ORCID Profile
0000-0001-5279-4787
Current Organisations
Soochow University
,
P.N. Lebedev Physical Institute of the Russian Academy of Sciences
,
National Research University Higher School of Economics
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Publisher: American Physical Society (APS)
Date: 25-10-2023
Publisher: American Physical Society (APS)
Date: 28-04-2023
Publisher: Springer Science and Business Media LLC
Date: 03-2022
Abstract: We present the first measurement of the branching fraction of the singly Cabibbo-suppressed (SCS) decay $$ {\\Lambda}_c^{+} $$ Λ c + → pη ′ with η ′ → ηπ + π − , using a data s le corresponding to an integrated luminosity of 981 fb − 1 , collected by the Belle detector at the KEKB e + e − asymmetric-energy collider. A significant $$ {\\Lambda}_c^{+} $$ Λ c + → pη ′ signal is observed for the first time with a signal significance of 5.4 σ . The relative branching fraction with respect to the normalization mode $$ {\\Lambda}_c^{+} $$ Λ c + → pK − π + is measured to be $$ \\frac{\\mathcal{B}\\left({\\Lambda}_c^{+}\\to p\\eta^{\\prime}\\right)}{\\mathcal{B}\\left({\\Lambda}_c^{+}\\to {pK}^{-}{\\pi}^{+}\\right)}=\\left(7.54\\pm 1.32\\pm 0.73\\right)\\times {10}^{-3}, $$ B Λ c + → pη ′ B Λ c + → pK − π + = 7.54 ± 1.32 ± 0.73 × 10 − 3 , where the uncertainties are statistical and systematic, respectively. Using the world-average value of $$ \\mathcal{B}\\left({\\Lambda}_c^{+}\\to {pK}^{-}{\\pi}^{+}\\right) $$ B Λ c + → pK − π + = (6 . 28 ± 0 . 32) × 10 − 2 , we obtain $$ \\mathcal{B}\\left({\\Lambda}_c^{+}\\to p\\eta^{\\prime}\\right)=\\left(4.73\\pm 0.82\\pm 0.46\\pm 0.24\\right)\\times {10}^{-4}, $$ B Λ c + → pη ′ = 4.73 ± 0.82 ± 0.46 ± 0.24 × 10 − 4 , where the uncertainties are statistical, systematic, and from $$ \\mathcal{B}\\left({\\Lambda}_c^{+}\\to {pK}^{-}{\\pi}^{+}\\right) $$ B Λ c + → pK − π + , respectively.
Publisher: Springer Science and Business Media LLC
Date: 23-03-2023
Abstract: We present the analysis of two-particle angular correlations using coordinate systems defined with the conventional beam axis and the event thrust axis. We propose the latter as a good representation for the correlation structure interpretation in the e + e − collision system. The e + e − collisions to hadronic final states at center-of-mass energies of $$ \\sqrt{s} $$ s = 10 . 52 GeV and 10.58 GeV are recorded by the Belle detector at KEKB. In this paper, results on the first dataset are supplementary to the previous Belle publication [1]. At the same time, the latter is the first two-particle correlation measurement at collision energy on the Υ (4 S ) resonance and is sensitive to its decay products. Measurements are reported as a function of the charged-particle multiplicity. Finally, a qualitative understanding of the correlation structure is discussed using a combination of Monte Carlo simulations and experimental data.
