Бодров Денис Алексеевич
Международная лаборатория физики конденсированного состояния
Профессиональные интересы
Должности
- Аспирант — Международная лаборатория физики конденсированного состояния
- Научный сотрудник — Московский институт электроники и математики им. А.Н. Тихонова, Международная лаборатория физики элементарных частиц
Био
- · Начал работать в НИУ ВШЭ в 2020 году.
- · Научно-педагогический стаж: 2 года.
Образование
- 2021 · Магистратура: Московский физико-технический институт (национальный исследовательский университет), специальность «Прикладные математика и физика», квалификация «Магистр»
- 2019 · Бакалавриат: Московский физико-технический институт (государственный университет), специальность «Прикладные математика и физика», квалификация «Бакалавр»
Опыт работы
- · 2021 - н.в.: март : младший научный сотрудник, лаборатория тяжелых кварков и лептонов ФИАН
- · 2020: сентябрь декабрь
- · 2020: : техник, физтех кластер академической и научной карьеры ЛФИ МФТИ
- · 2020 - н.в.: май : стажер-исследователь, международная лаборатория физики элементарных частиц МИЭМ ВШЭ
- · 2020: февраль май
- · 2020: : техник, физтех кластер академической и научной карьеры ЛФИ МФТИ
- · 2018: март декабрь
- · 2020: : техник, лаборатория физики высоких энергий МФТИ
Идентификаторы исследователя
- ResearcherID:
AAH-3024-2021
Публикации (110)
Search for the double-charmonium state with ηc J/ψ at Belle
2023 · ARTICLE · en
We measure the cross section of e+e− → ηcJ/ψ at the Υ(nS)(n = 1–5) on-resonance and 10.52 GeV off-resonance energy points using the full data sample collected by the Belle detector with an integrated luminosity of 955 fb−1. We also search for double charmonium production in e+e− → ηcJ/ψ via initial state radiation near the ηcJ/ψ threshold. No evident signal of the double charmonium state is found, but evidence for the e+e− → ηcJ/ψ process is found with a statistical significance greater than 3.3σ near the ηcJ/ψ threshold. The average cross section near the threshold is measured and upper limits of cross sections are set for other regions.
Measurement of the e+e−→B0sB¯0sX cross section in the energy range from 10.63 to 11.02 GeV using inclusive D±s and D0 production
2023 · ARTICLE · en
We report the first measurement of the inclusive e+e−→bb¯→D±sX and e+e−→bb¯→D0/D¯0X cross sections in the energy range from 10.63 to 11.02. Based on these results, we determine σ(e+e−→B0sB¯0sX) and σ(e+e−→BB¯X) in the same energy range. We measure the fraction of B0s events at Υ(10860) to be fs=(22.0+2.0−2.1)%. We determine also the ratio of the B0s inclusive branching fractions B(B0s→D0/D¯0X)/B(B0s→D±sX)=0.416±0.018±0.092. The results are obtained using the data collected with the Belle detector at the KEKB asymmetric-energy e+e− collider.
First Simultaneous Determination of Inclusive and Exclusive |Vub|
2023 · ARTICLE · en
The first simultaneous determination of the absolute value of the Cabibbo-Kobayashi-Maskawa matrix element Vub using inclusive and exclusive decays is performed with the full Belle data set at the Υ(4S) resonance, corresponding to an integrated luminosity of 711 fb−1. We analyze collision events in which one B meson is fully reconstructed in hadronic modes. This allows for the reconstruction of the hadronic Xu system of the semileptonic b→uℓν¯ℓ decay. We separate exclusive B→πℓν¯ℓ decays from other inclusive B→Xuℓν¯ℓ and backgrounds with a two-dimensional fit, that utilizes the number of charged pions in the Xu system and the four-momentum transfer q2 between the B and Xu system. Combining our measurement with information from lattice QCD and QCD calculations of the inclusive partial rate as well as external experimental information on the shape of the B→πℓν¯ℓ form factor, we determine ∣∣Vexcl.ub∣∣=(3.78±0.23±0.16±0.14)×10−3 and ∣∣Vincl.ub∣∣=(3.88±0.20±0.31±0.09)×10−3, respectively, with the uncertainties being the statistical error, systematic errors, and theory errors. The ratio of ∣∣Vexcl.ub∣∣/∣∣Vincl.ub∣∣=0.97±0.12 is compatible with unity.
Search for the Lepton Flavor Violating Decays B+ → K+τ±ℓ∓ (ℓ=e,μ) at Belle
2023 · ARTICLE · en
We present a search for the lepton-flavour-violating decays B+→K+τ±ℓ∓, with ℓ=(e,μ), using the full data sample of 772×106 BB¯¯¯¯ pairs recorded by the Belle detector at the KEKB asymmetric-energy e+e− collider. We use events in which one B meson is fully reconstructed in a hadronic decay mode. We find no evidence for B±→K±τℓ decays and set upper limits on their branching fractions at the 90% confidence level in the (1-3)×10−5 range. The obtained limits are the world's best results.
