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Бочарников Владимир Олегович

Факультет компьютерных наук

Профиль на hse.ru ↗ тел.: 27266
Публикаций
100
Языков
1
Наград
3
Конференций
0
Профиль Публикации (100) Курсы (3)

Профессиональные интересы

машинное обучение

Должности

  • Младший научный сотрудник — Факультет компьютерных наук, Институт искусственного интеллекта и цифровых наук, Научно-учебная лаборатория методов анализа больших данных
  • Преподаватель — Факультет физики

Био

  • · Начал работать в НИУ ВШЭ в 2023 году.
  • · Научно-педагогический стаж: 3 года.

Образование

  • 2021 · Аспирантура: Национальный исследовательский ядерный университет "МИФИ", специальность «Физика и астрономия»
  • 2017 · Магистратура: Национальный исследовательский ядерный университет "МИФИ", специальность «Ядерные физика и технологии», квалификация «Магистр»
  • 2015 · Бакалавриат: Национальный исследовательский ядерный университет "МИФИ", специальность «Ядерные физика и технологии», квалификация «Бакалавр»

Опыт работы

  • · 2017-2020: : ФИАН, лаборатория тяжелых кварков и лептонов — инженер
  • · 2018-2022: : Deutsches Elektronen-Synchrotron (DESY), группа FTX, Гамбург, Германия — научный сотрудник

Награды и поощрения

  • · Благодарность старшего директора по научным исследованиям и разработкам НИУ ВШЭ (август 2024)
  • · Надбавка за публикацию в журнале из Списка А (и приравненном к нему научном издании) (2025–2026, 2024–2025)
  • · Группа высокого профессионального потенциала (кадровый резерв НИУ ВШЭ)Категория "Новые исследователи" (2024–2025)

Гранты и проекты

  • — · Факультет компьютерных наук НИУ ВШЭ, Сколтех и Физический институт им. П. Н. Лебедева РАН провели Московскую международную школу физики 2024

Идентификаторы исследователя

Публикации (100)

The Highly-Granular time-of-flight Neutron Detector for the BM@N experiment

2025 · ARTICLE · en

A new Highly-Granular time-of-flight Neutron Detector (HGND) is being developed and constructed to measure azimuthal neutron flow and neutron yields in nucleus–nucleus interactions in heavy-ion collisions with energies up to 4A GeV in the fixed target experiment BM@N at JINR. Details of the detector design and results of performance studies for neutron identification and reconstruction are shown. Comparison of simulations for different options of the HGND layout at the BM@N is presented. Several proposed methods of neutron reconstruction including machine learning and cluster methods are discussed.

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Unsupervised Learning for Calorimeter Response Correction: A WGAN-Based Method

2025 · CHAPTER · en

The long-term stability of calorimeters is crucial in high-energy physics experiments, where precise energy measurements are essential for accurate particle reconstruction. This study introduces a Wasserstein GAN (WGAN)-based machine learning approach for calibrating calorimeter responses affected by aging and other systematic shifts. Our methodology is applied to realistic, high-granularity calorimeter data that more accurately mimic physical detector conditions. The dataset reflects energy deposition across all calorimeter cells, following an exponential energy spectrum and eliminating artificial peaks in the distribution. By leveraging Wasserstein distance minimization, our model estimates aging coefficients of cells, realigning degraded detector responses with their undamaged counterparts. The results highlight the potential of a data-driven approach for calorimeter calibration, demonstrating correcting energy measurement discrepancies with a reduced number of required events, making it a valuable tool for future detector calibration strategies.

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Production of protons, deuterons and tritons in argon-nucleus interactions at 3.2 A GeV

2025 · ARTICLE · en

Results of the BM@N experiment at the Nuclotron/NICA complex on the production of protons, deuterons and tritons in interactions of an argon beam of 3.2 A GeV with fixed targets of C, Al, Cu, Sn and Pb are presented. Transverse mass spectra, rapidity distributions and multiplicities of protons, deuterons and tritons are measured. The results are treated within a coalescence approach and compared with predictions of theoretical models and with other measurements.

