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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)

Observation of sizeable ω contribution to χc1(3872)→π+π−J/ψ decays

2023 · ARTICLE · en

https://journals.aps.org/prd/abstract/10.1103/PhysRevD.108.L011103

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Nuclear Modification Factor of Neutral Pions in the Forward and Backward Regions in p−Pb Collisions

2023 · ARTICLE · en

https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.131.042302

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Search for the doubly heavy baryon Ξbc+ decaying to J/ψΞc+

2023 · ARTICLE · en

https://iopscience.iop.org/article/10.1088/1674-1137/ace9c8#artAbst

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Search for CP violation in the phase space of D0 → π−π+π0 decays with the energy test

2023 · ARTICLE · en

A search for CP violation in D0 → π−π+π0 decays is reported, using pp collision data collected by the LHCb experiment from 2015 to 2018 corresponding to an integrated luminosity of 6 fb−1. An unbinned model-independent approach provides sensitivity to local CP violation within the two-dimensional phase space of the decay. The method is validated using the Cabibbo-favoured channel D0 → K−π+π0 and background regions of the signal mode. The results are consistent with CP symmetry in this decay.

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Precise determination of the 𝐵0s–𝐵⎯⎯⎯⎯0s oscillation frequency

2022 · ARTICLE · en

Mesons comprising a beauty quark and strange quark can oscillate between particle (𝐵0sBs0) and antiparticle (𝐵⎯⎯⎯⎯0sB¯s0) flavour eigenstates, with a frequency given by the mass difference between heavy and light mass eigenstates, Δms. Here we present a measurement of Δms using 𝐵0s→𝐷−sBs0→Ds−π+ decays produced in proton–proton collisions collected with the LHCb detector at the Large Hadron Collider. The oscillation frequency is found to be Δms = 17.7683 ± 0.0051 ± 0.0032 ps−1, where the first uncertainty is statistical and the second is systematic. This measurement improves on the current Δms precision by a factor of two. We combine this result with previous LHCb measurements to determine Δms = 17.7656 ± 0.0057 ps−1, which is the legacy measurement of the original LHCb detector.

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Measurement of χc1(3872) production in proton-proton collisions at √s = 8 and 13 TeV

2022 · ARTICLE · en

The production cross-section of the χc1(3872) state relative to the ψ(2S) meson is measured using proton-proton collision data collected with the LHCb experiment at centre-of-mass energies of √s = 8 and 13TeV, corresponding to integrated luminosities of 2.0 and 5.4fb−1, respectively. The two mesons are reconstructed in the J/ψπ+π− final state. The ratios of the prompt and nonprompt χc1(3872) to ψ(2S) production cross-sections are measured as a function of transverse momentum, pT, and rapidity, y, of theχc1(3872) and ψ(2S) states, in the kinematic range 4

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Measurement of the lifetimes of promptly produced Ωc0 and Ξc0 baryons

2022 · ARTICLE · en

A measurement of the lifetimes of the Ωc0 and Ξc0 baryons is reported using proton-proton collision data at a centre-of-mass energy of 13TeV, corresponding to an integrated luminosity of 5.4 fb−1 collected by the LHCb experiment. The Ωc0 and Ξc0 baryons are produced directly from proton interactions and reconstructed in the pK−K−π+ final state. The Ωc0 lifetime is measured to be 276.5 ± 13.4 ± 4.4 ± 0.7 fs, and the Ξc0 lifetime is measured to be 148.0 ± 2.3 ± 2.2 ± 0.2 fs, where the first uncertainty is statistical, the second systematic, and the third due to the uncertainty on the D0 lifetime. These results confirm previous LHCb measurements based on semileptonic beauty-hadron decays, which disagree with earlier results of a four times shorter Ωc0 lifetime, and provide the single most precise measurement of the Ωc0 lifetime.

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Measurement of the W boson mass

2022 · ARTICLE · en

The W boson mass is measured using proton-proton collision data at s√s = 13 TeV corresponding to an integrated luminosity of 1.7 fb−1 recorded during 2016 by the LHCb experiment. With a simultaneous fit of the muon q/pT distribution of a sample of W → μν decays and the ϕ* distribution of a sample of Z → μμ decays the W boson mass is determined to be (formula) where uncertainties correspond to contributions from statistical, experimental systematic, theoretical and parton distribution function sources. This is an average of results based on three recent global parton distribution function sets. The measurement agrees well with the prediction of the global electroweak fit and with previous measurements.

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Observation of the Decay Λ0b→Λ+cτ−¯ντ

2022 · ARTICLE · en

The first observation of the semileptonic b-baryon decay Λ0b→Λ+cτ−¯ντ, with a significance of 6.1σ, is reported using a data sample corresponding to 3 fb−1 of integrated luminosity, collected by the LHCb experiment at center-of-mass energies of 7 and 8 TeV at the LHC. The τ− lepton is reconstructed in the hadronic decay to three charged pions. The ratio K=B(Λ0b→Λ+cτ−¯ντ)/B(Λ0b→Λ+cπ−π+π−) is measured to be 2.46±0.27±0.40, where the first uncertainty is statistical and the second systematic. The branching fraction B(Λ0b→Λ+cτ−¯ντ)=(1.50±0.16±0.25±0.23)% is obtained, where the third uncertainty is from the external branching fraction of the normalization channel Λ0b→Λ+cπ−π+π−. The ratio of semileptonic branching fractions R(Λ+c)≡B(Λ0b→Λ+cτ−¯ντ)/B(Λ0b→Λ+cμ−¯νμ) is derived to be 0.242±0.026±0.040±0.059, where the external branching fraction uncertainty from the channel Λ0b→Λ+cμ−¯νμ contributes to the last term. This result is in agreement with the standard model prediction.

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Observation of the B0 →¯D*0 K+ π− and B0s →¯D*0 K−π+ decays

2022 · ARTICLE · en

The first observations of B0→¯D∗(2007)0K+π− and B0s→¯D∗(2007)0K−π+ decays are presented, and their branching fractions relative to that of the B0→¯D∗(2007)0π+π− decay are reported. These modes can potentially be used to investigate the spectroscopy of charm and charm-strange resonances and to determine the angle γ of the Cabibbo-Kobayashi-Maskawa unitarity triangle. It is also important to understand them as a source of potential background in determinations of γ from B+→DK+ and B0→DK+π− decays. The analysis is based on a sample corresponding to an integrated luminosity of 5.4 fb−1 of proton-proton collision data at 13 TeV center-of-mass energy recorded with the LHCb detector. The ¯D∗(2007)0 mesons are fully reconstructed in the ¯D0π0 and ¯D0γ channels with the ¯D0→K+π− decay. A novel weighting method is used to subtract background while simultaneously applying an event-by-event efficiency correction to account for resonant structures in the decays.

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Курсы (12)