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Болдырев Алексей Сергеевич

Факультет компьютерных наук

Профиль на hse.ru ↗ тел.: 27266
Публикаций
26
Языков
3
Наград
5
Конференций
3
Профиль Публикации (274) Курсы (12)

Профессиональные интересы

Физика высоких энергийМашинное обучение и анализ данных

Должности

  • Научный сотрудник — Факультет компьютерных наук, Институт искусственного интеллекта и цифровых наук, Научно-учебная лаборатория методов анализа больших данных
  • Доцент — Факультет компьютерных наук, Департамент больших данных и информационного поиска
  • Приглашенный преподаватель — НИУ ВШЭ в Нижнем Новгороде, Факультет менеджмента, Департамент маркетинга и предпринимательства

Био

  • · Начал работать в НИУ ВШЭ в 2018 году.
  • · Научно-педагогический стаж: 13 лет.

Образование

  • 2013 · Кандидат физико-математических наук
  • 2010 · Специалитет: Московский государственный университет им. М.В. Ломоносова, специальность «Физика атомного ядра и частиц», квалификация «Физик»

Опыт работы

  • · 2020: Научный сотрудник Научно-учебной лаборатории методов анализа больших данных НИУ ВШЭ ( настоящее время)
  • · 2020: Доцент Департамента больших данных и информационного поиска ( настоящее время) Постдок НИУ ВШЭ (2018–2020) Старший научный сотрудник Института ядерной физики им. Д.В. Скобельцына, МГУ им. М.В. Ломоносова (2017–2018)
  • · Младший научный сотрудник Физического института им. П.Н. Лебедева РАН (2006-2017) Научный сотрудник Института ядерной физики им. Д.В. Скобельцына МГУ им. М.В. Ломоносова (2016) Стипендия TRIL, Международный центр теоретической физики Абдуса Салама (ICTP) (2015–2016) Научный сотрудник Института ядерной физики им. Д.В. Скобельцына МГУ им. М.В. Ломоносова (2014–2015)

Награды и поощрения

  • · Благодарность НИУ ВШЭ (май 2024)
  • · Благодарственное письмо проректора НИУ ВШЭ (сентябрь 2022)
  • · Надбавка за публикацию в журнале из Списка А (и приравненном к нему научном издании) (2023–2024)
  • · Надбавка за публикацию в международном рецензируемом научном издании (2022–2023, 2021–2022, 2020–2022)
  • · Надбавка за регулярные публикации в международных рецензируемых научных изданиях (2024–2029)

Гранты и проекты

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

Конференции (3)

Показать все
  • · 2022: Second MODE Workshop on Differentiable Programming for Experiment Design (Колумбари, Крит). Доклад: LHCb ECAL optimization
  • · 2021: First MODE Workshop on Differentiable Programming (Лувэн-ла-Нёв). Доклад: Optimization of LHCb calorimeter
  • · 2020: Instrumentation for Colliding Beam Physics (Новосибирск). Доклад: ML-assisted versatile approach to Calorimeter R&D

Идентификаторы исследователя

Публикации (274)

Measurement of 𝐶⁢𝑃 Violation in 𝐵0→𝜓⁡(→ℓ+⁢ℓ−)⁢𝐾0𝑆⁡(→𝜋+⁢𝜋−) Decays

2024 · ARTICLE · en

A measurement of time-dependent 𝐶⁢𝑃 violation in the decays of 𝐵0 and ¯𝐵0 mesons to the final states 𝐽/𝜓⁢(→𝜇+⁢𝜇−)⁢𝐾0𝑆, 𝜓⁡(2⁢𝑆)⁢(→𝜇+⁢𝜇−)⁢𝐾0𝑆 and 𝐽/𝜓⁢(→𝑒+⁢𝑒−)⁢𝐾0𝑆 with 𝐾0𝑆→𝜋+⁢𝜋− is presented. The data correspond to an integrated luminosity of 6 fb−1 collected at a center-of-mass energy of √𝑠=13 TeV with the LHCb detector. The 𝐶⁢𝑃-violation parameters are measured to be 𝑆𝜓⁢𝐾0𝑆=0.717±0.013⁢(stat)±0.008⁢(syst) and 𝐶𝜓⁢𝐾0𝑆=0.008±0.012⁢(stat)±0.003⁢(syst). This measurement of 𝑆𝜓⁢𝐾0𝑆 represents the most precise single measurement of the CKM angle 𝛽 to date and is more precise than the current world average. In addition, measurements of the 𝐶⁢𝑃-violation parameters of the individual channels are reported and a combination with the LHCb Run 1 measurements is performed.

