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Деркач Денис Александрович

Факультет компьютерных наук

Профиль на hse.ru ↗ тел.: 27266
Публикаций
226
Языков
3
Наград
6
Конференций
0
Профиль Публикации (226) Курсы (9)

Профессиональные интересы

физика высоких энергийанализ данных

Должности

  • Заведующий лабораторией — 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
  • Научный руководитель образовательной программы — Умные устройства: аппаратная разработка

Био

  • · Начал работать в НИУ ВШЭ в 2015 году.
  • · Научно-педагогический стаж: 7 лет.

Образование

  • 2010 · PhD: Университет Париж XI
  • 2007 · Магистратура: Санкт-Петербургский государственный университет, специальность «Физика», квалификация «Магистр»
  • 2004 · Бакалавриат: Санкт-Петербургский государственный университет, специальность «Физика», квалификация «Бакалавр»

Опыт работы

  • · 2017: н. в

Награды и поощрения

  • · Медаль "Признание - 10 лет успешной работы" НИУ ВШЭ (сентябрь 2025)
  • · Благодарность первого проректора НИУ ВШЭ (август 2024)
  • · Благодарность НИУ ВШЭ (май 2024)
  • · Почетная грамота Министерства науки и высшего образования Российской Федерации (ноябрь 2022)
  • · Благодарность первого проректора НИУ ВШЭ (август 2022)
  • · Благодарность Факультета компьютерных наук НИУ ВШЭ (август 2018)

Гранты и проекты

  • — · на соискание учёной степени кандидата наук

Идентификаторы исследователя

Публикации (226)

Search for A′→μ+μ− decays

2020 · ARTICLE · en

Searches are performed for both prompt-like and long-lived dark photons, A′, produced in proton-proton collisions at a center-of-mass energy of 13 TeV. These searches look for A′→μ+μ− decays using a data sample corresponding to an integrated luminosity of 5.5/fb collected with the LHCb detector. Neither search finds evidence for a signal, and 90 confidence-level exclusion limits are placed on the γ-A′ kinetic-mixing strength. The prompt-like A′ search explores the mass region from near the dimuon threshold up to 70 GeV, and places the most stringent constraints to date on dark photons with 214m(A′)≲740 MeV and 10.6m(A′)≲30 GeV. The search for long-lived A′→μ+μ− decays places world-leading constraints on low-mass dark photons with lifetimes O(1) ps.

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Observation of new Ξ0c baryons decaying to Λ+cK−

2020 · ARTICLE · en

The Λ+cK− mass spectrum is studied with a data sample of pp collisions at a centre-of-mass energy of 13 TeV corresponding to an integrated luminosity of 5.6 fb−1 collected by the LHCb experiment. Three Ξ0c states are observed with a large significance and their masses and natural widths are measured to be m(Ξc(2923)0)=2923.04±0.25±0.20±0.14 MeV,Γ(Ξc(2923)0)=7.1±0.8±1.8 MeV, m(Ξc(2939)0)=2938.55±0.21±0.17±0.14 MeV,Γ(Ξc(2939)0)=10.2±0.8±1.1 MeV, m(Ξc(2965)0)=2964.88±0.26±0.14±0.14 MeV,Γ(Ξc(2965)0)=14.1±0.9±1.3 MeV, where the uncertainties are statistical, systematic, and due to the limited knowledge of the Λ+c mass. The Ξc(2923)0 and Ξc(2939)0 baryons are new states. The Ξc(2965)0 state is in the vicinity of the known Ξc(2970)0 baryon; however, their masses and natural widths differ significantly.

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Precision measurement of the B+c meson mass

2020 · ARTICLE · en

A precision measurement of the 𝐵+𝑐Bc+ meson mass is performed using proton- proton collision data collected with the LHCb experiment at centre-of-mass energies of 7, 8 and 13 TeV, corresponding to a total integrated luminosity of 9.0 fb−1. The 𝐵+𝑐Bc+ mesons are reconstructed via the decays 𝐵+𝑐Bc+→ J/ψπ+, 𝐵+𝑐Bc+→ J/ψπ+π−π+, 𝐵+𝑐→𝐽/𝜓𝑝𝑝⎯⎯⎯𝜋+Bc+→J/ψpp¯π+, 𝐵+𝑐→𝐽/𝜓𝐷+𝑠Bc+→J/ψDs+, 𝐵+𝑐Bc+→ J/ψ D0K+ and 𝐵+𝑐→𝐵0𝑠𝜋+Bc+→Bs0π+. Combining the results of the individual decay channels, the 𝐵+𝑐Bc+ mass is measured to be 6274.47 ± 0.27 (stat) ± 0.17 (syst) MeV/c2. This is the most precise measurement of the 𝐵+𝑐Bc+ mass to date. The difference between the 𝐵+𝑐Bc+ and 𝐵0𝑠Bs0 meson masses is measured to be 907.75 ± 0.37 (stat) ± 0.27 (syst) MeV/c.

