A. Bondar
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View article: Search for an axion-like particle in B → K(*)a(→ γγ) decays at Belle
Search for an axion-like particle in B → K(*)a(→ γγ) decays at Belle Open
A bstract We report a search for an axion-like particle a in B → K (*) a decays using data collected with the Belle detector at the KEKB asymmetric-energy electron-positron collider. The search is based on a 711 fb − 1 data sample collecte…
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: On the determination of the relative probability of $${\varUpsilon }(5S) \rightarrow B^{(*)}_s\bar{B}^{(*)}_s$$ decays
On the determination of the relative probability of $${\varUpsilon }(5S) \rightarrow B^{(*)}_s\bar{B}^{(*)}_s$$ decays Open
Semileptonic decays of the $$B \overline{B}$$ pairs produced in the $${\varUpsilon }(5S)$$ can be used to find the relative probability of $${\varUpsilon }(5\,S) \rightarrow B_s \overline{B}_s$$ decays. This c…
View article: New measurement of D0 and D+ meson masses with the KEDR detector
New measurement of D0 and D+ meson masses with the KEDR detector Open
A bstract Using the 4.9 pb −1 statistics collected at the peak of the ψ (3770) resonance with the KEDR detector at the VEPP-4M electron-positron collider, we measured the masses of the neutral and charged D mesons: $$\begin{array}{c}{M}_{{…
View article: Charged-hadron identification at Belle II
Charged-hadron identification at Belle II Open
The Belle II experiment’s ability to identify particles critically affects the sensitivity of its measurements. We describe Belle II’s algorithms for identifying charged particles and evaluate their performance in separating pions, kaons, …
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: Search for <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:mn>0</mml:mn></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:mn>0</mml:mn></mml:mrow></mml:msup><mml:msup><mml:mrow><mml:mi>τ</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup><mml:msup><mml:mrow><mml:mi>τ</mml:mi></mml:mrow><mml:mrow><mml:mo>−</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math> Decays at the Belle II Experiment
Search for Decays at the Belle II Experiment Open
We present a search for the rare flavor-changing neutral-current decay B0→K*0τ+τ− with data collected by the Belle II experiment at the SuperKEKB electron-positron collider. The analysis uses a 365 fb−1 data sample recorded at the center-…
View article: Measurement of <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>τ</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:msub><mml:mi>ν</mml:mi><mml:mi>τ</mml:mi></mml:msub></mml:math> branching fraction with a hadronic tagging method at Belle II
Measurement of branching fraction with a hadronic tagging method at Belle II Open
We present a measurement of the branching fraction of B+→τ+ντ decays using 387±6×106 ϒ(4S) collected between 2019 and 2022 with the Belle II detector at the SuperKEKB e+e− collider. We reconstruct the accompanying B− meson using the hadron…
Measurement of the branching fraction and search for and decays at Belle Open
View article: Search for a Dark Higgs Boson Produced in Association with Inelastic Dark Matter at the Belle II Experiment
Search for a Dark Higgs Boson Produced in Association with Inelastic Dark Matter at the Belle II Experiment Open
Inelastic dark matter models that have two dark matter particles and a massive dark photon can reproduce the observed relic dark matter density without violating cosmological limits. The mass splitting between the two dark matter particles…
View article: Measurement of B → K*(892)γ decays at Belle II
Measurement of B → K*(892)γ decays at Belle II Open
A bstract We present measurements of B → K * (892) γ decays using 365 fb − 1 of data collected from 2019 to 2022 by the Belle II experiment at the SuperKEKB asymmetric-energy e + e − collider. The data sample contains (387 ± 6) × 10 6 Υ(4 …
View article: Relativistic effects in M1 radiative decays of heavy-light mesons
Relativistic effects in M1 radiative decays of heavy-light mesons Open
We discuss the M1 radiative transitions D*→Dγ, Ds*→Dsγ, B*→Bγ, and Bs*→Bsγ. A relativistic potential model is proposed. The corresponding Hamiltonian, when expanded to terms of the order of v2/c2, where v are the quark velocities, coincide…
View article: Measurements of the branching fractions of $${\Xi }_{c}^{+}\to {\Sigma }^{+}{K}_{S}^{0}$$, $${\Xi }_{c}^{+}\to {\Xi }^{0}{\pi }^{+}$$, and $${\Xi }_{c}^{+}\to {\Xi }^{0}{K}+$$ at Belle and Belle II
Measurements of the branching fractions of $${\Xi }_{c}^{+}\to {\Sigma }^{+}{K}_{S}^{0}$$, $${\Xi }_{c}^{+}\to {\Xi }^{0}{\pi }^{+}$$, and $${\Xi }_{c}^{+}\to {\Xi }^{0}{K}+$$ at Belle and Belle II Open
View article: Search for lepton-flavor-violating $${\tau }^{-}\to {{\ell}}^{-}{K}_{s}^{0}$$ decays at Belle and Belle II
Search for lepton-flavor-violating $${\tau }^{-}\to {{\ell}}^{-}{K}_{s}^{0}$$ decays at Belle and Belle II Open
