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)
Measurement of the CP asymmetry in D+→π+π0 decays at Belle II
2025 в печати · ARTICLE · en
We measure the CP asymmetry in D+→π+π0 decays reconstructed in e+e− collisions at the Belle II experiment using a data set corresponding to an integrated luminosity of 428 fb−1. A control sample of D+→π+KS decays is used to correct for detection and production asymmetries. The result, ACP(D+→π+π0)=(−1.8±0.9±0.1)%, where the first uncertainty is statistical and the second systematic, is the most precise determination to date. It agrees with the prediction of CP symmetry from the standard model, and with results of previous measurements.
Measurement of the time-integrated CP asymmetry in D0→π0π0 decays at Belle II
2025 в печати · ARTICLE · en
We measure the time-integrated CP asymmetry, ACP, in D0→π0π0 decays reconstructed in e+e−→cc¯ events collected by Belle II during 2019--2022. The data corresponds to an integrated luminosity of 428fb−1. The D0 decays are required to originate from the flavor-conserving D∗+→D0π+ decay to determine the charm flavor at production time. Control samples of D0→K−π+ decays, with or without an associated pion from a D∗+ decay, are used to correct for detection asymmetries. The result, ACP(D0→π0π0)=(0.30±0.72±0.20)%, where the first uncertainty is statistical and the second systematic, is consistent with CP symmetry.
Search for Pcs(4459) and Pcs(4338) in Upsilon(1S,2S) inclusive decays at Belle
2025 в печати · ARTICLE · en
Using data samples of 102 million Upsilon(1S) events and 158 million Upsilon(2S) events collected by the Belle detector at the KEKB asymmetric-energy e+e− collider, we search for [udsccbar] pentaquark states decaying to Jpsi Lambda. Using the first observations of Upsilon(1S, 2S) inclusive decays to Jpsi Lambda, we find evidence of the P_ccbars(4459)0 state with a local significance of 3.3 standard deviations, including statistical and systematic uncertainties. We measure the mass and width of the Pccbars(4459)0 to be (4471.7 +- 4.8 +- 0.6) MeV/c2 and (21.9 +- 13.1 +- 2.7) MeV, respectively. The branching fractions for P_ccbars(4459)0 production are measured to be B[Upsilon(1S) -> P_ccbars(4459)0/ Pbar_ccbars(4459)0 + anything] = (3.5 +- 2.0 +- 0.2)*10-6 and B[Upsilin(2S) -> P_ccbars(4459)0/ Pbar_ccbars(4459)0 +anything] = (2.9 +- 1.7 +- 0.4)*10-6. The inclusive branching fractions of Upsilon(1S, 2S) -> Jpsi Lambda/Lambdabar are measured to be B[Upsilin(1S) -> Jpsi Lambda/Lambdabar + anything] = (36.9 +- 5.3 +- 2.4)*10-6 and B[Upsilon(2S) -> Jpsi Lambda/Lambdabar + anything] = (22.3 +- 5.7 +- 3.1)*10-6. We measure the visible cross section σ(e+e−→J/psiΛ/Λ¯ + anything) = (90 +- 14 +- 6) fb for the continuum production at s√=10.52 GeV. In all cases, the first uncertainties are statistical and the second are systematic.
Measurement of the branching fraction, polarization, and time-dependent CP asymmetry in B0→ρ+ρ− decays and constraint on the CKM angle phi
2025 в печати · ARTICLE · en
We present a measurement of the branching fraction and fraction of longitudinal polarization of B0→ρ+ρ− decays, which have two π0's in the final state. We also measure time-dependent {\it CP} violation parameters for decays into longitudinally polarized ρ+ρ− pairs. This analysis is based on a data sample containing (387±6)×106 Υ(4S) mesons collected with the Belle~II detector at the SuperKEKB asymmetric-energy e+e− collider in 2019-2022. We obtain (B0→ρ+ρ−)=(2.89+0.23−0.22+0.29−0.27)×10−5,fL=0.921+0.024−0.025+0.017−0.015, \mbox{S=−0.26±0.19±0.08}, and C=−0.02±0.12+0.06−0.05, where the first uncertainties are statistical and the second are systematic. We use these results to perform an isospin analysis to constrain the CKM angle ϕ2 and obtain two solutions; the result consistent with other Standard Model constraints is ϕ2=(92.6+4.5−4.7)∘.
Measurement of the branching fraction and CP-violating asymmetry of the decay B0→π0π0 using 387 million bottom-antibottom meson pairs in Belle II data
2025 в печати · ARTICLE · en
We measure the branching fraction and CP-violating flavor-dependent rate asymmetry of B0→π0π0 decays reconstructed using the Belle II detector in an electron-positron collision sample containing 387×106 BB⎯⎯⎯⎯ pairs. Using an optimized event selection, we find 126±20 signal decays in a fit to background-discriminating and flavor-sensitive distributions. The resulting branching fraction is (1.25±0.23)×10−6 and the CP-violating asymmetry is 0.03±0.30.
