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Гущин Михаил Иванович

Факультет компьютерных наук

Профиль на hse.ru ↗ тел.: 27261
Публикаций
313
Языков
3
Наград
7
Конференций
1
Профиль Публикации (313) Курсы (8)

Профессиональные интересы

анализ данныхфизика высоких энергий

Должности

  • Заместитель заведующего лабораторией — Факультет компьютерных наук, Институт искусственного интеллекта и цифровых наук, Научно-учебная лаборатория методов анализа больших данных
  • Ведущий 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

Био

  • · Начал работать в НИУ ВШЭ в 2017 году.
  • · Научно-педагогический стаж: 8 лет.

Образование

  • 2020 · Кандидат наук: Московский физико-технический институт (национальный исследовательский университет)
  • 2019 · Аспирантура: Московский физико-технический институт (национальный исследовательский университет), специальность «Информатика и вычислительная техника»
  • 2015 · Магистратура: Московский физико-технический институт (государственный университет), специальность «Прикладные математика и физика», квалификация «Магистр»
  • 2013 · Бакалавриат: Московский физико-технический институт (государственный университет), специальность «Прикладные математика и физика», квалификация «Бакалавр»

Опыт работы

  • · 2014 - 2017: Исследователь-разработчик в OOO "Яндекс"

Награды и поощрения

  • · Благодарность первого проректора НИУ ВШЭ (август 2024)
  • · Благодарность НИУ ВШЭ (май 2024)
  • · Благодарность проректора НИУ ВШЭ (сентябрь 2022)
  • · Благодарность факультета компьютерных наук НИУ ВШЭ (август 2022)
  • · Надбавка за публикацию в журнале из Списка А (и приравненном к нему научном издании) (2025–2026, 2024–2025, 2023–2024)
  • · Надбавка за публикацию в международном рецензируемом научном издании (2022–2023, 2021–2022, 2020–2022, 2018–2019)
  • · Лучший преподаватель — 2024

Гранты и проекты

  • — · на соискание учёной степени кандидата наук

Конференции (1)

Показать все
  • · 2021: ACAT 2021 (Daejeon). Доклад: Robust Neural Particle Identification Models

Идентификаторы исследователя

Публикации (313)

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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Latent Stochastic Differential Equations for Change Point Detection

2023 · ARTICLE · en

Automated analysis of complex systems based on multiple readouts remains a challenge. Change point detection algorithms are aimed to locating abrupt changes in the time series behaviour of a process. In this paper, we present a novel change point detection algorithm based on Latent Neural Stochastic Differential Equations (SDE). Our method learns a non-linear deep learning transformation of the process into a latent space and estimates a SDE that describes its evolution over time. The algorithm uses the likelihood ratio of the learned stochastic processes in different timestamps to find change points of the process. We demonstrate the detection capabilities and performance of our algorithm on synthetic and real-world datasets. The proposed method outperforms the state-of-the-art algorithms on the majority of our experiments.

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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.

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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.

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Курсы (8)