V. Belavin
A5104608565- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Neutrino Physics Research
- Computational Physics and Python Applications
- Particle Detector Development and Performance
- Dark Matter and Cosmic Phenomena
- Black Holes and Theoretical Physics
- Advanced Data Storage Technologies
- Simulation Techniques and Applications
- Nuclear physics research studies
- Distributed and Parallel Computing Systems
- Medical Imaging Techniques and Applications
- Particle Accelerators and Free-Electron Lasers
- Stochastic processes and statistical mechanics
- Advanced Multi-Objective Optimization Algorithms
- Superconducting Materials and Applications
- International Science and Diplomacy
- Gaussian Processes and Bayesian Inference
- Astrophysics and Cosmic Phenomena
- Atomic and Subatomic Physics Research
- Cosmology and Gravitation Theories
- Machine Learning and Data Classification
- Markov Chains and Monte Carlo Methods
- Model Reduction and Neural Networks
University of Chinese Academy of Sciences
2020-2024
Yandex School of Data Analysis
2019-2023
National Research University Higher School of Economics
2018-2023
European Organization for Nuclear Research
2021-2023
Universidade Federal do Rio de Janeiro
2023
Universitat de Barcelona
2023
Institute of High Energy Physics
2020
Peking University
2020
State Key Laboratory of Nuclear Physics and Technology
2020
Central China Normal University
2020
A narrow pentaquark state, P_{c}(4312)^{+}, decaying to J/ψp, is discovered with a statistical significance of 7.3σ in data sample Λ_{b}^{0}→J/ψpK^{-} decays, which an order magnitude larger than that previously analyzed by the LHCb Collaboration. The P_{c}(4450)^{+} structure formerly reported confirmed and observed consist two overlapping peaks, P_{c}(4440)^{+} P_{c}(4457)^{+}, where this two-peak interpretation 5.4σ. proximity Σ_{c}^{+}D[over ¯]^{0} ¯]^{*0} thresholds peaks suggests they...
Abstract The standard model of particle physics currently provides our best description fundamental particles and their interactions. theory predicts that the different charged leptons, electron, muon tau, have identical electroweak interaction strengths. Previous measurements shown a wide range decays are consistent with this principle lepton universality. This article presents evidence for breaking universality in beauty-quark decays, significance 3.1 deviations, based on proton–proton...
Using proton-proton collision data at centre-of-mass energies of $\sqrt{s} = 7$, $8$ and $13\mathrm{\,TeV}$ recorded by the LHCb experiment Large Hadron Collider, corresponding to an integrated luminosity $9\mathrm{\,fb}^{-1}$, invariant mass spectrum $J/ψ$ pairs is studied. A narrow structure around $6.9\mathrm{\,GeV/}c^2$ matching lineshape a resonance broad just above twice are observed. The deviation from nonresonant $J/ψ$-pair production five standard deviations in region between $6.2$...
Abstract Conventional, hadronic matter consists of baryons and mesons made three quarks a quark–antiquark pair, respectively 1,2 . Here, we report the observation state containing four in Large Hadron Collider beauty experiment. This so-called tetraquark contains two charm quarks, $$\overline{{{{{u}}}}}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mover> <mml:mrow> <mml:mi>u</mml:mi> </mml:mrow> <mml:mo>¯</mml:mo> </mml:mover> </mml:math> $$\overline{{{{{d}}}}}$$...
An angular analysis of the $B^{0}\rightarrow K^{*0}(\to K^{+}\pi^{-})\mu^{+}\mu^{-}$ decay is presented using a data set corresponding to an integrated luminosity 4.7 fb$^{-1}$ $pp$ collision collected with LHCb experiment. The full $C\!P$-averaged observables are determined in bins invariant mass squared dimuon system. Contamination from decays $K^{+}\pi^{-}$ system S-wave configuration taken into account. tension seen between previous results and Standard Model predictions persists new...
Quantum chromodynamics, the theory of strong force, describes interactions coloured quarks and gluons formation hadronic matter. Conventional matter consists baryons mesons made three quark-antiquark pairs, respectively. Particles with an alternative quark content are known as exotic states. Here a study is reported narrow state in D
Searches are performed for both promptlike and long-lived dark photons, A^{'}, produced in proton-proton collisions at a center-of-mass energy of 13 TeV. These searches look A^{'}→μ^{+}μ^{-} decays using data sample corresponding to an integrated luminosity 5.5 fb^{-1} collected with the LHCb detector. Neither search finds evidence signal, 90% confidence-level exclusion limits placed on γ-A^{'} kinetic mixing strength. The A^{'} explores mass region from near dimuon threshold up 70 GeV...
First evidence of a structure in the J/ψΛ invariant mass distribution is obtained from an amplitude analysis Ξb-→J/ψΛK- decays. The observed consistent with being due to charmonium pentaquark strangeness significance 3.1σ including systematic uncertainties and look-elsewhere effect. Its width are determined be 4458.8±2.9-1.1+4.7MeV 17.3±6.5-5.7+8.0MeV, respectively, where quoted statistical systematic. also two resonances. In addition, narrow excited Ξ- states, Ξ1690- Ξ1820-, seen for first...