A bstract We present the results of a search for charged-lepton-flavor violating decays $${\tau }^{-}\to {{\ell}}^{-}{K}_{s}^{0}$$ , where ℓ − is either an electron or a muon. We combine e + e − data samples recorded by the Belle II experi…
Observation of the decays and Open
View article: Measurement of the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>C</mml:mi><mml:mi>P</mml:mi></mml:math> asymmetry in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>D</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:mo stretchy="false">→</mml:mo><mml:msup><mml:mi>π</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:msup><mml:mi>π</mml:mi><mml:mn>0</mml:mn></mml:msup></mml:math> decays at Belle II
Measurement of the asymmetry in decays at Belle II Open
We measure the CP asymmetry in D+→π+π0 decays reconstructed in e+e− collisions at the Belle II experiment using a dataset corresponding to an integrated luminosity of 428 fb−1. A control sample of D+→π+KS0 decays is used to correct for de…
View article: Test of lepton flavor universality with measurements of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>R</mml:mi><mml:mo stretchy="false">(</mml:mo><mml:msup><mml:mi>D</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:mo stretchy="false">)</mml:mo></mml:math> and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>R</mml:mi><mml:mo stretchy="false">(</mml:mo><mml:msup><mml:mi>D</mml:mi><mml:mrow><mml:mo>*</mml:mo><mml:mo>+</mml:mo></mml:mrow></mml:msup><mml:mo stretchy="false">)</mml:mo></mml:math> using semileptonic <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>B</mml:mi></mml:math> tagging at the Belle II experiment
Test of lepton flavor universality with measurements of and using semileptonic tagging at the Belle II experiment Open
We report measurements of the ratios of branching fractions R(D(*)+)=B(B¯0→D(*)+τ−ν¯τ)/B(B¯0→D(*)+ℓ−ν¯ℓ), where ℓ denotes either an electron or a muon. These ratios test the universality of the charged-current weak interaction. The results…
View article: Measurement of the time-integrated <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mi>C</mml:mi> <mml:mi>P</mml:mi> </mml:math> asymmetry in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:msup> <mml:mi>D</mml:mi> <mml:mn>0</mml:mn> </mml:msup> <mml:mo stretchy="false">→</mml:mo> <mml:msup> <mml:mi>π</mml:mi> <mml:mn>0</mml:mn> </mml:msup> <mml:msup> <mml:mi>π</mml:mi> <mml:mn>0</mml:mn> </mml:msup> </mml:math> decays at Belle II
Measurement of the time-integrated asymmetry in decays at Belle II Open
We measure the time-integrated C P asymmetry, A C P , in D 0 → π 0 π 0 decays reconstructed in e + e − → c c ¯ events collected by Belle II during 2019–2022. The data corresponds to an integrat…
View article: Determination of $|V_{cb}|$ using $B\to D\ellν_\ell$ Decays at Belle II
Determination of $|V_{cb}|$ using $B\to D\ellν_\ell$ Decays at Belle II Open
We present a determination of the Cabibbo-Kobayashi-Maskawa matrix element $|V_{cb}|$ from the decay $B\to D\ellν_\ell$ using a $365~\mathrm{fb}^{-1}$ $e^+e^-\toΥ(4S)\to B\bar B$ data sample recorded by the Belle II experiment at the Super…
View article: New measurement of D0 and D+ meson masses with the KEDR detector
New measurement of D0 and D+ meson masses with the KEDR detector Open
Using the 4.9 pb$^{-1}$ statistics collected at the peak of the $ψ(3770)$ resonance with the KEDR detector at the VEPP-4M electron-positron collider, we measured the masses of the neutral and charged D mesons: $M_{D^0} = 1865.100 \pm 0.210…
View article: Search for a Dark Higgs Boson Produced in Asociation with Inelastic Dark Matter at the Belle II Experiment
Search for a Dark Higgs Boson Produced in Asociation with Inelastic Dark Matter at the Belle II Experiment Open
Inelastic dark matter models that have two dark matter particles and a massive dark photon can reproduce the observed relic dark matter density without violating cosmological limits. The mass splitting between the two dark matter particles…
View article: Measurement of the branching fraction, polarization, and time-dependent <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>C</mml:mi><mml:mi>P</mml:mi></mml:math> asymmetry 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:msup><mml:mi>ρ</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:msup><mml:mi>ρ</mml:mi><mml:mo>−</mml:mo></mml:msup></mml:math> decays and constraint on the CKM angle <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>ϕ</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math>
Measurement of the branching fraction, polarization, and time-dependent asymmetry in decays and constraint on the CKM angle Open
We present a measurement of the branching fraction and fraction of longitudinal polarization of B0→ρ+ρ− decays, which have two π0’s in the final state. We also measure time-dependent CP violation parameters for decays into longitudinally p…
