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Карпов Максим Евгеньевич

Факультет компьютерных наук

Профиль на hse.ru ↗ тел.: 27240
Публикаций
123
Языков
2
Наград
8
Конференций
1
Профиль Публикации (123) Курсы (31)

Профессиональные интересы

машинное обучениеанализ данныхглубинное обучение

Должности

  • Старший преподаватель — Факультет компьютерных наук, Департамент больших данных и информационного поиска

Био

  • · Начал работать в НИУ ВШЭ в 2017 году.
  • · Научно-педагогический стаж: 7 лет.

Образование

  • 2022 · Аспирантура: Национальный исследовательский университет "Высшая школа экономики", специальность «Информатика и вычислительная техника», квалификация «Исследователь. Преподаватель-исследователь»
  • 2020 · Магистратура: Национальный исследовательский университет "Высшая школа экономики", факультет: компьютерных наук, специальность «Прикладная математика и информатика», квалификация «Магистр»
  • 2014 · Специалитет: Московский государственный университет им. М.В. Ломоносова, факультет: глобальных процессов, специальность «Международные отношения», квалификация «Специалист в области международных отношений»

Опыт работы

  • · 09.2021: наст.время старший преподаватель Департамента больших данных и информационного поиска ФКН
  • · 04.2019 – 08.2021: преподаватель Департамента больших данных и информационного поиска ФКН
  • · 03.2021 – 08.2024: младший научный сотрудник лаборатории LAMBDA
  • · 10.2017 – 03.2021: стажер-исследователь лаборатории LAMBDA

Награды и поощрения

  • · Благодарность первого проректора НИУ ВШЭ (август 2024)
  • · Благодарность старшего директора по основным образовательным программам НИУ ВШЭ (май 2023)
  • · 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)
  • · Надбавка за регулярные публикации в международных рецензируемых научных изданиях (2025–2030, 2024–2029)
  • · Лучший преподаватель — 2025
  • · Группа высокого профессионального потенциала (кадровый резерв НИУ ВШЭ)Категория "Новые исследователи" (2019)

Гранты и проекты

  • 2022 · Исполнитель по гранту РФФИ «‎Проекты фундаментальных научных исследований, выполняемые молодыми учеными, обучающимися в аспирантуре» № заявки 20-37-90136, тема проекта: «‎Разработка методов обработки естественного языка для обнаружения аномалий в журналах событий систем хранения больших данных» (2020 - 2022 гг.) под руководством заведующего лабораторией Устюжанина Андрея Евгеньевича.

Конференции (1)

Показать все
  • · 2022: 46-я школа-конференция ИППИ РАН «Информационные технологии и системы» (ИТиС-2022) (Огниково Московской области). Доклад: Predicting a Next Activity in Event Logs: an Approach based on LSTMs and Gradient Boosting

Идентификаторы исследователя

Публикации (123)

Observation of a new excited D+s meson in B0 to D−D+K+π− decays

2021 · ARTICLE · en

Using pppp collision data corresponding to an integrated luminosity of 5.4fb−15.4fb−1 collected with the LHCb detector at a center-of-mass energy of 13TeV13TeV, the B0→D−D+K+π−B0→D−D+K+π− decay is studied. A new excited D+sDs+ meson is observed decaying into the D+K+π−D+K+π− final state with large statistical significance. The pole mass and width, and the spin-parity of the new state are measured with an amplitude analysis to be mR=2591±6±7MeVmR=2591±6±7MeV, ΓR=89±16±12MeVΓR=89±16±12MeV and JP=0−JP=0−, where the first uncertainty is statistical and the second systematic. Fit fractions for all components in the amplitude analysis are also reported. The new resonance, denoted as Ds0(2590)+Ds0(2590)+, is a strong candidate to be the Ds(21S0)+Ds(21S0)+ state, the radial excitation of the pseudoscalar ground-state D+sDs+ meson.

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Observation of the suppressed Lambda 0 b rightarrow DpK - decay with D rightarrow K + pi - and measurement of its CP asymmetry

2021 · ARTICLE · en

A study of baryon decays to the Dp\Km final state is presented based on a proton-proton collision data sample corresponding to an integrated luminosity of 9\invfb collected with the LHCb detector. Two decays are considered, \Lb→D\proton\Km with D→\Km\pip and D→\Kp\pim, where D represents a superposition of and states. The latter process is expected to be suppressed relative to the former, and is observed for the first time. The ratio of branching fractions of the two decays is measured, and the asymmetry of the suppressed mode, which is sensitive to the CKM angle γ, is also reported.