Publisher: American Physical Society (APS)
Date: 02-05-2023
Publisher: American Physical Society (APS)
Date: 22-02-2023
Publisher: American Physical Society (APS)
Date: 16-02-2023
Publisher: American Physical Society (APS)
Date: 20-01-2023
Publisher: American Physical Society (APS)
Date: 21-02-2023
Publisher: American Physical Society (APS)
Date: 31-10-2023
Publisher: American Physical Society (APS)
Date: 19-11-2021
Publisher: American Physical Society (APS)
Date: 28-06-2023
Publisher: American Physical Society (APS)
Date: 09-03-2023
Publisher: American Physical Society (APS)
Date: 08-02-2023
Publisher: American Physical Society (APS)
Date: 17-10-2023
Publisher: American Physical Society (APS)
Date: 07-03-2023
Publisher: Elsevier BV
Date: 03-2023
Publisher: American Physical Society (APS)
Date: 08-05-2023
Publisher: American Physical Society (APS)
Date: 12-04-2023
Publisher: American Physical Society (APS)
Date: 07-06-2023
Publisher: Springer Science and Business Media LLC
Date: 21-09-2023
Publisher: American Physical Society (APS)
Date: 17-02-2023
Publisher: American Physical Society (APS)
Date: 16-02-2023
Publisher: Springer Science and Business Media LLC
Date: 12-01-2023
Abstract: Using a data s le 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 $$ {\\Omega}_c^0\\to {\\Xi}^{-}{\\pi}^{+} $$ Ω c 0 → Ξ − π + and Ω − K + and the doubly Cabibbo-suppressed decay $$ {\\Omega}_c^0\\to {\\Xi}^{-}{K}^{+} $$ Ω c 0 → Ξ − K + . Evidence for an $$ {\\Omega}_c^0 $$ Ω c 0 signal in the $$ {\\Omega}_c^0 $$ Ω c 0 → Ξ − π + mode is reported with a significance of 4 . 5 σ including systematic uncertainties. The ratio of branching fractions to the normalization mode $$ {\\Omega}_c^0 $$ Ω c 0 → Ω − π + is measured to be $$ \\mathcal{B}\\left({\\Omega}_c^0\\to {\\Xi}^{-}{\\pi}^{+}\\right)/\\mathcal{B}\\left({\\Omega}_c^0\\to {\\Omega}^{-}{\\pi}^{+}\\right)=0.253\\pm 0.052\\left(\\textrm{stat}.\\right)\\pm 0.030\\left(\\textrm{syst}.\\right). $$ B Ω c 0 → Ξ − π + / B Ω c 0 → Ω − π + = 0.253 ± 0.052 stat . ± 0.030 syst . . No significant signals of $$ {\\Omega}_c^0\\to {\\Xi}^{-}{K}^{+} $$ Ω c 0 → Ξ − K + and Ω − K + modes are found. The upper limits at 90% confidence level on ratios of branching fractions are determined to be $$ \\mathcal{B}\\left({\\Omega}_c^0\\to {\\Xi}^{-}{K}^{+}\\right)/\\mathcal{B}\\left({\\Omega}_c^0\\to {\\Omega}^{-}{\\pi}^{+}\\right) .070 $$ B Ω c 0 → Ξ − K + / B Ω c 0 → Ω − π + 0.070 and $$ \\mathcal{B}\\left({\\Omega}_c^0\\to {\\Omega}^{-}{K}^{+}\\right)/\\mathcal{B}\\left({\\Omega}_c^0\\to {\\Omega}^{-}{\\pi}^{+}\\right) .29. $$ B Ω c 0 → Ω − K + / B Ω c 0 → Ω − π + 0.29 .
Publisher: American Physical Society (APS)
Date: 28-03-2023
Publisher: Springer Science and Business Media LLC
Date: 02-2022
Abstract: We present a measurement of the Cabibbo-Kobayashi-Maskawa unitarity triangle angle ϕ 3 (also known as γ ) using a model-independent Dalitz plot analysis of B + → D ( $$ {K}_S^0 $$ K S 0 h + h − ) h + , where D is either a D 0 or $$ \\overline{D} $$ D ¯ 0 meson and h is either a π or K . This is the first measurement that simultaneously uses Belle and Belle II data, combining s les corresponding to integrated luminosities of 711 fb − 1 and 128 fb − 1 , respectively. All data were accumulated from energy-asymmetric e + e − collisions at a centre-of-mass energy corresponding to the mass of the Υ(4 S ) resonance. We measure ϕ 3 = (78 . 4 ± 11 . 4 ± 0 . 5 ± 1 . 0)°, where the first uncertainty is statistical, the second is the experimental systematic uncertainty and the third is from the uncertainties on external measurements of the D -decay strong-phase parameters.
