $\eta'\to\eta(\to\gamma\gamma)\pi^+\pi^-$ and $\eta'\to\rho(\to\pi^+\pi^-)\gamma$ decays. The data were c…
View article: Search for the baryon number and lepton number violating decays $\tau^-\to \Lambda\pi^-$ and $\tau^-\to \bar{\Lambda}\pi^-$ at Belle II
Search for the baryon number and lepton number violating decays $\tau^-\to \Lambda\pi^-$ and $\tau^-\to \bar{\Lambda}\pi^-$ at Belle II Open
We present a search for the baryon number $B$ and lepton number $L$ violating decays $\tau^- \rightarrow \Lambda \pi^-$ and $\tau^- \rightarrow \bar{\Lambda} \pi^-$ produced from the $e^+e^-\to \tau^+\tau^-$ process, using a 364 fb$^{-1}$ …
View article: Search for the $e^+e^-\toη_{b}(1S)ω$ and $e^+e^-\toχ_{b0}(1P)ω$ processes at $\sqrt{s}=10.745\,\mathrm{GeV}$
Search for the $e^+e^-\toη_{b}(1S)ω$ and $e^+e^-\toχ_{b0}(1P)ω$ processes at $\sqrt{s}=10.745\,\mathrm{GeV}$ Open
We search for the $e^+e^-\toη_b(1S)ω$ and $e^+e^-\toχ_{b0}(1P)ω$ processes at a center-of-mass energy of 10.745 GeV, which is close to the peak of the $Υ(10753)$ state. We use data collected by the Belle II experiment during a special run,…
View article: Measurement of branching fractions and direct $CP$ asymmetries for $B \to Kπ$ and $B\toππ$ decays at Belle II
Measurement of branching fractions and direct $CP$ asymmetries for $B \to Kπ$ and $B\toππ$ decays at Belle II Open
We report measurements of the branching fractions and direct $\it{CP}$ asymmetries of the decays $B^0 \to K^+ π^-$, $B^+ \to K^+ π^0$, $B^+ \to K^0 π^+$, and $B^0 \to K^0 π^0$, and use these for testing the standard model through an isospi…