Model-independent measurement of D0-D0 mixing parameters in D0→K0Sπ+π− decays at Belle and Belle II
2025 в печати · ARTICLE · en
We perform a model-independent measurement of the D0-D⎯⎯⎯⎯0 mixing parameters using samples of e+e−-collision data collected by the Belle and Belle II experiments that have integrated luminosities of 951 fb−1 and 408 fb−1, respectively. Approximately 2.05×106 neutral Dmesons are reconstructed in the D0→K0Sπ+π− channel, with the neutral D flavor tagged by the charge of the pion in the D∗+→D0π+decay. Assuming charge-parity symmetry, the mixing parameters are measured to be x=(4.0±1.7±0.4)×10−3 and y=(2.9±1.4±0.3)×10−3, where the first uncertainties are statistical and the second systematic. The results are consistent with previous determinations.
Measurement of branching fractions, CP asymmetry, and isospin asymmetry for B→ργ decays using Belle and Belle II data
2025 в печати · ARTICLE · en
We present measurements of B+→ρ+γ and B0→ρ0γ decays using a combined data sample of 772×106 BB⎯⎯⎯⎯ pairs collected by the Belle experiment and 387×106 BB⎯⎯⎯⎯ pairs collected by the Belle II experiment in e+e− collisions at the Υ(4S) resonance. After an optimized selection, a simultaneous fit to the Belle and Belle II data sets yields 114±12 B+→ρ+γ and 99±12 B0→ρ0γ decays. The measured branching fractions are (13.1+2.0+1.3−1.9−1.2)×10−7 and (7.5±1.3+1.0−0.8)×10−7 for B+→ρ+γ and B0→ρ0γ decays, respectively, where the first uncertainty is statistical and the second is systematic. We also measure the isospin asymmetry AI(B→ργ)=(10.9+11.2+7.8−11.7−7.3)% and the direct CP asymmetry ACP(B+→ρ+γ)=(−8.2±15.2+1.6−1.2)%.
Observation of the decays B+→Σc(2455)++Ξc and B0→Σc(2455)0Ξ0c
2025 в печати · ARTICLE · en
We report the first observation of the two-body baryonic decays B+→Σc(2455)++Ξ⎯⎯⎯⎯−c and B0→Σc(2455)0Ξ⎯⎯⎯⎯0c with significances of 7.3σand 6.2σ, respectively, including statistical and systematic uncertainties. The branching fractions are measured to be (B+→Σc(2455)++Ξ⎯⎯⎯⎯−c)=(5.74±1.11±0.42+2.47−1.53)×10−4 and (B0→Σc(2455)0Ξ⎯⎯⎯⎯0c)=(4.83±1.12±0.37+0.72−0.60)×10−4. The first and second uncertainties are statistical and systematic, respectively, while the third ones arise from the absolute branching fractions of Ξ⎯⎯⎯⎯−c or Ξ⎯⎯⎯⎯0c decays. The data samples used for this analysis have integrated luminosities of 711~fb−1 and 365~fb−1, and were collected at the Υ(4S) resonance by the Belle and Belle~II detectors operating at the KEKB and SuperKEKB asymmetric-energy e+e− colliders, respectively.
Search for lepton flavor-violating decay modes B0 → K*0τ±ℓ∓ (ℓ = e, μ) with hadronic B-tagging at Belle and Belle II
2025 в печати · ARTICLE · en
We present the results of a search for the charged-lepton-flavor violating decays B0 → K*0τ±ℓ∓, where ℓ∓ is either an electron or a muon. The results are based on 365 fb−1 and 711 fb−1 datasets collected with the Belle II and Belle detectors, respectively. We use an exclusive hadronic B-tagging technique, and search for a signal decay in the system recoiling against a fully reconstructed B meson. We find no evidence for B0 → K*0τ±ℓ∓ decays and set upper limits on the branching fractions in the range of (2.9–6.4)×10−5 at 90% confidence level.
Search for lepton-flavor-violating τ−→ℓ−K0s decays at Belle and Belle II
2025 в печати · ARTICLE · en
We present the results of a search for charged-lepton-flavor violating decays τ−→ℓ−K0S, where ℓ− is either an electron or a muon. We combine e+e− data samples recorded by the Belle II experiment at the SuperKEKB collider (428 fb−1) with samples recorded by the Belle experiment at the KEKB collider (980 fb−1) to obtain a sample of 1.3 billion e+e−→τ+τ− events. We observe 0 and 1 events and set 90% confidence level upper limits of 0.8×10−8 and 1.2×10−8 on the branching fractions of the decay modes τ−→e−K0S and τ−→μ−K0S, respectively. These are the most stringent upper limits to date.
Курсы (1)
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Основы современной физики: атомная и ядерная физика
2021/2022 · Бакалавриат · рус