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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)

First Observation of a Doubly Charged Tetraquark and Its Neutral Partner

2023 · ARTICLE · en

A combined amplitude analysis is performed for the decays B0→¯¯¯D0D+sπ− and B+→D−D+sπ+, which are related by isospin symmetry. The analysis is based on data collected by the LHCb detector in proton-proton collisions at center-of-mass energies of 7, 8, and 13 TeV. The full data sample corresponds to an integrated luminosity of 9 fb−1. Two new resonant states with masses of 2.908±0.011±0.020 GeV and widths of 0.136±0.023±0.013 GeV are observed, which decay to D+sπ+ and D+sπ− respectively. The former state indicates the first observation of a doubly charged open-charm tetraquark state with minimal quark content [c¯su¯d], and the latter state is a neutral tetraquark composed of [c¯s¯ud] quarks. Both states are found to have spin-parity of 0+, and their resonant parameters are consistent with each other, which suggests that they belong to an isospin triplet.

DOI ↗

Amplitude analysis of B0 → D0D+s π− and B+ → D−D+s π+ decays

2023 · ARTICLE · en

Resonant contributions in B0 → D¯ 0 Dþ s π− and Bþ → D−Dþ s πþ decays are determined with an amplitude analysis, which is performed both separately and simultaneously, where in the latter case isospin symmetry between the decays is assumed. The analysis is based on data collected by the LHCb detector in proton-proton collisions at center-of-mass energies of 7, 8, and 13 TeV. The full data sample corresponds to an integrated luminosity of 9 fb−1. A doubly charged spin-0 open-charm tetraquark candidate together with a neutral partner, both with masses near 2.9 GeV, are observed in the Dsπ decay channel.

DOI ↗

Open charm production and asymmetry in pNe collisions at √sNN=68.5GeV

2023 · ARTICLE · en

A measurement of D0 meson production by the LHCb experiment in its fixed-target configuration is presented. The production of D0 mesons is studied with a beam of 2.5 TeV protons colliding on a gaseous neon target at rest, corresponding to a nucleon-nucleon centre-of-mass energy of sNN√ = 68.5 GeV. The sum of the D0 and D0 production cross-section in pNe collisions in the centre-of-mass rapidity range y⋆∈[−2.29,0] is found to be σy⋆∈[−2.29,0]D0=48.2±0.3±4.5μb/nucleon where the first uncertainty is statistical and the second is systematic. The D0−D0 production asymmetry is also evaluated and suggests a trend towards negative values at large negative y⋆. The considered models do not account precisely for all the features observed in the LHCb data, but theoretical predictions including 1% intrinsic charm and 10% recombination contributions better describe the data than the other models considered.

DOI ↗ PDF ↗

Charmonium production in pNe collisions at √sNN = 68.5 GeV

2023 · ARTICLE · en

The measurement of charmonium states produced in proton-neon (pNe) collisions by the LHCb experiment in its fixed-target configuration is presented. The production of J/ψ and ψ(2S) mesons is studied with a beam of 2.5 TeV protons colliding on gaseous neon targets at rest, corresponding to a nucleon-nucleon centre-of-mass energy sNN‾‾‾‾√=68.5 GeV. The data sample corresponds to an integrated luminosity of 21.7±1.4 nb−1. The J/ψ and ψ(2S) hadrons are reconstructed in μ+μ− final states. The J/ψ production cross-section per target nucleon in the centre-of-mass rapidity range y∗∈[−2.29,0] is found to be 506±8±25 nb/nucleon. The ψ(2S) to J/ψ relative production rate is found to be (1.67±0.27±0.10)% in good agreement with other measurements involving beam and target nuclei of similar sizes.

DOI ↗ PDF ↗

J/ψ and D0 production in √sNN = 68.5 GeV PbNe collisions

2023 · ARTICLE · en

The first measurement of J/ψ and D0 production in PbNe collisions by the LHCb experiment in its fixed-target configuration is reported. The production of J/ψ and D0 mesons is studied with a beam of lead ions with an energy of 2.5 TeV per nucleon colliding on gaseous neon targets at rest, corresponding to a nucleon-nucleon centre-of-mass energy of √sNN = 68.5 GeV. The J/ψ/D0 production cross-section ratio is studied as a function of rapidity, transverse momentum and collision centrality. These data are compared with measurements from pNe collisions at the same energy and show no difference in the observed J/ψ suppresion trend when comparing pNe and PbNe peripheral collisions with PbNe central collisions.

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Observation of the B0s→ D*+D*− decay

2023 · ARTICLE · en

The first observation of the Bs0 → D∗+D∗− decay and the measurement of its branching ratio relative to the B0 → D∗+D∗− decay are presented. The data sample used corresponds to an integrated luminosity of 9fb−1 of proton-proton collisions recorded by the LHCb experiment at centre-of-mass energies of 7, 8 and 13 TeV between 2011 and 2018. The decay is observed with more than 10 standard deviations and the time-integrated ratio of branching fractions is determined to be B(Bs0 → D∗+D∗−) = 0.269 ± 0.032 ± 0.011 ± 0.008 , B(B0 → D∗+D∗−) where the first uncertainty is statistical, the second systematic and the third due to the uncertainty of the fragmentation fraction ratio fs/fd. The Bs0 → D∗+D∗− branching fraction is calculated to be B(Bs0 → D∗+D∗−) = (2.15 ± 0.26 ± 0.09 ± 0.06 ± 0.16) × 10−4 , where the fourth uncertainty is due to the B0 → D∗+D∗− branching fraction. These results are calculated using the average Bs0 meson lifetime in simulation. Correction factors are reported for scenarios where either a purely heavy or a purely light Bs0 eigenstate is considered.

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Observation of the decays B0(s) → Ds1(2536)∓K±

2023 · ARTICLE · en

https://link.springer.com/article/10.1007/JHEP10(2023)106#Abs1

DOI ↗ PDF ↗

Observation of New Baryons in the Ξ−bπ+π−and Ξ0bπ+π− Systems

2023 · ARTICLE · en

https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.131.171901

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Observation and branching fraction measurement of the decay Ξ−b→Λ0bπ−

2023 · ARTICLE · en

https://journals.aps.org/prd/abstract/10.1103/PhysRevD.108.072002

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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

https://link.springer.com/article/10.1007/JHEP09(2023)129#Abs1

DOI ↗ PDF ↗

Курсы (12)