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First measurement of the CP-violating phase in Bs0 → J / ψ ( → e + e - ) ϕ decays

2021 · ARTICLE · en

A flavour-tagged time-dependent angular analysis of {{B} ^0_{s}} \!\rightarrow {{J /\psi }} \phi decays is presented where the {J /\psi } meson is reconstructed through its decay to an e ^+e ^- pair. The analysis uses a sample of pp collision data recorded with the LHCb experiment at centre-of-mass energies of 7 and 8\text {\,Te V} , corresponding to an integrated luminosity of 3 \text {\,fb} ^{-1} . The C\!P-violating phase and lifetime parameters of the {B} ^0_{s} system are measured to be {\phi _{{s}}} =0.00\pm 0.28\pm 0.07\text {\,rad}, {\Delta \Gamma _{{s}}} =0.115\pm 0.045\pm 0.011\text {\,ps} ^{-1} and {\Gamma _{{s}}} =0.608\pm 0.018\pm 0.012\text {\,ps} ^{-1} where the first uncertainty is statistical and the second systematic. This is the first time that C\!P-violating parameters are measured in the {{B} ^0_{s}} \!\rightarrow {{J /\psi }} \phi decay with an e ^+e ^- pair in the final state. The results are consistent with previous measurements in other channels and with the Standard Model predictions.

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Simultaneous determination of CKM angle γ and charm mixing parameters

2021 · ARTICLE · en

A combination of measurements sensitive to the CP violation angle γ of the Cabibbo-Kobayashi-Maskawa unitarity triangle and to the charm mixing parameters that describe oscillations between D0 and 𝐷⎯⎯⎯⎯⎯D¯0 mesons is performed. Results from the charm and beauty sectors, based on data collected with the LHCb detector at CERN’s Large Hadron Collider, are combined for the first time. This method provides an improvement on the precision of the charm mixing parameter y by a factor of two with respect to the current world average. The charm mixing parameters are determined to be 𝑥=(0.400+0.052−0.053)%x=(0.400−0.053+0.052)% and y = (0.630+0.033−0.030)%(0.630−0.030+0.033)%. The angle γ is found to be γ = (65.4+3.8−4.2)∘(65.4−4.2+3.8)∘ and is the most precise determination from a single experiment.

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Search for the doubly charmed baryon 𝛯+𝑐𝑐 in the 𝛯+𝑐𝜋−𝜋+ final state

2021 · ARTICLE · en

A search for the doubly charmed baryon 𝛯+𝑐𝑐Ξcc+ is performed in the 𝛯+𝑐𝜋−𝜋+Ξc+π−π+ invariant-mass spectrum, where the 𝛯+𝑐Ξc+ baryon is reconstructed in the pK−π+ final state. The study uses proton-proton collision data collected with the LHCb detector at a centre- of-mass energy of 13 TeV, corresponding to a total integrated luminosity of 5.4 fb−1. No significant signal is observed in the invariant-mass range of 3.4–3.8 GeV/c2. Upper limits are set on the ratio of branching fractions multiplied by the production cross-section with respect to the 𝛯++𝑐𝑐Ξcc++ → (𝛯+𝑐Ξc+ → pK−π+)π+ decay for different 𝛯+𝑐𝑐Ξcc+ mass and lifetime hypotheses in the rapidity range from 2.0 to 4.5 and the transverse momentum range from 2.5 to 25 GeV/c. The results from this search are combined with a previously published search for the 𝛯+𝑐𝑐Ξcc+ → 𝛬+𝑐Λc+K−π+ decay mode, yielding a maximum local significance of 4.0 standard deviations around the mass of 3620 MeV/c2, including systematic uncertainties. Taking into account the look-elsewhere effect in the 3.5–3.7 GeV/c2 mass window, the combined global significance is 2.9 standard deviations including systematic uncertainties.

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Updated search for 𝐵+𝑐 decays to two charm mesons

2021 · ARTICLE · en

A data set corresponding to an integrated luminosity of 9 fb−1 of proton-proton collisions collected by the LHCb experiment has been analysed to search for 𝐵+𝑐→𝐷(∗)+(𝑠)(---)𝐷(∗)0Bc+→D(s)(∗)+(---)D(∗)0 decays. The decays are fully or partially reconstructed, where one or two missing neutral pions or photons from the decay of an excited charm meson are allowed. Upper limits for the branching fractions, normalised to B+ decays to final states with similar topologies, are obtained for sixteen 𝐵+𝑐Bc+ decay modes. For the decay 𝐵+𝑐→𝐷+𝑠𝐷⎯⎯⎯⎯⎯0Bc+→Ds+D¯0, an excess with a significance of 3.4 standard deviations is found.