View article: Measurement of branching fractions, <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>C</mml:mi><mml:mi>P</mml:mi></mml:math> asymmetry, and isospin asymmetry for <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>B</mml:mi><mml:mo stretchy="false">→</mml:mo><mml:mi>ρ</mml:mi><mml:mi>γ</mml:mi></mml:math> decays using Belle and Belle II data
Measurement of branching fractions, asymmetry, and isospin asymmetry for decays using Belle and Belle II data Open
We present measurements of B+→ρ+γ and B0→ρ0γ decays using a combined data sample of 772×106 BB¯ pairs collected by the Belle experiment and 387×106 BB¯ pairs collected by the Belle II experiment in e+e− collisions at the ϒ(4S) resonance.…
View article: Search for lepton-flavor-violating $τ^- \to \ell^- K_s^0$ decays at Belle and Belle II
Search for lepton-flavor-violating $τ^- \to \ell^- K_s^0$ decays at Belle and Belle II Open
We present the results of a search for charged-lepton-flavor violating decays $τ^{-} \rightarrow \ell^{-}K_{S}^{0}$, where $\ell^{-}$ is either an electron or a muon. We combine $e^+e^-$ data samples recorded by the Belle II experiment at …
View article: Measurement of the branching fraction and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>C</mml:mi><mml:mi>P</mml:mi></mml:math>-violating asymmetry of the decay <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:msup><mml:mi>π</mml:mi><mml:mn>0</mml:mn></mml:msup><mml:msup><mml:mi>π</mml:mi><mml:mn>0</mml:mn></mml:msup></mml:math> using 387 million <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi mathvariant="normal">ϒ</mml:mi><mml:mo stretchy="false">(</mml:mo><mml:mn>4</mml:mn><mml:mi>S</mml:mi><mml:mo stretchy="false">)</mml:mo></mml:mrow></mml:math> decays in Belle II data
Measurement of the branching fraction and -violating asymmetry of the decay using 387 million decays in Belle II data Open
We measure the branching fraction and CP-violating flavor-dependent rate asymmetry of B0→π0π0 decays reconstructed using the Belle II detector in an electron-positron collision sample containing 387×106 ϒ(4S) mesons. Using an optimized ev…
View article: Measurement of the inclusive branching fractions for $${B}_{s}^{0}$$ decays into D mesons via hadronic tagging
Measurement of the inclusive branching fractions for $${B}_{s}^{0}$$ decays into D mesons via hadronic tagging Open
A bstract We report measurements of the absolute branching fractions $$\mathcal{B}\left({B}_{s}^{0}\to {D}_{s}^{\pm }X\right)$$ , $$\mathcal{B}\left({B}_{s}^{0}\to {D}^{0}/{\overline{D} }^{0}X\right)$$ , and $$\mathcal{B}\left({B}_{s}^{0}\…
View article: Observations of the singly Cabibbo-suppressed decays $$ {\Xi}_c^{+}\to p{K}_S^0 $$, $$ {\Xi}_c^{+}\to \Lambda {\pi}^{+} $$, and $$ {\Xi}_c^{+}\to {\Sigma}^0{\pi}^{+} $$ at Belle and Belle II
Observations of the singly Cabibbo-suppressed decays $$ {\Xi}_c^{+}\to p{K}_S^0 $$, $$ {\Xi}_c^{+}\to \Lambda {\pi}^{+} $$, and $$ {\Xi}_c^{+}\to {\Sigma}^0{\pi}^{+} $$ at Belle and Belle II Open
A bstract Using data samples of 983.0 fb − 1 and 427.9 fb − 1 accumulated with the Belle and Belle II detectors operating at the KEKB and SuperKEKB asymmetric-energy e + e − colliders, singly Cabibbo-suppressed decays $$ {\Xi}_c^{+}\to p{K…
View article: Observation of the decay <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:mn>0</mml:mn></mml:mrow></mml:msup><mml:mo stretchy="false">→</mml:mo><mml:mi>J</mml:mi><mml:mo>/</mml:mo><mml:mi>ψ</mml:mi><mml:mi>ω</mml:mi></mml:mrow></mml:math> at Belle II
Observation of the decay at Belle II Open
We measure the branching fraction of the decay B0→J/ψω using data collected with the Belle II detector at the SuperKEKB collider. The data contain (387±6)×106 BB¯ meson pairs produced in energy-asymmetric e+e− collisions at the ϒ(4S) reso…
View article: Observation of time-dependent <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>C</mml:mi><mml:mi>P</mml:mi></mml:math> violation and measurement of the branching fraction of <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:msup><mml:mi>π</mml:mi><mml:mn>0</mml:mn></mml:msup></mml:math> decays
Observation of time-dependent violation and measurement of the branching fraction of decays Open
We present a measurement of the branching fraction and time-dependent charge-parity (CP) decay-rate asymmetries in B0→J/ψπ0 decays. The data sample was collected with the Belle II detector at the SuperKEKB asymmetric e+e− collider in 2019–…
View article: Observation of time-dependent <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>C</mml:mi><mml:mi>P</mml:mi></mml:math> violation and measurement of the branching fraction of <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:msup><mml:mi>π</mml:mi><mml:mn>0</mml:mn></mml:msup></mml:math> decays
Observation of time-dependent violation and measurement of the branching fraction of decays Open
We present a measurement of the branching fraction and time-dependent charge-parity (CP) decay-rate asymmetries in B0→J/ψπ0 decays. The data sample was collected with the Belle II detector at the SuperKEKB asymmetric e+e− collider in 2019–…