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Branching fraction measurement of the decay 𝐵+ →𝜓⁡(2⁢𝑆)⁢𝜙⁡(1020)⁢𝐾+

2025 · ARTICLE · en

The branching fraction of the decay 𝐵+ →𝜓⁡(2⁢𝑆)⁢𝜙⁡(1020)⁢𝐾+, relative to the topologically similar decay 𝐵+ →𝐽/𝜓⁢𝜙⁡(1020)⁢𝐾+, is measured using proton-proton collision data collected by the LHCb experiment at center-of-mass energies of 7, 8, and 13 TeV, corresponding to an integrated luminosity of 9 fb−1. The ratio is found to be 0.061 ±0.004 ±0.009, where the first uncertainty is statistical and the second systematic. Using the world-average branching fraction for 𝐵+ →𝐽/𝜓⁢𝜙⁡(1020)⁢𝐾+, the branching fraction for the decay 𝐵+ →𝜓⁡(2⁢𝑆)⁢𝜙⁡(1020)⁢𝐾+ is found to be (3.0 ±0.2 ±0.5 ±0.2) ×10−6, where the first uncertainty is statistical, the second systematic, and the third is due to the branching fraction of the normalization channel.

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Angular analysis of B0 → K*0e+e− decays

2025 · ARTICLE · en

An angular analysis of B0 → K*0e+e− decays is presented using proton-proton collision data collected by the LHCb experiment at centre-of-mass energies of 7, 8 and 13 TeV, corresponding to an integrated luminosity of 9 fb−1. The analysis is performed in the region of the dilepton invariant mass squared of 1.1–6.0 GeV2/c4. In addition, a test of lepton flavour universality is performed by comparing the obtained angular observables with those measured in B0 → K*0μ+μ− decays. In general, the angular observables are found to be consistent with the Standard Model expectations as well as with global analyses of other b → sℓ+ℓ− processes, where ℓ is either a muon or an electron. No sign of lepton-flavour-violating effects is observed.

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Search for resonance-enhanced 𝐶⁢𝑃 and angular asymmetries in the Λ+𝑐 →𝑝⁢𝜇+⁢𝜇− decay at LHCb

2025 · ARTICLE · en

The first measurement of the 𝐶⁢𝑃 asymmetry of the decay rate (𝐴𝐶⁢𝑃) and the 𝐶⁢𝑃 average (Σ⁢𝐴FB) and 𝐶⁢𝑃 asymmetry (Δ⁢𝐴FB) of the forward-backward asymmetry in the muon system of Λ+𝑐 →𝑝⁢𝜇+⁢𝜇− decays is reported. The measurement is performed using a data sample of proton-proton collisions, recorded by the LHCb experiment from 2016 to 2018 at a center-of-mass energy of 13 TeV, which corresponds to an integrated luminosity of 5.4 fb−1. The asymmetries are measured in two regions of dimuon mass near the 𝜙-meson mass peak. The dimuon-mass integrated results are 𝐴𝐶⁢𝑃 =(−1.1 ±4.0 ±0.5)%, Σ⁢𝐴FB =(3.9 ±4.0 ±0.6)%, Δ⁢𝐴FB =(3.1 ±4.0 ±0.4)%, where the first uncertainty is statistical and the second systematic. The results are consistent with the conservation of 𝐶⁢𝑃 symmetry and the Standard Model expectations.