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Measurement of J/ψ production cross-sections in pp collisions at s√ = 5 TeV

2021 · ARTICLE · en

The production cross-sections of J/ψ mesons in proton-proton collisions at a centre-of-mass energy of 𝑠√s = 5 TeV are measured using a data sample corresponding to an integrated luminosity of 9.13 ± 0.18 pb−1, collected by the LHCb experiment. The cross-sections are measured differentially as a function of transverse momentum, pT, and rapidity, y, and separately for J/ψ mesons produced promptly and from beauty hadron decays (nonprompt). With the assumption of unpolarised J/ψ mesons, the production cross-sections integrated over the kinematic range 0 T 20 GeV/c and 2.0 4.5 are 𝜎prompt 𝐽/𝜓=8.154±0.010±0.283 μb,𝜎nonprompt 𝐽/𝜓=0.820±0.003±0.034 μb,σprompt J/ψ=8.154±0.010±0.283 μb,σnonprompt J/ψ=0.820±0.003±0.034 μb, where the first uncertainties are statistical and the second systematic. These cross-sections are compared with those at 𝑠√s = 8 TeV and 13 TeV, and are used to update the measurement of the nuclear modification factor in proton-lead collisions for J/ψ mesons at a centre-of-mass energy per nucleon pair of 𝑠NN‾‾‾‾√sNN = 5 TeV. The results are compared with theoretical predictions.

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Precise measurement of the fs/fd ratio of fragmentation fractions and of Bs0 decay branching fractions

2021 · ARTICLE · en

The ratio of the B0s and B0 fragmentation fractions, fs=fd, in proton-proton collisions at the LHC, is obtained as a function of B-meson transverse momentum and collision center-of-mass energy from the combined analysis of different B-decay channels measured by the LHCb experiment. The results are described by a linear function of the meson transverse momentum or with a function inspired by Tsallis statistics. Precise measurements of the branching fractions of the B0s → J=ψφ and B0s → D−s πþ decays are performed, reducing their uncertainty by about a factor of 2 with respect to previous world averages. Numerous B0s decay branching fractions, measured at the LHCb experiment, are also updated using the new values of fs=fd and branching fractions of normalization channels. These results reduce a major source of systematic uncertainty in several searches for new physics performed through measurements of B0s branching fractions.

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Search for the doubly heavy baryons Ω0bc and Ξ0bc decaying to Λ+cπ− and Ξ+cπ−

2021 · ARTICLE · en

The first search for the doubly heavy Ω0bc baryon and a search for Ξ0bc baryon are performed using pp collision data collected via the LHCb experiment from 2016 to 2018 at a centre-of-mass energy of 13TeV, corresponding to an integrated luminosity of 5.2fb−1. The baryons are reconstructed via their decays to Λ+cπ− and Ξ+cπ−. No significant excess is found for invariant masses between 6700 and 7300MeV/c2, in a rapidity range from 2.0 to 4.5 and a transverse momentum range from 2 to 20GeV/c. Upper limits are set on the ratio of the Ω0bc and Ξ0bc production cross-section times the branching fraction to Λ+cπ− (Ξ+cπ−) relative to that of the Λ0b (Ξ0b) baryon, for different lifetime hypotheses, at 95% confidence level. The upper limits range from 0.5×10−4 to 2.5×10−4 for the Ω0bc→Λ+cπ− (Ξ0bc→Λ+cπ−) decay, and from 1.4×10−3 to 6.9×10−3 for the Ω0bc→Ξ+cπ− (Ξ0bc→Ξ+cπ−) decay, depending on the considered mass and lifetime of the Ω0bc (Ξ0bc) baryon.

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Search for CP violation in Ξ−b→pK−K−decays

2021 · ARTICLE · en

A search for CP violation in charmless three-body Ξ−b→pK−K− decays is performed using pp collision data recorded with the LHCb detector, corresponding to integrated luminosities of 1 fb−1 at a center-of-mass energy √s=7 TeV, 2 fb−1 at √s=8 TeV and 2 fb−1 at √s=13 TeV. A good description of the phase-space distribution is obtained with an amplitude model containing contributions from Σ(1385), Λ(1405), Λ(1520), Λ(1670), Σ(1775) and Σ(1915) resonances. The model allows for CP -violation effects, which are found to be consistent with zero. The branching fractions of Ξ−b→Σ(1385)K−, Ξ−b→Λ(1405)K−, Ξ−b→Λ(1520)K−, Ξ−b→Λ(1670)K−, Ξ−b→Σ(1775)K− and Ξ−b→Σ(1915)K− decays are also reported. In addition, an upper limit is placed on the product of ratios of Ω−b and Ξ−b fragmentation fractions and the Ω−b→pK−K− and Ξ−b→pK−K− branching fractions.

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Курсы (31)