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Article
Open AccessMeasurement of branching-fraction ratios and CP asymmetries in B± → DCP±K± decays at Belle and Belle II
We report results from a study of B± → DK± decays followed by D decaying to the CP-even final state K+K− and CP-odd final state ...
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Article
Open AccessSearch for charged-lepton flavor violation in Υ(2S) → ℓ∓τ± (ℓ = e, μ) decays at Belle
We report a search for the charged-lepton flavor violation in Υ(2S) → ℓ∓τ± (ℓ = e, μ) decays using a 25 fb−1 Υ(2S) sample collected by the Belle detector at the KEKB e+e− asymmetric-energy collider. We find no ev...
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Article
Open AccessMeasurement of CP asymmetries and branching-fraction ratios for B± → DK± and Dπ± with D → \( {K}_{\textrm{S}}^0 \) K±π∓ using Belle and Belle II data
We measure CP asymmetries and branching-fraction ratios for B± → DK± and Dπ± decays with D → K ...
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Article
Open AccessSearch for \( {\textrm{B}}_{\textrm{s}}^0 \) → ℓ∓τ± with the semi-leptonic tagging method at Belle
We present a search for the lepton-flavor-violating decays B s ...
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Article
Open AccessSearch for the double-charmonium state with ηcJ/ψ at Belle
We measure the cross section of e+e− → ηcJ/ψ at the Υ(nS)(n = 1–5) on-resonance and 10.52 GeV off-resonance energy points using the full data sample collected by the Belle detector with an integrated luminosity o...
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Article
Open AccessSearch for lepton-flavor-violating τ decays into a lepton and a vector meson using the full Belle data sample
Charged-lepton-flavor-violation is predicted in several new physics scenarios. We update the analysis of τ lepton decays into a light charged lepton (ℓ = e± or μ±) and a vector meson (V0 = ρ0, ϕ, ω, K*0, or ...
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Article
Open AccessStabilizing electromagnons in CuO under pressure
Electromagnons (Electroactive spin wave excitations) could prove to be decisive in information technologies but they remain fragile quantum objects, mainly existing at low temperatures. Any future technologica...
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Article
Open AccessEvidence for the singly Cabibbo-suppressed decay \( {\Omega}_c^0\to {\**}^{-}{\pi}^{+} \) and search for \( {\Omega}_c^0\to {\**}^{-}{K}^{+} \) and Ω−K+ decays at Belle
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 decays
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Article
Open AccessErratum to: Combined analysis of Belle and Belle II data to determine the CKM angle ϕ3 using B+ → D( \( {\textrm{K}}_{\textrm{S}}^0 \) h+h−)h+ decays
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Article
Open AccessSearch for charged lepton flavor violating decays of ϒ (1S)
We present a search for the charged lepton-flavor-violating decays ϒ(1S) → ℓ±ℓ′∓ and radiative charged lepton-flavour-violating decays ϒ(1S) → γℓ±ℓ′∓ [ℓ,ℓ′ = e, μ, τ] using the 158 million ϒ(2S) sample collected ...
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Article
Open AccessAn improved search for the electric dipole moment of the τ lepton
We report a measurement of the electric dipole moment of the τ lepton (dτ) using an 833 fb−1 data sample collected near the Υ(4S) resonance, with the Belle detector at the KEKB asymmetric-energy e+e− collider. Us...
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Article
Open AccessCombined analysis of Belle and Belle II data to determine the CKM angle ϕ3 using B+ → D( \( {K}_S^0 \) h+h−)h+ decays
We present a measurement of the Cabibbo-Kobayashi-Maskawa unitarity triangle angle ϕ3 (also known as γ) using a model-independent Dalitz plot analysis of B+ → D (
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Article
Open AccessSearch for lepton-flavor-violating tau-lepton decays to ℓγ at Belle
Charged lepton flavor violation is forbidden in the Standard Model but possible in several new physics scenarios. In many of these models, the radiative decays τ± → ℓ±γ (ℓ = e, μ) are predicted to have a sizeable...
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Article
Open AccessMeasurements of branching fractions and asymmetry parameters of \( {\**}_c^0\to \Lambda {\overline{K}}^{\ast 0} \) , \( {\**}_c^0\to {\Sigma}^0{\overline{K}}^{\ast 0} \) , and \( {\**}_c^0\to {\Sigma}^{+}{K}^{\ast -} \) decays at Belle
Using a data sample of 980 fb−1 collected with the Belle detector at the KEKB asymmetric-energy e+e− collider, we study the processes of ...
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Article
Open AccessMeasurement of the energy dependence of the e+e− → \( B\overline{B} \) , \( B{\overline{B}}^{\ast } \) and \( {B}^{\ast }{\overline{B}}^{\ast } \) exclusive cross sections
We report the first measurement of the exclusive cross sections e+e− → B B ...
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Article
Open AccessSearch for the dark photon in B0 → A′A′, A′ → e+e−, μ+μ−, and π+π− decays at Belle
We present a search for the dark photon A′ in the B0 → A′A′ decays, where A′ subsequently decays to e+e−, μ+μ−, and π+π−. The search is performed by analyzing 772 × 106
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Article
Open AccessTest of lepton flavor universality and search for lepton flavor violation in B → Kℓℓ decays
We present measurements of the branching fractions for the decays B → Kμ+μ− and B → Ke+e−, and their ratio (RK), using a data sample of 711 fb−1 that contains 772 × 106
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Article
Open AccessObservation of a new structure near 10.75 GeV in the energy dependence of the e+e−→ ϒ (nS)π+π− (n = 1, 2, 3) cross sections
We report a new measurement of the e+e−→ ϒ(nS)π+π− (n = 1, 2, 3) cross sections at energies from 10.52 to 11.02 GeV using data collected with the Belle detector at the KEKB asymmetric-energy e+e− collider. We obs...
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Article
Open AccessFirst measurement of the CKM angle ϕ3 with B±→ D( \( {K}_{\mathrm{S}}^0 \) π+π−π0) K± decays
We present the first model-independent measurement of the CKM unitarity triangle angle ϕ3 using B±→ D(
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Article
Open AccessEvidence of a structure in \(\bar{K}^{0} \Lambda _{c}^{+}\) consistent with a charged \(\** _c(2930)^{+}\) , and updated measurement of \(\bar{B}^{0} \rightarrow \bar{K}^{0} \Lambda _{c}^{+} \bar{\Lambda }_{c}^{-}\) at Belle
We report evidence for the charged charmed-strange baryon \(\** _{c}(2930)^+\) ...
