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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 the Branching Fractions B(B0→pp¯pp¯) and B(Bs0→pp¯pp¯)

2023 · ARTICLE · en

Searches for the rare hadronic decays B0→p¯pp¯p and B0s→p¯pp¯p are performed using proton-proton collision data recorded by the LHCb experiment and corresponding to an integrated luminosity of 9 fb−1. Significances of 9.3σ and 4.0σ, including statistical and systematic uncertainties, are obtained for the B0→p¯pp¯p and B0s→p¯pp¯p signals, respectively. The branching fractions are measured relative to the topologically similar normalization decays B0→J/ψ(→p¯p)K*0(→K+π−) and B0s→J/ψ(→p¯p)ϕ(→K+K−). The branching fractions are measured to be B(B0→p¯pp¯p)=(2.2±0.4±0.1±0.1)×10−8 and B(B0s→p¯pp¯p)=(2.3±1.0±0.2±0.1)×10−8. In these measurements, the first uncertainty is statistical, the second is systematic, and the third one is due to the external branching fraction of the normalization channel.

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Measurement of the Time-Integrated CP Asymmetry in D0→K-K+ Decays

2023 · ARTICLE · en

The time-integrated CP asymmetry in the Cabibbo-suppressed decay D0→K-K+ is measured using proton-proton collision data, corresponding to an integrated luminosity of 5.7 fb-1 collected at a center-of-mass energy of 13 TeV with the LHCb detector. The D0 mesons are required to originate from promptly produced D*+→D0π+ decays, and the charge of the companion pion is used to determine the flavor of the charm meson at production. The time-integrated CP asymmetry is measured to be ACP(K-K+)=[6.8±5.4±1.6]×10-4 where the first uncertainty is statistical and the second systematic. The direct CP asymmetries in D0→K-K+ and D0→π-π+ decays, aK-K+d and aπ-π+d, are derived by combining ACP(K-K+) with the time-integrated CP asymmetry difference, ΔACP=ACP(K-K+)-ACP(π-π+), and other inputs, giving aK-K+d=(7.7±5.7)×10-4,aπ-π+d=(23.2±6.1)×10-4,with a correlation coefficient corresponding to ρ=0.88. The compatibility of these results with CP symmetry is 1.4 and 3.8 standard deviations for D0→K-K+ and D0→π-π+ decays, respectively. This is the first evidence for direct CP violation in a specific D0 decay.

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Test of lepton flavor universality using B0→D*-τ+ντ decays with hadronic τ channels

2023 · ARTICLE · en

The branching fraction B(B0→D*−τ+ντ) is measured relative to that of the normalization mode B0→D*−π+π−π+ using hadronic τ+→π+π−π+(π0)¯ντ decays in proton-proton collision data at a center-of-mass energy of 13 TeV collected by the LHCb experiment, corresponding to an integrated luminosity of 2 fb−1. The measured ratio is B(B0→D*−τ+ντ)/B(B0→D*−π+π−π+)=1.70±0.10+0.11−0.10, where the first uncertainty is statistical and the second is related to systematic effects. Using established branching fractions for the B0→D*−π+π−π+ and B0→D*−μ+νμ modes, the lepton universality test R(D*−)≡B(B0→D*−τ+ντ)/B(B0→D*−μ+νμ) is calculated, R(D*−)=0.247±0.015±0.015±0.012, where the third uncertainty is due to the uncertainties on the external branching fractions. This result is consistent with the Standard Model prediction and with previous measurements.

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Search for D∗(2007)0 → μ+μ− in B− → π−μ+μ− decays

2023 · ARTICLE · en

The very rare D∗(2007)0 ⁣→μ+μ−{{D} ^*} (2007)^0\!\rightarrow {\mu ^+\mu ^-} D∗(2007)0→μ+μ− decay is searched for by analysing B− ⁣→π−μ+μ−{{{B} ^-}} \!\rightarrow {{\pi } ^-} {\mu ^+\mu ^-} B−→π−μ+μ− decays. The analysis uses a sample of beauty mesons produced in proton–proton collisions collected with the LHCb detector between 2011 and 2018, corresponding to an integrated luminosity of 9 fb−1\text {\,fb} ^{-1}fb−1. The signal signature corresponds to simultaneous peaks in the μ+μ−{\mu ^+\mu ^-} μ+μ− and π−μ+μ−{{\pi } ^-} {\mu ^+\mu ^-} π−μ+μ− invariant masses. No evidence for an excess of events over background is observed and an upper limit is set on the branching fraction of the decay at B(D∗(2007)0 ⁣→μ+μ−)

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Observation of the B+→Jψη′K+ decay