Results are reported from an amplitude analysis of the $B^+\to D^+D^-K^+$ decay. The is carried out using LHCb proton-proton collision data taken at $\sqrt{s}=7,8,$ and $13$ TeV, corresponding to a total integrated luminosity 9 fb$^{-1}$. In order obtain good description data, it found be necessary include new spin-0 spin-1 resonances in $D^-K^+$ channel with masses around 2.9 GeV$/c^2$, charmonium resonance proximity spin-2 $\chi_{c2}(3930)$ state. widths these determined, as relative...
The first observation of exotic states with a new quark content $c \bar{c} u \bar{s}$ decaying to the $J/\psi K^+$ final state is reported high significance from an amplitude analysis $B^+ \to J/\psi \phi decay. carried out using proton-proton collision data corresponding total integrated luminosity 9 fb$^{-1}$ collected by LHCb experiment at centre-of-mass energies 7, 8 and 13 TeV. most significant state, $Z_{cs}(4000)^+$, has mass $4003\pm6\,^{+\,\phantom{0}4}_{-\,14}$ MeV, width...
The only anticipated resonant contributions to ${B}^{+}\ensuremath{\rightarrow}{D}^{+}{D}^{\ensuremath{-}}{K}^{+}$ decays are charmonium states in the ${D}^{+}{D}^{\ensuremath{-}}$ channel. A model-independent analysis, using LHCb proton-proton collision data taken at center-of-mass energies of $\sqrt{s}=7$, 8, and 13 TeV, corresponding a total integrated luminosity $9\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$, is carried out test this hypothesis. description assuming that resonances...
We present an angular analysis of the $B^{+}\rightarrow K^{\ast+}(\rightarrow K_{S}^{0}\pi^{+})\mu^{+}\mu^{-}$ decay using 9$\,\mbox{fb}^{-1}$ $pp$ collision data collected with LHCb experiment. For first time, full set CP-averaged observables is measured in intervals dimuon invariant mass squared. Local deviations from Standard Model predictions are observed, similar to those previous analyses isospin-partner $B^{0}\rightarrow K^{\ast0}\mu^{+}\mu^{-}$ decay. The global tension dependent on...
The branching fraction of the rare B_{s}^{0}→ϕμ^{+}μ^{-} decay is measured using data collected by LHCb experiment at center-of-mass energies 7, 8, and 13 TeV, corresponding to integrated luminosities 1, 2, 6 fb^{-1}, respectively. reported in intervals q^{2}, square dimuon invariant mass. In q^{2} region between 1.1 6.0 GeV^{2}/c^{4}, measurement found lie 3.6 standard deviations below a model prediction based on combination light cone sum rule lattice QCD calculations. addition, first...
A bstract The W boson mass is measured using proton-proton collision data at $$ \sqrt{s} <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msqrt><mml:mi>s</mml:mi></mml:msqrt></mml:math> = 13 TeV corresponding to an integrated luminosity of 1.7 fb − 1 recorded during 2016 by the LHCb experiment. With a simultaneous fit muon q/p T distribution sample → μν decays and ϕ * Z μμ determined be {m}_w=80354\pm {23}_{\mathrm{stat}}\pm {10}_{\mathrm{exp}}\pm {17}_{\mathrm{theory}}\pm...
An improved measurement of the decay B0s→μ+μ− and searches for decays B0→μ+μ− B0s→μ+μ−γ are performed at LHCb experiment using data collected in proton-proton collisions √s=7, 8 13 TeV, corresponding to integrated luminosities 1, 2 6 fb−1, respectively. The branching fraction effective lifetime measured be B(B0s→μ+μ−)=(3.09+0.46+0.15−0.43−0.11)×10−9 τ(B0s→μ+μ−)=(2.07±0.29±0.03) ps, respectively, where uncertainties include both statistical systematic contributions. No significant signal is...
Branching fraction and effective lifetime measurements of the rare decay $B^0_s\to\mu^+\mu^-$ searches for decays $B^0\to\mu^+\mu^-$ $B^0_s\to\mu^+\mu^-\gamma$ are reported using proton-proton collision data collected with LHCb detector at centre-of-mass energies $7$ TeV, $8$ TeV $13$ corresponding to a luminosity $9$ fb$^{-1}$. The branching ${\mathcal{B}}(B^0_s\to\mu^+\mu^-)=\left(3.09^{+0.46+0.15}_{-0.43-0.11}\right)\times 10^{-9}$ $\tau(B^0_s\to\mu^+\mu^-)=(2.07\pm 0.29\pm 0.03)$...
Tests of lepton universality in B^{0}→K_{S}^{0}ℓ^{+}ℓ^{-} and B^{+}→K^{*+}ℓ^{+}ℓ^{-} decays where ℓ is either an electron or a muon are presented. The differential branching fractions B^{0}→K_{S}^{0}e^{+}e^{-} B^{+}→K^{*+}e^{+}e^{-} measured intervals the dilepton invariant mass squared. measurements performed using proton-proton collision data recorded by LHCb experiment, corresponding to integrated luminosity 9 fb^{-1} . results consistent with standard model previous tests related decay...