Publisher: American Physical Society (APS)
Date: 08-08-2023
Publisher: American Physical Society (APS)
Date: 05-04-2023
Publisher: American Physical Society (APS)
Date: 28-06-2023
Publisher: American Physical Society (APS)
Date: 04-03-2022
Publisher: American Physical Society (APS)
Date: 11-07-2023
Publisher: American Physical Society (APS)
Date: 21-09-2023
Publisher: American Physical Society (APS)
Date: 03-03-2023
Publisher: American Physical Society (APS)
Date: 23-02-2022
Publisher: Springer Science and Business Media LLC
Date: 04-2022
DOI: 10.1140/EPJC/S10052-022-10180-9
Abstract: We report on new flavor tagging algorithms developed to determine the quark-flavor content of bottom ( "Image missing" ) mesons at Belle II. The algorithms provide essential inputs for measurements of quark-flavor mixing and charge-parity violation. We validate and evaluate the performance of the algorithms using hadronic "Image missing" decays with flavor-specific final states reconstructed in a data set corresponding to an integrated luminosity of 62.8 fb $$^{-1}$$ - 1 , collected at the "Equation missing" resonance with the Belle II detector at the SuperKEKB collider. We measure the total effective tagging efficiency to be $$\begin{aligned} \varepsilon _\mathrm{eff} = \big (30.0 \pm 1.2(\text {stat}) \pm 0.4(\text {syst})\big )\% \end{aligned}$$ ε eff = ( 30.0 ± 1.2 ( stat ) ± 0.4 ( syst ) ) % for a category-based algorithm and $$\begin{aligned} \varepsilon _\mathrm{eff} = \big (28.8 \pm 1.2(\text {stat}) \pm 0.4(\text {syst})\big )\% \end{aligned}$$ ε eff = ( 28.8 ± 1.2 ( stat ) ± 0.4 ( syst ) ) % for a deep-learning-based algorithm.
Publisher: American Physical Society (APS)
Date: 15-05-2023
Publisher: Springer Science and Business Media LLC
Date: 21-06-2023
Abstract: 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 ( V 0 = ρ 0 , ϕ , ω , K *0 , or $$ \\overline{K} $$ K ¯ *0 ) using 980 fb − 1 of data collected with the Belle detector at the KEKB collider. No significant excess of such signal events is observed, and thus 90% credibility level upper limits are set on the τ → ℓV 0 branching fractions in the range of (1.7–4 . 3) × 10 − 8 . These limits are improved by 30% on average from the previous results.
Publisher: Springer Science and Business Media LLC
Date: 16-05-2022
Abstract: We present a search for the charged lepton-flavor-violating decays ϒ(1 S ) → ℓ ± ℓ ′ ∓ and radiative charged lepton-flavour-violating decays ϒ(1 S ) → γ ℓ ± ℓ ′ ∓ [ ℓ , ℓ ′ = e, μ, τ ] using the 158 million ϒ(2 S ) s le collected by the Belle detector at the KEKB collider. This search uses ϒ(1 S ) mesons produced in ϒ(2 S ) → π + π − ϒ(1 S ) transitions. We do not find any significant signal, so we provide upper limits on the branching fractions at the 90% confidence level.
Publisher: American Physical Society (APS)
Date: 28-06-2023
Publisher: American Physical Society (APS)
Date: 29-06-2023
Publisher: American Physical Society (APS)
Date: 11-01-2022
Publisher: American Physical Society (APS)
Date: 30-12-2021
Publisher: American Physical Society (APS)
Date: 27-01-2023
Publisher: American Physical Society (APS)
Date: 25-07-2022
Publisher: American Physical Society (APS)
Date: 24-01-2023
Publisher: Springer Science and Business Media LLC
Date: 21-08-2023
Abstract: We report the first measurement of the inclusive e + e − → $$ b\\overline{b} $$ b b ¯ → $$ {D}_s^{\\pm } $$ D s ± X and e + e − → $$ b\\overline{b} $$ b b ¯ → D 0 / $$ {\\overline{D}}^0 $$ D ¯ 0 X cross sections in the energy range from 10 . 63 to 11 . 02 GeV. Based on these results, we determine σ ( e + e − → $$ {B}_s^0{\\overline{B}}_s^0 $$ B s 0 B ¯ s 0 X ) and σ ( e + e − → $$ B\\overline{B} $$ B B ¯ X ) in the same energy range. We measure the fraction of $$ {B}_s^0 $$ B s 0 events at Υ(10860) to be f s = ( $$ {22.0}_{-2.1}^{+2.0} $$ 22.0 − 2.1 + 2.0 )%. We determine also the ratio of the $$ {B}_s^0 $$ B s 0 inclusive branching fractions $$ \\mathcal{B} $$ B ( $$ {B}_s^0 $$ B s 0 → D 0 / $$ {\\overline{D}}^0 $$ D ¯ 0 X ) / $$ \\mathcal{B} $$ B ( $$ {B}_s^0 $$ B s 0 → $$ {D}_s^{\\pm } $$ D s ± X ) = 0 . 416 ± 0 . 018 ± 0 . 092. The results are obtained using the data collected with the Belle detector at the KEKB asymmetric-energy e + e − collider.