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Measurement of the CKM angle $\gamma$ in the $B^0 \to D^0K^{*0}$ channel using self-conjugate $D^0 \to K_S^0 h^+h^-$ decays

2024 · ARTICLE · en

A model-independent study of CP violation in B0→DK∗0 decays is presented using data corresponding to an integrated luminosity of 9fb−1 collected by the LHCb experiment at centre-of-mass energies of s=7,8 and 13TeV. The CKM angle γ is determined by examining the distributions of signal decays in phase-space bins of the self-conjugate D→KS0h+h− decays, where h=π,K. Observables related to CP violation are measured and the angle γ is determined to be γ=(49−19+22)∘. Measurements of the amplitude ratio and strong-phase difference between the favoured and suppressed B0 decays are also presented.

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Measurement of the Z boson production cross-section in pp collisions at √s=5.02 TeV

2024 · ARTICLE · en

The first measurement of the Z boson production cross-section at centre-of-mass energy s = 5.02 TeV in the forward region is reported, using pp collision data collected by the LHCb experiment in year 2017, corresponding to an integrated luminosity of 100 ± 2 pb−1. The production cross-section is measured for final-state muons in the pseudorapidity range 2.0 4.5 with transverse momentum pT > 20 GeV/c. The integrated cross-section is determined to be σZ→μ+μ−=39.6±0.7(stat)±0.6(syst)±0.8(lumi)pb for the di-muon invariant mass in the range 60 μμ 120 GeV/c2. This result and the differential cross-section results are in good agreement with theoretical predictions at next-to-next-to-leading order in the strong coupling constant. Based on a previous LHCb measurement of the Z boson production cross-section in pPb collisions at sNN = 5.02 TeV, the nuclear modification factor RpPb is measured for the first time at this energy. The measured values are 1.2−0.3+0.5 (stat) ± 0.1(syst) in the forward region (1.53 yμ∗ 4.03) and 3.6−0.9+1.6 (stat) ± 0.2(syst) in the backward region (−4.97 yμ∗ 2.47), where yμ∗ represents the muon rapidity in the centre-of-mass frame.

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Observation of Cabibbo-suppressed two-body hadronic decays and precision mass measurement of the $\Omega_c^0$ baryon

2024 · ARTICLE · en

The first observation of the singly Cabibbo-suppressed Ω0𝑐→Ω−⁢𝐾+ and Ω0𝑐→Ξ−⁢𝜋+ decays is reported, using proton-proton collision data at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 5.4 fb−1, collected with the LHCb detector between 2016 and 2018. The branching fraction ratios are measured to be ℬ⁡(Ω0𝑐→Ω−⁢𝐾+)ℬ⁡(Ω0𝑐→Ω−⁢𝜋+)=[6.08±0.51⁢(stat)±0.40⁢(syst)]%,ℬ⁡(Ω0𝑐→Ξ−⁢𝜋+)ℬ⁡(Ω0𝑐→Ω−⁢𝜋+)=[15.81±0.87⁢(stat)±0.44⁢(syst)±0.16⁢(ext)]%. In addition, using the Ω0𝑐→Ω−⁢𝜋+ decay channel, the Ω0𝑐 baryon mass is measured to be 𝑀⁡(Ω0𝑐)=2695.28±0.07⁢(stat)±0.27⁢(syst)±0.30⁢(ext) MeV, improving the precision of the previous world average by a factor of 4.

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A search for rare B → Dμ+μ− decays

2024 · ARTICLE · en

A search for rare B → Dμ+μ− decays is performed using proton-proton collision data collected by the LHCb experiment, corresponding to an integrated luminosity of 9 fb−1. No significant signals are observed in the non-resonant μ+μ− modes, and upper limits of B(B0→D¯0μ+μ−)fc and fu are the fragmentation fractions of a B meson with a c and u quark respectively in proton-proton collisions. Each result is either the first such measurement or an improvement by three orders of magnitude on an existing limit. Separate upper limits are calculated when the muon pair originates from a J/ψ → μ+μ− decay. The branching fraction of Bc+→Ds+J/ψ multiplied by the fragmentation-fraction ratio is measured to be fcfu⋅B(Bc+→Ds+J/ψ)=(1.63±0.15±0.13)×10−5, where the first uncertainty is statistical and the second systematic.