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Evidence for 𝐵− →𝐷**0⁢𝜏−⁢𝜈_𝜏 Decays

2025 · ARTICLE · en

The first evidence for the decay 𝐵−→𝐷**0⁢𝜏−⁢‾𝜈𝜏 is obtained using proton-proton collision data collected by the LHCb experiment, corresponding to an integrated luminosity of 9 fb−1, at centre-of-mass energies of 7, 8, and 13 TeV. Here, the 𝐷**0 meson represents any of the three excited charm mesons 𝐷1⁢(2420)0, 𝐷*2⁢(2460)0, and 𝐷′1⁢(2400)0. The 𝐵− →𝐷**0⁢𝜏−⁢¯𝜈𝜏 signal is measured with a significance of 3.5⁢𝜎, including systematic uncertainties. The combined branching fraction ℬ⁡(𝐵−→𝐷**01,2⁢𝜏−⁢¯𝜈𝜏)×ℬ⁡(𝐷**01,2→𝐷*+⁢𝜋−), where 𝐷**01,2 denotes both 𝐷1⁢(2420)0 and 𝐷*2⁢(2460)0 contributions, is measured to be [0.051±0.013⁢(stat)±0.006⁢(syst)±0.009⁢(ext)]%, where the last uncertainty reflects that of the branching fraction of the normalization channel 𝐵− →𝐷**01,2⁢𝐷−𝑠(*). The ratio between the tauonic and muonic semileptonic 𝐵 decays, with the latter taken from world average values, is also determined and found to be ℛ⁡(𝐷**01,2)=0.13±0.03⁢(stat)±0.01⁢(syst)±0.02⁢(ext).

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Observation of the Λ0b → J/ψΞ−K + and Ξ0b → J/ψΞ−π+ decays

2025 · ARTICLE · en

The first observation of the Ξ0b→J/ψΞ−π+ decay and the most precise measurement of the branching fraction of the Λ0b→J/ψΞ−K+ decay are reported, using proton-proton collision data from the LHCb experiment collected in 2016--2018 at a centre-of-mass energy of 13~TeV, corresponding to an integrated luminosity of 5.4~fb−1. Using the Λ0b→J/ψΛ and Ξ0b→J/ψΞ− decays as normalisation channels, the ratios of branching fractions are measured to be: B(Λ0b→J/ψΞ−K+)B(Λ0b→J/ψΛ)=(1.17±0.14±0.08)×10−2, B(Ξ0b→J/ψΞ−π+)B(Ξ0b→J/ψΞ−)=(11.9±1.4±0.6)×10−2, where the first uncertainty is statistical and the second systematic.

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Measurement of the multiplicity dependence of Υ production ratios in pp collisions at sqrt(s) = 13 TeV

2025 · ARTICLE · en

The Υ(2S) and Υ(3S) production cross-sections are measured relative to that of the Υ(1S) meson, as a function of charged-particle multiplicity in proton-proton collisions at a centre-of-mass energy of 13 TeV. The measurement uses data collected by the LHCb experiment in 2018 corresponding to an integrated luminosity of 2 fb−1. Both the Υ(2S)-to-Υ(1S) and Υ(3S)-to-Υ(1S) cross-section ratios are found to decrease significantly as a function of event multiplicity, with the Υ(3S)-to-Υ(1S) ratio showing a steeper decline towards high multiplicity. This hierarchy is qualitatively consistent with the comover model predictions, indicating that final-state interactions play an important role in bottomonia production in high-multiplicity events.

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Search for charge-parity violation in semileptonically tagged D0 → K+π− decays

2025 · ARTICLE · en

An analysis of the flavour oscillations of the charmed neutral meson is presented. The ratio of D0 → K+π− and D0 → K−π+ decay rates is measured as a function of the decay time of the D0 meson and compared with the charge-conjugated system to search for charge-parity violation. The meson flavour at production is double-tagged by the charges of the muon and pion in the preceding and D∗(2010)+ → D0π+ decays, respectively. These decays are selected from proton-proton collision data collected by the LHCb experiment at a centre-of-mass energy of 13 TeV and corresponding to an integrated luminosity of 5.4 fb−1. The flavour oscillation parameters, relating to the differences in mass and width of the mass eigenstates, are found to be y′ = (5.8 ± 1.6) × 10−3 and (x′)2 = (0.0 ± 1.2) × 10−4. No evidence for charge-parity violation is seen either in the flavour oscillations or in the decay, where the direct charge-parity asymmetry is measured to be AD = (2.3 ± 1.7) %.

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Курсы (3)