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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 Time-Dependent 𝐶⁢𝑃 Violation in 𝐷0→𝜋+⁢𝜋−⁢𝜋0 Decays

2024 · ARTICLE · en

A measurement of time-dependent 𝐶⁢𝑃 violation in 𝐷0→𝜋+⁢𝜋−⁢𝜋0 decays using a 𝑝⁢𝑝 collision data sample collected by the LHCb experiment in 2012 and from 2015 to 2018, corresponding to an integrated luminosity of 7.7 fb−1, is presented. The initial flavor of each 𝐷0 candidate is determined from the charge of the pion produced in the 𝐷*⁢(2010)+→𝐷0⁢𝜋+ decay. The decay 𝐷0→𝐾−⁢𝜋+⁢𝜋0 is used as a control channel to validate the measurement procedure. The gradient of the time-dependent 𝐶⁢𝑃 asymmetry Δ⁢𝑌 in 𝐷0→𝜋+⁢𝜋−⁢𝜋0 decays is measured to be Δ⁢𝑌=(−1.3±6.3±2.4)×10−4, where the first uncertainty is statistical and the second is systematic, which is compatible with 𝐶⁢𝑃 conservation.

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Amplitude analysis and branching fraction measurement of B+→D∗−D+sπ+ decays

2024 · ARTICLE · en

The decays of the B+ meson to the final state D∗−Ds+π+ are studied in proton-proton collision data collected with the LHCb detector at centre-of-mass energies of 7, 8, and 13 TeV, corresponding to a total integrated luminosity of 9 fb−1. The ratio of branching fractions of the B+→D∗−Ds+π+ and B0→D∗−Ds+ decays is measured to be 0.173 ± 0.006 ± 0.010, where the first uncertainty is statistical and the second is systematic. Using partially reconstructed Ds∗+→Ds+γ and Ds+π0 decays, the ratio of branching fractions between the B+→D∗−Ds∗+π+ and B+→D∗−Ds+π+ decays is determined as 1.31 ± 0.07 ± 0.14. An amplitude analysis of the B+→D∗−Ds+π+ decay is performed for the first time, revealing dominant contributions from known excited charm resonances decaying to the D*−π+ final state. No significant evidence of exotic contributions in the Ds+π+ or D∗−Ds+ channels is found. The fit fraction of the scalar state Tcs¯0∗(2900)++ observed in the B+→D−Ds+π+ decay is determined to be less than 2.3% at a 90% confidence level.

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First observation of $\Lambda_b^{0} \to \Sigma_c^{(*)++} D^{(*)-} K^{-}$ decays

2024 · ARTICLE · en

The four decays, Λ0𝑏→Σ(*)++𝑐⁢𝐷(*)−⁢𝐾−, are observed for the first time using proton-proton collision data collected with the LHCb detector at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 6 fb−1. By considering the Λ0𝑏→Λ+𝑐⁢¯𝐷0⁢𝐾− decay as reference channel, the following branching fraction ratios are measured to be ℬ⁡(Λ0𝑏→Σ++𝑐⁢𝐷−⁢𝐾−)ℬ⁡(Λ0𝑏→Λ+𝑐⁢¯𝐷0⁢𝐾−)=0.282±0.016±0.016±0.005, ℬ⁡(Λ0𝑏→Σ*++𝑐⁢𝐷−⁢𝐾−)ℬ⁡(Λ0𝑏→Σ++𝑐⁢𝐷−⁢𝐾−)=0.460±0.052±0.028, ℬ⁡(Λ0𝑏→Σ++𝑐⁢𝐷*−⁢𝐾−)ℬ⁡(Λ0𝑏→Σ++𝑐⁢𝐷−⁢𝐾−)=2.261±0.202±0.129±0.046, ℬ⁡(Λ0𝑏→Σ*++𝑐⁢𝐷*−⁢𝐾−)ℬ⁡(Λ0𝑏→Σ++𝑐⁢𝐷−⁢𝐾−)=0.896±0.137±0.066±0.018, where the first uncertainties are statistical, the second are systematic, and the third are due to uncertainties in the branching fractions of intermediate particle decays. These initial observations mark the beginning of pentaquark searches in these modes, with more datasets to become available following the LHCb upgrade.

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Search for prompt production of pentaquarks in charm hadron final states

2024 · ARTICLE · en

A search for hidden-charm pentaquark states decaying to a range of Σ𝑐⁢¯𝐷 and Λ+𝑐⁢¯𝐷 final states, as well as doubly charmed pentaquark states to Σ𝑐⁢𝐷 and Λ+𝑐⁢𝐷, is made using samples of proton-proton collision data corresponding to an integrated luminosity of 5.7 fb−1 recorded by the LHCb detector at √𝑠=13 TeV. Since no significant signals are found, upper limits are set on the pentaquark yields relative to that of the Λ+𝑐 baryon in the Λ+𝑐→𝑝⁢𝐾−⁢𝜋+ decay mode. The known pentaquark states are also investigated, and their signal yields are found to be consistent with zero in all cases.

