S. Bilokin
A5040533114- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Particle Detector Development and Performance
- Dark Matter and Cosmic Phenomena
- Computational Physics and Python Applications
- Medical Imaging Techniques and Applications
- Radiation Detection and Scintillator Technologies
- Neutrino Physics Research
- Superconducting Materials and Applications
- Particle Accelerators and Free-Electron Lasers
- Atomic and Subatomic Physics Research
- Black Holes and Theoretical Physics
- Scientific Computing and Data Management
- Geophysical Methods and Applications
- NMR spectroscopy and applications
- Muon and positron interactions and applications
- Cold Atom Physics and Bose-Einstein Condensates
- Distributed and Parallel Computing Systems
- Advanced MRI Techniques and Applications
Laboratoire de Physique des 2 Infinis Irène Joliot-Curie
2023
Institut National de Physique Nucléaire et de Physique des Particules
2023
Centre National de la Recherche Scientifique
2017-2023
Ludwig-Maximilians-Universität München
2020-2023
Université Paris-Saclay
2023
Zhejiang University
2023
Institut Pluridisciplinaire Hubert Curien
2018-2020
Université de Strasbourg
2020
GANIL
2015-2019
Université Paris-Sud
2016-2018
We present a search for the direct production of light pseudoscalar decaying into two photons with Belle II detector at SuperKEKB collider. process e^{+}e^{-}→γa, a→γγ in mass range 0.2<m_{a}<9.7 GeV/c^{2} using data corresponding to an integrated luminosity (445±3) pb^{-1}. Light pseudoscalars interacting predominantly standard model gauge bosons (so-called axionlike particles or ALPs) are frequently postulated extensions model. find no evidence ALPs and set 95% confidence level upper...
Abstract We report on new flavor tagging algorithms developed to determine the quark-flavor content of bottom ( "Image missing"<!-- image only, no MathML or LaTex -->) mesons at Belle II. The provide essential inputs for measurements mixing and charge-parity violation. validate evaluate performance using hadronic --> decays with flavor-specific final states reconstructed in a data set corresponding an integrated luminosity 62.8 fb $$^{-1}$$ <mml:math...
We present the first measurement of ratio branching fractions inclusive semileptonic B-meson decays, R(X_{e/μ})=B(B→Xeν)/B(B→Xμν), a precision test electron-muon universality, using data corresponding to 189 fb^{-1} from electron-positron collisions collected with Belle II detector. In events where partner B meson is fully reconstructed, we use fits lepton momentum spectra above 1.3 GeV/c obtain R(X_{e/μ})=1.007±0.009(stat)±0.019(syst), which most precise lepton-universality its kind and...
Top quark production in the process $$e^+e^- \rightarrow t\bar{t}$$ at a future linear electron positron collider with polarised beams is powerful tool to determine indirectly scale of new physics. The presented study, based on detailed simulation ILD detector concept, assumes centre-of-mass energy $$ \sqrt{s} =500$$ GeV and luminosity $$\mathcal {L}=500\, \text{ fb }^{-1} equally shared between incoming beam polarisations \mathcal{P}_{e^-} , \mathcal{P}_{e^+} =\pm 0.8,\mp 0.3$$ . Events are...
Abstract From April to July 2018, a data sample at the peak energy of resonance was collected with Belle II detector SuperKEKB electron-positron collider. This is first experiment. Using Bhabha and digamma events, we measure integrated luminosity be ( , where uncertainty statistical second systematic. work provides basis for future measurements II.
We search for lepton-flavor-violating τ^{-}→e^{-}α and τ^{-}→μ^{-}α decays, where α is an invisible spin-0 boson. The uses electron-positron collisions at 10.58 GeV center-of-mass energy with integrated luminosity of 62.8 fb^{-1}, produced by the SuperKEKB collider collected Belle II detector. excess in lepton-energy spectrum known τ^{-}→e^{-}ν[over ¯]_{e}ν_{τ} τ^{-}→μ^{-}ν[over ¯]_{μ}ν_{τ} decays. report 95% confidence-level upper limits on branching-fraction ratio...