Publisher: American Physical Society (APS)
Date: 11-07-2023
Publisher: American Physical Society (APS)
Date: 11-07-2023
Publisher: American Physical Society (APS)
Date: 07-07-2023
Publisher: Springer Science and Business Media LLC
Date: 30-01-2023
Abstract: We report the measurement of the two-photon decay width of χ c 2 (1 P ) in two-photon processes at the Belle experiment. We analyze the process γγ → χ c 2 (1 P ) → J/ψγ , J/ψ → ℓ + ℓ − ( ℓ = e or μ ) using a data s le of 971 fb − 1 collected with the Belle detector at the KEKB e + e − collider. In this analysis, the product of the two-photon decay width of χ c 2 (1 P ) and the branching fraction is determined to be $$ {\\Gamma}_{\\gamma \\gamma}\\left({\\chi}_{c2}(1P)\\right)\\mathcal{B}\\left({\\chi}_{c2}(1P)\\to J/\\psi \\gamma \\right)\\mathcal{B}\\left(J/\\psi \\to {\\ell}^{+}{\\ell}^{-}\\right)=14.8\\pm 0.3\\left(\\textrm{stat}.\\right)\\pm 0.7\\left(\\textrm{syst}.\\right) $$ Γ γγ χ c 2 1 P B χ c 2 1 P → J / ψγ B J / ψ → ℓ + ℓ − = 14.8 ± 0.3 stat . ± 0.7 syst . eV, which corresponds to Γ γγ ( χ c 2 (1 P )) = 653 ± 13(stat.) ± 31(syst.) ± 17(B.R.) eV, where the third uncertainty is from $$ \\mathcal{B} $$ B ( χ c 2 (1 P ) → J/ψγ ) and $$ \\mathcal{B} $$ B ( J/ψ → ℓ + ℓ − ).
Publisher: American Physical Society (APS)
Date: 15-02-2023
Publisher: American Physical Society (APS)
Date: 02-08-2023
Publisher: American Physical Society (APS)
Date: 08-02-2022
Publisher: American Physical Society (APS)
Date: 14-02-2023
Publisher: American Physical Society (APS)
Date: 15-02-2023
Publisher: American Physical Society (APS)
Date: 08-04-2022
Publisher: American Physical Society (APS)
Date: 06-01-2022
Publisher: American Physical Society (APS)
Date: 16-08-2023
Publisher: American Physical Society (APS)
Date: 22-09-2022
Publisher: American Physical Society (APS)
Date: 21-02-2023
Publisher: American Physical Society (APS)
Date: 14-09-2023
Publisher: Springer Science and Business Media LLC
Date: 18-08-2023
Abstract: We measure the cross section of e + e − → η c J/ψ at the Υ( nS )( n = 1–5) on-resonance and 10.52 GeV off-resonance energy points using the full data s le collected by the Belle detector with an integrated luminosity of 955 fb − 1 . We also search for double charmonium production in e + e − → η c J/ψ via initial state radiation near the η c J/ψ threshold. No evident signal of the double charmonium state is found, but evidence for the e + e − → η c J/ψ process is found with a statistical significance greater than 3 . 3 σ near the η c J/ψ threshold. The average cross section near the threshold is measured and upper limits of cross sections are set for other regions.
Publisher: American Physical Society (APS)
Date: 19-10-2021
Publisher: American Physical Society (APS)
Date: 07-02-2023
Publisher: American Physical Society (APS)
Date: 16-05-2022
Publisher: American Physical Society (APS)
Date: 22-09-2023
Location: Russian Federation
Location: Russian Federation
Location: Russian Federation
Location: No location found
Location: No location found
Location: No location found
No related grants have been discovered for Denis Bodrov.