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Measurement of CP-averaged observables in the B0→K∗0μ+μ− decay

2020 · ARTICLE · en

An angular analysis of the B0→K∗0(→K+π−)μ+μ− decay is presented using a data set corresponding to an integrated luminosity of 4.7 fb−1 of pp collision data collected with the LHCb experiment. The full set of CP-averaged observables are determined in bins of the invariant mass squared of the dimuon system. Contamination from decays with the K+π− system in an S-wave configuration is taken into account. The tension seen between the previous LHCb results and the Standard Model predictions persists with the new data. The precise value of the significance of this tension depends on the choice of theory nuisance parameters.

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Search for the rare decays B0s→e+e− and B0→e+e−

2020 · ARTICLE · en

A search for the decays B0s→e+e−Bs0→e+e− and B0→e+e−B0→e+e− is performed using data collected with the LHCb experiment in proton-proton collisions at center-of-mass energies of 77, 88 and 13TeV13TeV, corresponding to integrated luminosities of 11, 22 and 2fb−12fb−1, respectively. No signal is observed. Assuming no contribution from B0→e+e−B0→e+e− decays, an upper limit of (B0s→e+e−)

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Observation of a new baryon state in the Λ0bπ+π− mass spectrum

2020 · ARTICLE · en

A new baryon state is observed in the Λ0bπ+π− mass spectrum with high significance using a data sample of pp collisions, collected with the LHCb detector at centre-of-mass energies s√=7,8 and 13TeV, corresponding to an integrated luminosity of 9fb−1. The mass and natural width of the new state are measured to be m=6072.3±2.9±0.6±0.2MeV,Γ=72±11±2MeV, where the first uncertainty is statistical and the second systematic. The third uncertainty for the mass is due to imprecise knowledge of the Λ0b baryon mass. The new state is consistent with the first radial excitation of the Λ0b baryon, the Λb(2S)0 resonance. Updated measurements of the masses and the upper limits on the natural widths of the previously observed Λb(5912)0 and Λb(5920)0 states are also reported.

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Precision measurement of the 𝛯++𝑐𝑐 mass

2020 · ARTICLE · en

A measurement of the Ξ++cc mass is performed using data collected by the LHCb experiment between 2016 and 2018 in pppp collisions at a centre-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 5.6 fb−1fb−1. The Ξ++cc candidates are reconstructed via the decay modes Ξ++cc→Λ+cK−π+π+ and Ξ++cc→Ξ+cπ+. The result, 3621.55±0.23(stat)±0.30(syst)MeV/c2, is the most precise measurement of the Ξ++cc mass to date.

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Measurement of CP observables in B±→DK± and B±→Dπ± with D→K0SK±π∓ decays

2020 · ARTICLE · en

Measurements of CP observables in B±→DK± and B±→Dπ± decays are presented, where D represents a superposition of D0 and D¯0 states. The D meson is reconstructed in the three-body final state K0SK±π∓. The analysis uses samples of B mesons produced in proton-proton collisions, corresponding to an integrated luminosity of 1.0, 2.0, and 6.0 fb−1 collected with the LHCb detector at centre-of-mass energies of s√= 7, 8, and 13 TeV, respectively. These measurements are the most precise to date, and provide important input for the determination of the CKM angle γ.

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First observation of excited Ω−b states

2020 · ARTICLE · en

We report four narrow peaks in the Ξb0K- mass spectrum obtained using pp collisions at center-of-mass energies of 7, 8, and 13 TeV, corresponding to a total integrated luminosity of 9 fb-1 recorded by the LHCb experiment. Referring to these states by their mass, the mass values are m[Ωb(6316)-]=6315.64±0.31±0.07±0.50 MeV, m[Ωb(6330)-]=6330.30±0.28±0.07±0.50 MeV, m[Ωb(6340)-]=6339.71±0.26±0.05±0.50 MeV, m[Ωb(6350)-]=6349.88±0.35±0.05±0.50 MeV, where the uncertainties are statistical, systematic, and the last is due to the knowledge of the Ξb0 mass. The natural widths of the three lower mass states are consistent with zero, and the 90% confidence-level upper limits are determined to be Γ[Ωb(6316)-]

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Measurement of CP violation in B0→ D∗±D∓ decays

2020 · ARTICLE · en

The decay-time-dependent CP asymmetry in B0→D∗±D∓ decays is measured using a data set corresponding to an integrated luminosity of 9fb−1 recorded by the LHCb detector in proton-proton collisions at centre-of-mass energies of 7, 8 and 13 TeV. The CP parameters are measured as SD∗D=−0.861±0.077(stat)±0.019(syst), ΔSD∗D=0.019±0.075(stat)±0.012(syst), CD∗D=−0.059±0.092(stat)±0.020(syst), ΔCD∗D=−0.031±0.092(stat)±0.016(syst), D∗D=0.008±0.014(stat)±0.006(syst). The analysis provides the most precise single measurement of CP violation in this decay channel to date. All parameters are consistent with their current world average values.

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Курсы (9)