Abstract The CALICE collaboration is developing highly granular electromagnetic and hadronic calorimeters for detectors at future energy frontier electron-positron colliders. After successful tests of a physics prototype, technological prototype the Analog Hadron Calorimeter has been built, based on design construction techniques scalable to collider detector. consists steel absorber structure active layers small scintillator tiles that are individually read out by directly coupled SiPMs....
We measure the tau-to-light-lepton ratio of inclusive <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mi>B</a:mi></a:math>-meson branching fractions <c:math xmlns:c="http://www.w3.org/1998/Math/MathML" display="inline"><c:mrow><c:mrow><c:mi>R</c:mi><c:mo stretchy="false">(</c:mo><c:msub><c:mrow><c:mi>X</c:mi></c:mrow><c:mrow><c:mi>τ</c:mi><c:mo>/</c:mo><c:mo>ℓ</c:mo></c:mrow></c:msub><c:mo stretchy="false">)</c:mo></c:mrow><c:mo>≡</c:mo><c:mspace...
We present GFlaT, a new algorithm that uses graph-neural-network to determine the flavor of neutral <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mi>B</a:mi></a:math> mesons produced in <c:math xmlns:c="http://www.w3.org/1998/Math/MathML" display="inline"><c:mi mathvariant="normal">ϒ</c:mi><c:mo stretchy="false">(</c:mo><c:mn>4</c:mn><c:mi>S</c:mi><c:mo stretchy="false">)</c:mo></c:math> decays. It improves previous algorithms by using information from all charged...
We report measurements of time-dependent <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:mi>C</a:mi><a:mi>P</a:mi></a:mrow></a:math> asymmetries in <c:math xmlns:c="http://www.w3.org/1998/Math/MathML" display="inline"><c:msup><c:mi>B</c:mi><c:mn>0</c:mn></c:msup><c:mo stretchy="false">→</c:mo><c:msubsup><c:mi>K</c:mi><c:mi>S</c:mi><c:mn>0</c:mn></c:msubsup><c:msup><c:mi>π</c:mi><c:mn>0</c:mn></c:msup><c:mi>γ</c:mi></c:math> decays based on a data sample...
We present measurements of <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:msup><a:mrow><a:mi>B</a:mi></a:mrow><a:mrow><a:mo>+</a:mo></a:mrow></a:msup><a:mo stretchy="false">→</a:mo><a:msup><a:mrow><a:mi>ρ</a:mi></a:mrow><a:mrow><a:mo>+</a:mo></a:mrow></a:msup><a:mi>γ</a:mi></a:mrow></a:math> and <d:math xmlns:d="http://www.w3.org/1998/Math/MathML" display="inline"><d:msup><d:mi>B</d:mi><d:mn>0</d:mn></d:msup><d:mo...
Abstract The upgrade of the CMS experiment for high luminosity operation LHC comprises replacement current endcap calorimeter by a granularity sampling (HGCAL). electromagnetic section HGCAL is based on silicon sensors interspersed between lead and copper (or tungsten) absorbers. hadronic uses layers stainless steel as an absorbing medium active in regions radiation exposure, scintillator tiles directly read out photomultipliers remaining regions. As part development detector its readout...
A summary is presented of the workshop "top physics at linear colliders" that was held IFIC Valencia from 30th June to 3rd July 2015. We present an up-to-date status report studies into potential for top quark lepton colliders with energy reach exceeds pair production threshold, a focus on collider projects ILC and CLIC. This shows such can offer very competitive determinations properties (mass, width) its interactions other Standard Model particles, in particular electroweak gauge bosons...
We measure the B0 lifetime and flavor-oscillation frequency using B0→D(*)−π+ decays collected by Belle II experiment in asymmetric-energy e+e− collisions produced SuperKEKB collider operating at Υ(4S) resonance. fit decay-time distribution of signal decays, where initial flavor is determined identifying other B meson event. The results, based on 33000 reconstructed a data sample corresponding to 190 fb−1, are τB0=(1.499±0.013±0.008) ps, Δmd=(0.516±0.008±0.005) ps−1, first uncertainties...