2023 · ARTICLE · en

The B+ →Jψη′K+ decay is observed for the first time using proton-proton collision data collected by the LHCb experiment at centre-of-mass energies of 7, 8, and 13 TeV, corresponding to a total integrated luminosity of 9 fb−1. The branching fraction of this decay is measured relative to the known branching fraction of the B+ →ψ(2S)K+ decay and found to beBB+→Jψη′K+BB+→ψ2SK+=4.91±0.47±0.29±0.07×10−2

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Search for CP violation in 𝐷+(𝑠) → K−K+K+ decays

2023 · ARTICLE · en

A search for direct CP violation in the Cabibbo-suppressed decay 𝐷+𝑠 → K−K+K+ and in the doubly Cabibbo-suppressed decay D+ → K−K+K+ is reported. The analysis is performed with data collected by the LHCb experiment in proton-proton collisions at a centre-of-mass energy of 13 TeV corresponding to an integrated luminosity of 5.6 fb−1. The search is conducted by comparing the 𝐷+(𝑠) and 𝐷−(𝑠) Dalitz-plot distributions through a model-independent binned technique, based on fits to the K−K+K+ invariant-mass distributions, with a total of 0.97 (1.27) million 𝐷+𝑠 (D+) signal candidates. The results are given as p-values for the hypothesis of CP conservation and are found to be 13.3% for the 𝐷+𝑠 → K−K+K+ decay and 31.6% for the D+ → K−K+K+ decay. No evidence for CP violation is observed in these decays.

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A study of 𝐶𝑃 violation in the decays 𝐵±→[𝐾+𝐾−π+π−]𝐷ℎ± (ℎ=𝐾,𝜋) and 𝐵±→[π+π−π+π−]𝐷ℎ±

2023 · ARTICLE · en

The first study of 𝐶𝑃 violation in the decay mode 𝐵±→[𝐾+𝐾−π+π−]𝐷ℎ±, with ℎ=𝐾,𝜋, is presented, exploiting a data sample of proton–proton collisions collected by the LHCb experiment that corresponds to an integrated luminosity of 9fb−1. The analysis is performed in bins of phase space, which are optimised for sensitivity to local 𝐶𝑃asymmetries. 𝐶𝑃-violating observables that are sensitive to the angle 𝛾 of the Unitarity Triangle are determined. The analysis requires external information on charm-decay parameters, which are currently taken from an amplitude analysis of LHCb data, but can be updated in the future when direct measurements become available. Measurements are also performed of phase-space integrated observables for 𝐵±→[𝐾+𝐾−π+π−]𝐷ℎ± and 𝐵±→[π+π−π+π−]𝐷ℎ± decays.

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Λ+𝑐 polarimetry using the dominant hadronic mode

2023 · ARTICLE · en

The polarimeter vector field for multibody decays of a spin-half baryon is introduced as a generalisation of the baryon asymmetry parameters. Using a recent amplitude analysis of the Λ+𝑐 → pK−π+ decay performed at the LHCb experiment, we compute the distribution of the kinematic-dependent polarimeter vector for this process in the space of Mandelstam variables to express the polarised decay rate in a model-agnostic form. The obtained representation can facilitate polarisation measurements of the Λ+𝑐 baryon and eases inclusion of the Λ+𝑐 → pK−π+ decay mode in hadronic amplitude analyses.

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Measurement of Υ production in pp collisions at √𝑠 = 5 TeV

2023 · ARTICLE · en

The production cross-sections of Υ mesons, namely Υ(1S), Υ(2S) and Υ(3S), in ppcollisions at √𝑠 = 5 TeV are measured with a data sample corresponding to an integrated luminosity of 9.13 ± 0.18 pb−1 collected by the LHCb detector. The Υ mesons are reconstructed in the decay mode Υ → μ+μ−. Double differential cross-sections times branching fractions, as functions of the transverse momentum pT and the rapidity y of the Υ mesons, are measured in the range pT 20 GeV/c and 2.0 4.5. The results integrated over these pT and y ranges are

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First observation and branching fraction measurement of the Λ0𝑏→𝐷−𝑠𝑝 decay

2023 · ARTICLE · en

The first observation of the Λ0𝑏→𝐷−𝑠𝑝 decay is presented using proton-proton collision data collected by the LHCb experiment at a centre-of-mass energy of √𝑠 = 13 TeV, corresponding to a total integrated luminosity of 6 fb−1. Using the Λ0𝑏→Λ+𝑐𝜋− decay as the normalisation mode, the branching fraction of the Λ0𝑏→𝐷−𝑠𝑝 decay is measured to be (Λ0𝑏→𝐷−𝑠𝑝)=(12.6±0.5±0.3±1.2)×10−6, where the first uncertainty is statistical, the second systematic and the third due to uncertainties in the branching fractions of the Λ0𝑏→Λ+𝑐𝜋−, 𝐷−𝑠→𝐾−𝐾+𝜋− and Λ+𝑐→𝑝𝐾−𝜋+ decays.

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Курсы (12)