An amplitude analysis of B^{-}→J/ψΛp[over ¯] decays is performed using 4400 signal candidates selected on a data sample pp collisions recorded at center-of-mass energies 7, 8, and 13 TeV with the LHCb detector, corresponding to an integrated luminosity 9 fb^{-1}. A narrow resonance in J/ψΛ system, consistent pentaquark candidate strangeness, observed high significance. The mass width this new state are measured be 4338.2±0.7±0.4 MeV 7.0±1.2±1.3 MeV, where first uncertainty statistical second...
A combined amplitude analysis is performed for the decays B^{0}→D[over ¯]^{0}D_{s}^{+}π^{-} and B^{+}→D^{-}D_{s}^{+}π^{+}, which are related by isospin symmetry. The based on data collected LHCb detector in proton-proton collisions at center-of-mass energies of 7, 8, 13 TeV. full sample corresponds to an integrated luminosity 9 fb^{-1}. Two new resonant states with masses 2.908±0.011±0.020 GeV widths 0.136±0.023±0.013 observed, decay D_{s}^{+}π^{+} D_{s}^{+}π^{-} respectively. former state...
A study of the lineshape $\chi_{c1}(3872)$ state is made using a data sample corresponding to an integrated luminosity $3\,$fb$^{-1}$ collected in $pp$ collisions at centre-of-mass energies 7 and 8\,TeV with LHCb detector. Candidate $\psi(2S)$ mesons from b-hadron decays are selected $ J/\psi \pi^+ \pi^-$ decay mode. Describing {\mbox{lineshape}} Breit--Wigner function, mass splitting between states, $\Delta m$, width state, $\Gamma_{\mathrm{BW}}$, determined be \begin{eqnarray*} \Delta m &...
We report four narrow peaks in the Ξ_{b}^{0}K^{-} mass spectrum obtained using pp collisions at center-of-mass energies of 7, 8, and 13 TeV, corresponding to a total integrated luminosity 9 fb^{-1} recorded by LHCb experiment. Referring these states their mass, values are m[Ω_{b}(6316)^{-}]=6315.64±0.31±0.07±0.50 MeV, m[Ω_{b}(6330)^{-}]=6330.30±0.28±0.07±0.50 m[Ω_{b}(6340)^{-}]=6339.71±0.26±0.05±0.50 m[Ω_{b}(6350)^{-}]=6349.88±0.35±0.05±0.50 where uncertainties statistical, systematic, last...
A bstract The decays B + → J / ψπ π − K are studied using a data set corresponding to an integrated luminosity of 9 fb 1 collected with the LHCb detector in proton-proton collisions between 2011 and 2018. Precise measurements ratios branching fractions intermediate ψ 2 (3823), χ c1 (3872) ψ(2S) states reported. values $$ {\displaystyle \begin{array}{c}\frac{{\mathcal{B}}_{{\mathrm{B}}^{+}\to {\uppsi}_2(3823){\mathrm{K}}^{+}}\times {\mathcal{B}}_{\uppsi_2(3823)\to \mathrm{J}/{\uppsi...
An amplitude analysis of flavor-untagged B_{s}^{0}→J/ψpp[over ¯] decays is performed using a sample 797±31 reconstructed with the LHCb detector. The data, collected in proton-proton collisions between 2011 and 2018, correspond to an integrated luminosity 9 fb^{-1}. Evidence for new structure J/ψp J/ψp[over systems mass 4337_{-4}^{+7} _{-2}^{+2} MeV width 29_{-12}^{+26} _{-14}^{+14} found, where first uncertainty statistical second systematic, significance range 3.1 3.7σ, depending on...
The ratio of the B0s and B0 fragmentation fractions, fs/fd, in proton-proton collisions at LHC, is obtained as a function B-meson transverse momentum collision center-of-mass energy from combined analysis different B-decay channels measured by LHCb experiment. results are described linear meson or with inspired Tsallis statistics. Precise measurements branching fractions B0s→J/ψϕ B0s→D−sπ+ decays performed, reducing their uncertainty about factor 2 respect to previous world averages....
The first observation of the semileptonic b-baryon decay Λ_{b}^{0}→Λ_{c}^{+}τ^{-}ν[over ¯]_{τ}, with a significance 6.1σ, is reported using data sample corresponding to 3 fb^{-1} integrated luminosity, collected by LHCb experiment at center-of-mass energies 7 and 8 TeV LHC. τ^{-} lepton reconstructed in hadronic three charged pions. ratio K=B(Λ_{b}^{0}→Λ_{c}^{+}τ^{-}ν[over ¯]_{τ})/B(Λ_{b}^{0}→Λ_{c}^{+}π^{-}π^{+}π^{-}) measured be 2.46±0.27±0.40, where uncertainty statistical second...