This paper describes an analysis performed at 250 GeV centre of mass energy for the reaction e+e- -> bbbar with International Linear Collider, ILC, assuming integrated luminosity 500 fb-1. measurement requires determining b quark charge, which can be optimally using precise micro-vertex detector ILD and charged kaon identification provided by dE/dx information its TPC. Given that forward backward asymmetry is maximal e-L (Left-handed electron polarisation), it has been necessary to...
A bstract We report a determination of the CKM angle ϕ 3 , also known as γ from combination measurements using samples up to 711 fb − 1 Belle experiment and 362 II experiment. combine results analyses B + → DK Dπ D * K decays, where is an admixture 0 $$ {\overline{D}}^0 <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mover> <mml:mi>D</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> <mml:mn>0</mml:mn> </mml:msup> </mml:math> mesons, in likelihood fit obtain = (75.2 ± 7.6) °...
The high granularity of the CALICE Semi-Digital Hadronic CALorimeter (SDHCAL) provides capability to reveal track segments present in hadronic showers. These are then used as a tool probe behaviour active layers situ, better reconstruct energy these showers and also distinguish them from electromagnetic ones. In addition, comparison data simulation helps discriminate among different shower models simulation. To extract recorded SDHCAL, Hough Transform is after being adapted presence dense...
This paper presents results obtained with the combined CALICE Scintillator Electromagnetic Calorimeter, Analogue Hadronic Calorimeter and Tail Catcher & Muon Tracker, three high granularity scintillator-silicon photomultiplier calorimeter prototypes. The response of system to pions momenta between 4 GeV/c 32 is analysed, including average energy response, resolution, longitudinal shower profiles. Two techniques are applied reconstruct initial particle from measured depositions; a standard...
Top quark production in the process $e^+e^- \to t\bar{t}$ at a future linear electron positron collider with polarised beams is powerful tool to determine indirectly scale of new physics. The presented study, based on detailed simulation ILD detector concept, assumes centre-of-mass energy $\sqrt{s}=500\,$GeV and luminosity $\mathcal{L}=500\,{\rm fb}^{-1}$ equally shared between incoming beam polarisations $\mathcal{P}_{e^-}, \mathcal{P}_{e^+} =\pm0.8,\mp0.3$. Events are selected which top...
Abstract We present the novel implementation of a non-differentiable metric approximation and corresponding loss-scheduling aimed at search for new particles unknown mass in high energy physics experiments. call loss-scheduling, based on minimisation figure-of-merit related function typical particle physics, Punzi-loss function, neural network that utilises this loss Punzi-net. show Punzi-net outperforms standard multivariate analysis techniques generalises well to hypotheses which it was...
We report measurements of the branching fraction and $\it CP$ asymmetry in $B^{0} \to \pi^{0} \pi^{0}$ decays reconstructed at Belle II an electron-positron collision sample containing $198 \times 10^{6}$ $B\overline{B}$ pairs. measure a $\mathcal{B}(\Bpipi) = (1.38 \pm 0.27 0.22) 10^{-6}$ $\Acp(\Bpipi) 0.14 0.46 0.07$, where first uncertainty is statistical second systematic.
We measure the tau-to-light-lepton ratio of inclusive $B$-meson branching fractions $R(X_{\tau/\ell}) \equiv \mathcal{B}(B\to X \tau \nu)/\mathcal{B}(B \to \ell \nu)$, where $\ell$ indicates an electron or muon, and thereby test universality charged-current weak interactions. select events that have one fully reconstructed $B$ meson a charged lepton candidate from $189~\mathrm{fb}^{-1}$ electron-positron collision data collected with Belle II detector. find = 0.228 \pm 0.016~(\mathrm{stat})...
We search for the <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:msup><a:mi>e</a:mi><a:mo>+</a:mo></a:msup><a:msup><a:mi>e</a:mi><a:mo>−</a:mo></a:msup><a:mo stretchy="false">→</a:mo><a:msub><a:mi>η</a:mi><a:mi>b</a:mi></a:msub><a:mo stretchy="false">(</a:mo><a:mn>1</a:mn><a:mi>S</a:mi><a:mo stretchy="false">)</a:mo><a:mi>ω</a:mi></a:math> and <f:math xmlns:f="http://www.w3.org/1998/Math/MathML"...