Search for Bs0 → ℓ∓τ± with the Semi-leptonic Tagging Method at Belle
2023 · ARTICLE · en
We present a search for the lepton-flavor-violating decays B0s→ℓ∓τ±, where ℓ=e,μ, using the full data sample of 121 fb−1 collected at the Υ(5S) resonance with the Belle detector at the KEKB asymmetric-energy e+e− collider. We use B0sB¯¯¯¯0s events in which one B0s meson is reconstructed in a semileptonic decay mode and the other in the signal mode. We find no evidence for B0s→ℓ∓τ± decays and set upper limits on their branching fractions at 90% confidence level as B(B0s→e∓τ±)
Study of the lineshape of X(3872) using B decays to D0D*0K
2023 · ARTICLE · en
We present a study of the X(3872) lineshape in the decay B→X(3872)K→D0¯D*0K using a data sample of 772×106 B¯B pairs collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e− collider. The peak near the threshold in the D0¯D*0 invariant mass spectrum is fitted using a relativistic Breit-Wigner lineshape. We determine the mass and width parameters to be mBW=3873.71+0.56−0.50(stat)±0.13(syst) MeV/c2 and ΓBW=5.2+2.2−1.5(stat)±0.4(syst) MeV, respectively. The branching fraction is found to be B(B+→X(3872)K+)×B(X(3872)→D0¯D*0)=(0.97+0.21−0.18(stat)±0.10(syst))×10−4. The signal from B0 decays is observed for the first time with 5.2σ significance, and the ratio of branching fractions between charged and neutral B decays is measured to be B(B0→X(3872)K0)/B(B+→X(3872)K+)=1.34+0.47−0.40(stat)+0.10−0.12(syst). The peak is also studied using a Flatté lineshape. We determine the lower limit on the D¯D∗ coupling constant g to be 0.075 at 95% credibility in the parameter region where the ratio of g to the mass difference from the D0¯D*0 threshold is equal to −15.11 GeV−1, as measured by LHCb.
First measurement of the Q2 distribution of X(3915) single-tag two-photon production
2023 · ARTICLE · en
We report the first measurement of the Q2 distribution of X(3915) produced by single-tag two-photon interactions. The decay mode used is X(3915)→J/ψω. The covered Q2 region is from 1.5 (GeV/c)2 to 10.0 (GeV/c)2. We observe 7.9±3.1(stat.)±1.5(syst.) events, where we expect 4.1±0.7 events based on the Q2=0 result from the no-tag two-photon process, extrapolated to higher Q2 region using the cc¯ model of Schuler, Berends, and van Gulik. The shape of the distribution is also consistent with this model; we note that statistical uncertainties are large.
Evidence of B0 → pΣ−π− at Belle
2023 · ARTICLE · en
We search for the B0→p¯Σ0π− decay with ¯Σ0→¯Λγ, where the γ is not measured, using a data sample corresponding to an integrated luminosity of 711 fb−1 which contains 772×106 B¯B pairs, collected around the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e− collider. We measure for the first time the B0→p¯Σ0π− branching fraction to be B(B0→p¯Σ0π−)=(1.17+0.43−0.40(stat)±0.07(syst))×10−6 with a significance of 3.0σ. We simultaneously measure the branching fraction for the related channel B0→p¯Λπ− with much improved precision.
Measurement of branching fractions and decay asymmetry parameters for Λc+ → Λh+ and Λc+ → Σ0h+ (h=K,π), and search for CP violation in baryon decays
2023 · ARTICLE · en
We report a study of Λ+c→Λh+ and Λ+c→Σ0h+ (h=K,π) decays based on a data sample of 980~fb−1 collected with the Belle detector at the KEKB energy-asymmetric e+e− collider. The first results of direct CP asymmetry in two-body singly Cabibbo-suppressed (SCS) decays of charmed baryons are measured, AdirCP(Λ+c→ΛK+)=+0.021±0.026±0.001 and AdirCP(Λ+c→Σ0K+)=+0.025±0.054±0.004. We also make the most precise measurement of the decay asymmetry parameters (α) for the four modes of interest and search for CP violation via the α-induced CP asymmetry (AαCP). We measure AαCP(Λ+c→ΛK+)=−0.023±0.086±0.071 and AαCP(Λ+c→Σ0K+)=+0.08±0.35±0.14, which are the first AαCP results for SCS decays of charmed baryons. We search for Λ-hyperon CP violation in Λ+c→(Λ,Σ0)π+ and find AαCP(Λ→pπ−)=+0.013±0.007±0.011. This is the first time that hyperon CP violation has been measured via Cabibbo-favored charm decays. No evidence of baryon CP violation is found. We also obtain the most precise branching fractions for two SCS Λ+c decays, B(Λ+c→ΛK+)=(6.57±0.17±0.11±0.35)×10−4 and B(Λ+c→Σ0K+)=(3.58±0.19±0.06±0.19)×10−4. The first uncertainties are statistical and the second systematic, while the third uncertainties come from the uncertainties on the world average branching fractions of Λ+c→(Λ,Σ0)π+.
Study of B0-bar -> D+ h- (h = K/pi) decays at Belle
2022 · ARTICLE · en
We present a measurement of the branching fractions of the Cabibbo favored B0 → D+π- and the Cabibbo suppressed B0 → D+K- decays. We find Br(B0 → D+π-)=(2.48±0.01±0.09±0.04)×10-3 and Br(B0 → D+K−)=(2.03±0.05±0.07±0.03)×10-4 decays, where the first uncertainty is statistical, the second is systematic, and the third uncertainty is due to the D+ → K-π+π+ branching fraction. The ratio of branching fractions of B0→D+K- and B0→D+π- is measured to be RD=[8.19±0.20(stat)±0.23(syst)]×10-2. These measurements are performed using the full Belle dataset, which corresponds to 772×106 BB pairs and use the Belle II software framework for data analysis.
Курсы (1)
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Основы современной физики: атомная и ядерная физика
2021/2022 · Бакалавриат · рус