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Improved measurement of CP violation parameters in $B_s^0\to J/\psi K^+K^-$ decays in the vicinty of the $\phi(1020)$ resonance

2024 · ARTICLE · en

The decay-time-dependent 𝐶⁢𝑃 asymmetry in 𝐵0𝑠→𝐽/𝜓⁡(→𝜇+⁢𝜇−)⁢𝐾+⁢𝐾− decays is measured using proton-proton collision data, corresponding to an integrated luminosity of 6 fb−1, collected with the LHCb detector at a center-of-mass energy of 13 TeV. Using a sample of approximately 349 000 𝐵0𝑠 signal decays with an invariant 𝐾+⁢𝐾− mass in the vicinity of the 𝜙⁡(1020) resonance, the 𝐶⁢𝑃-violating phase 𝜙𝑠 is measured, along with the difference in decay widths of the light and heavy mass eigenstates of the 𝐵0𝑠−¯𝐵0𝑠 system, Δ⁢Γ𝑠, and the difference of the average 𝐵0𝑠 and 𝐵0 meson decay widths, Γ𝑠−Γ𝑑. The values obtained are 𝜙𝑠=−0.039±0.022±0.006 rad, Δ⁢Γ𝑠=0.0845±0.0044±0.0024 ps−1, and Γ𝑠−Γ𝑑=−0.005⁢6+0.0013−0.0015±0.0014 ps−1, where the first uncertainty is statistical and the second systematic. These are the most precise single measurements to date and are consistent with expectations based on the Standard Model and with the previous LHCb analyses of this decay. These results are combined with previous independent LHCb measurements. The phase 𝜙𝑠 is also measured independently for each polarization state of the 𝐾+⁢𝐾− system and shows no evidence for polarization dependence.

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The LHCb Upgrade I

2024 · ARTICLE · en

The LHCb upgrade represents a major change of the experiment. The detectors have been almost completely renewed to allow running at an instantaneous luminosity five times larger than that of the previous running periods. Readout of all detectors into an all-software trigger is central to the new design, facilitating the reconstruction of events at the maximum LHC interaction rate, and their selection in real time. The experiment's tracking system has been completely upgraded with a new pixel vertex detector, a silicon tracker upstream of the dipole magnet and three scintillating fibre tracking stations downstream of the magnet. The whole photon detection system of the RICH detectors has been renewed and the readout electronics of the calorimeter and muon systems have been fully overhauled. The first stage of the all-software trigger is implemented on a GPU farm. The output of the trigger provides a combination of totally reconstructed physics objects, such as tracks and vertices, ready for final analysis, and of entire events which need further offline reprocessing. This scheme required a complete revision of the computing model and rewriting of the experiment's software.

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Measurement of $\Xi^{+}_{c}$ production in pPb collisions at $\sqrt{s_{\mathrm{NN}}}=8.16$ TeV at LHCb

2024 · ARTICLE · en

A study of prompt Ξ+𝑐 production in proton-lead collisions is performed with the LHCb experiment at a center-of-mass energy per nucleon pair of 8.16 TeV in 2016 in 𝑝⁢Pb and Pb⁢𝑝 collisions with an estimated integrated luminosity of approximately 12.5 and 17.4 nb−1, respectively. The Ξ+𝑐 production cross section, as well as the Ξ+𝑐 to Λ+𝑐 production cross-section ratio, are measured as a function of the transverse momentum and rapidity and compared to the latest theory predictions. The forward-backward asymmetry is also measured as a function of the Ξ+𝑐 transverse momentum. The results provide strong constraints on theoretical calculation and are a unique input for hadronization studies in different collision systems.

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Observation of muonic Dalitz decays of chib mesons and precise spectroscopy of hidden-beauty states

2024 · ARTICLE · en

The decays of the χb1(1P), χb2(1P), χb1(2P) and χb2(2P) mesons into the Υ(1S)μ+μ− final state are observed with a high significance using proton-proton collision data collected with the LHCb detector and corresponding to an integrated luminosity of 9 fb−1. The newly observed decays together with the Υ(2S) → Υ(1S)π+π− and Υ(3S) → Υ(2S)π+π− decay modes are used for precision measurements of the mass and mass splittings for the hidden-beauty states.

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Search for the rare decay of charmed baryon Λ c + into the p μ + μ - final state

2024 · ARTICLE · en

A search for the nonresonant Λc+→pμ+μ- decay is performed using proton-proton collision data recorded at a center-of-mass energy of 13 TeV by the LHCb experiment, corresponding to an integrated luminosity of 5.4 fb-1. No evidence for the decay is found in the dimuon invariant-mass regions where the expected contributions of resonances is subdominant. The upper limit on the branching fraction of the Λc+→pμ+μ- decay is determined to be 2.9(3.2)×10-8 at 90%(95%) confidence level. The branching fractions in the dimuon invariant-mass regions dominated by the η, ρ and ω resonances are also determined.

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Курсы (12)