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Search for $B_s^0\to \mu^+\mu^- \gamma$ decay

2024 · ARTICLE · en

A search for the fully reconstructed Bs0 → μ+μ−γ decay is performed at the LHCb experiment using proton-proton collisions at s = 13 TeV corresponding to an integrated luminosity of 5.4 fb−1. No significant signal is found and upper limits on the branching fraction in intervals of the dimuon mass are set B(Bs0→μ+μ−γ) at 95% confidence level. Additionally, upper limits are set on the branching fraction in the [2mμ, 1.70] GeV/c2 dimuon mass region excluding the contribution from the intermediate ϕ(1020) meson, and in the region combining all dimuon-mass intervals.

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Amplitude analysis of the $\Lambda_b \to p K^- \gamma$ decay

2024 · ARTICLE · en

The resonant structure of the radiative decay Λb0→pK−γ in the region of proton-kaon invariant-mass up to 2.5 GeV/c2 is studied using proton-proton collision data recorded at centre-of-mass energies of 7, 8, and 13 TeV collected with the LHCb detector, corresponding to a total integrated luminosity of 9 fb−1. Results are given in terms of fit and interference fractions between the different components contributing to this final state. Only Λ resonances decaying to pK− are found to be relevant, where the largest contributions stem from the Λ(1520), Λ(1600), Λ(1800), and Λ(1890) states.

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First observation of the $\Lambda^0_b \to D^+D^- \Lambda$ decay

2024 · ARTICLE · en

The Λb0 → D+D−Λ decay is observed for the first time using proton-proton collision data collected by the LHCb experiment at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 5.3 fb−1. Using the B0 → D+D−KS0 decay as a reference channel, the product of the relative production cross-section and decay branching fractions is measured to be R=σΛb0σB0=B(Λb0→D+D−Λ)B(B0→D+D−KS0)=0.179±0.022±0.014, where the first uncertainty is statistical and the second is systematic. The known branching fraction of the reference channel, B(B0→D+D−KS0), and the cross-section ratio, σΛb0/σB0, previously measured by LHCb are used to derive the branching fraction of the Λb0 → D+D−Λ decay B(Λb0→D+D−Λ)=(1.24±0.15±0.10±0.28±0.11)×10−4, where the third and fourth contributions are due to uncertainties of B(B0→D+D−KS0) and σΛb0/σB0, respectively. Inspection of the D+Λ and D+D− invariant-mass distributions suggests a rich presence of intermediate resonances in the decay. The Λb0 → D*+D−Λ decay is also observed for the first time as a partially reconstructed component in the D+D−Λ invariant mass spectrum.

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Modification of $\chi_{c1}(3872)$ and $\psi(\rm 2S)$ production in $p$Pb collisions at $\sqrt{s_{NN}} = 8.16$ TeV

2024 · ARTICLE · en

The LHCb Collaboration measures production of the exotic hadron 𝜒𝑐⁢1⁡(3872) in proton-nucleus collisions for the first time. Comparison with the charmonium state 𝜓⁡(2⁢𝑆) suggests that the exotic 𝜒𝑐⁢1⁡(3872) experiences different dynamics in the nuclear medium than conventional hadrons, and comparison with data from proton-proton collisions indicates that the presence of the nucleus may modify 𝜒𝑐⁢1⁡(3872) production rates. This is the first measurement of the nuclear modification factor of an exotic hadron.

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Measurement of the branching fraction of B0 → J/ψπ0 decays

2024 · ARTICLE · en

The ratio of branching fractions between B0 → J/ψπ0 and B+ → J/ψK*+ decays is measured with proton-proton collision data collected by the LHCb experiment, corresponding to an integrated luminosity of 9 fb−1. The measured value is BB0→J/ψπ0BB+→J/ψK∗+=(1.153±0.053±0.048)×10−2, where the first uncertainty is statistical and the second is systematic. The branching fraction for B0 → J/ψπ0 decays is determined using the branching fraction of the normalisation channel, resulting in BB0→J/ψπ0=(1.670±0.077±0.069±0.095)×10−5, where the last uncertainty corresponds to that of the external input. This result is consistent with the current world average value and competitive with the most precise single measurement to date.

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Observation of the $B_c^+ \to J/\psi \pi^+ \pi^0$ decay

2024 · ARTICLE · en

The first observation of the Bc+→J/ψπ+π0 decay is reported with high significance using proton-proton collision data, corresponding to an integrated luminosity of 9 fb−1, collected with the LHCb detector at centre-of-mass energies of 7, 8, and 13 TeV. The ratio of its branching fraction relative to the Bc+→J/ψπ+ channel is measured to be BBc+→J/ψπ+π0BBc+→J/ψπ+=2.80±0.15±0.11±0.16, where the first uncertainty is statistical, the second systematic and the third related to imprecise knowledge of the branching fractions for B+ → J/ψK*+ and Bc+→J/ψπ+ decays, which are used to determine the π0 detection efficiency. The π+π0 mass spectrum is found to be consistent with the dominance of an intermediate ρ+ contribution in accordance with a model based on QCD factorisation.

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Курсы (8)