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)
Measurements of the branching fractions of Ξ0c→ΛK0S, Ξ0c→Σ0K0S, and Ξ0c→Σ+K- decays at Belle
2022 · ARTICLE · en
Using the entire data sample of 980 fb−1 collected with the Belle detector at the KEKB asymmetric-energy e+e− collider, we present measurements of the branching fractions of the Cabibbo-favored decays Ξ0c→ΛK0S, Ξ0c→Σ0K0S, and Ξ0c→Σ+K−. Taking the decay Ξ0c→Ξ−π+ as the normalization mode, we measure the branching fraction ratio B(Ξ0c→ΛK0S)/B(Ξ0c→Ξ−π+)=0.229±0.008±0.012 with improved precision, and measure the branching fraction ratios B(Ξ0c→Σ0K0S)/B(Ξ0c→Ξ−π+)=0.038±0.006±0.004 and B(Ξ0c→Σ+K−)/B(Ξ0c→Ξ−π+)=0.123±0.007±0.010 for the first time. Taking into account the branching fraction of the normalization mode, the absolute branching fractions are determined to be B(Ξ0c→ΛK0S)=(3.27±0.11±0.17±0.73)×10−3, B(Ξ0c→Σ0K0S)=(0.54±0.09±0.06±0.12)×10−3, and B(Ξ0c→Σ+K−)=(1.76±0.10±0.14±0.39)×10−3. The first and second uncertainties above are statistical and systematic, respectively, while the third ones arise from the uncertainty of the branching fraction of Ξ0c→Ξ−π+.
Search for Z' -> mu(+)mu(-) in the L-mu - L-tau gauge-symmetric model at Belle
2022 в печати · ARTICLE · en
Теории, выходящие за рамки Стандартной модели, часто предсказывают существование дополнительного нейтрального бозона Z′. Используя данные, собранные в ходе эксперимента Belle II в 2018 году на коллайдере SuperKEKB, мы проводим первые поиски невидимого распада Z′ в процессе e+ e- --> mu+ mu- Z′ и лептонного распада Z′, нарушающего аромат в e+ e- --> e+- mu-+ Z′. Мы не обнаружили превышения событий и устанавили верхние пределы на 90% уровня правдоподобия для сечений этих процессов. Мы переводим первое в рамках теории L_mu - L_tau в верхние пределы на константы связи Z′ на уровне 5 * 10^{-2} -- 1 M_{Z′}
Search for the radiative penguin decays B0→K0SK0Sγ in the Belle experiment
2022 · ARTICLE · en
We report results from the first search for the rare penguin-dominated decay mode B-0 -> (KSKS0)-K-0 gamma, which can result from the production of tensor mesons f(1270) and f'(1525) in association with a photon. The search uses the full data sample of 772 x 10(6) BB-bar pairs collected with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. No statistically significant signals are observed in the (KSKS0)-K-0 invariant mass range 1 GeV/c(2) (KSKS0)-K-0 gamma) f (2)gamma) x B(f(2) (1270) -> (KSKS0)-K-0) f(2 gamma)') x B(f(2)'(1525) -> (KSKS0)-K-0) (KSKS0)-K-0 gamma branching fraction in bins of M (KS0KS0).
Search for charged lepton flavor violating decays of Upsilon(1S)
2022 в печати · ARTICLE · en
We present a search for the charged lepton-flavor-violating decays Upsilon(1S) -> l(+/-)l'(-/+) and radiative charged lepton-flavour-violating decays Upsilon(1S) -> gamma l(+/-)l'(-/+) [l, l' = e, mu, tau] using the 158 million Upsilon(2S) sample collected by the Belle detector at the KEKB collider. This search uses Upsilon(1S) mesons produced in Upsilon(2S) -> pi(+)pi(-)Upsilon(1S) transitions. We do not find any significant signal, so we provide upper limits on the branching fractions at the 90% confidence level.
First test of lepton flavor universality in the charmed baryon decays Omega(0)(c) -> Omega(-)l(+)nu(l) using data of the Belle experiment
2022 · ARTICLE · en
We present the first observation of the Omega(0)(c) -> Omega(-)mu(+)nu(mu) decay and present measurements of the branching fraction ratios of the Omega(0)(c) -> Omega(-)l(+)nu(l) decays compared to the reference mode Omega(0)(c) -> Omega(-)pi(+), (l = e or mu). This analysis is based on 89.5 fb(-1), 711 fb(-1), and 121.1 fb(-1) data samples collected with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider at the center-of-mass energies of 10.52 GeV, 10.58 GeV, and 10.86 GeV, respectively. The Omega(0)(c) signal yields are extracted by fitting M-Omega l' and M-Omega pi spectra. The branching fraction ratios B(Omega(0)(c) -> Omega(-)e(+)nu(e))/B(Omega(0)(c) -> Omega(-)pi(+)) and B(Omega(0)(c) -> Omega(-)mu(+)nu(mu))/B(Omega(0)(c) -> Omega(-)pi(+)) are measured to be 1.98 +/- 0.13(stat) +/- 0.08(syst) and 1.94 +/- 0.18(stat) +/- 0.10(syst), respectively. The ratio of B(Omega(0)(c) -> Omega(-)e(+)nu(e))/B(Omega c0 -> Omega(-)mu(+)nu(mu)) is measured to be 1.02 +/- 0.10(stat) +/- 0.02(syst), which is consistent with the expectation of lepton flavor universality.
Measurement of the Michel Parameter ξ' of the Leptonic τ-Decay at the Future Super Charm-Tau Factory
2021 · ARTICLE · en
A method is suggested that allows the first measurement of the polarization of muons from tau-lepton decays at the Super charm-tau Factory. To measure the polarization, it is proposed to use muons decayed in flight in the drift chamber of the detector, when both tracks, mother and daughter, were reconstructed by the reconstruction program. The method is based on the correlation between the muon spin and daughter electron momentum. We used a Monte Carlo simulation with the Super charm-tau Factory detector parameters to estimate the number of decayed-in-flight muons. Possible background processes were studied and methods for their suppression were proposed. The expected statistical uncertainty for muon polarization measurement is about 2%.
Measurement of the Michel Parameter ξ′ in Tau-Lepton Decays at the Super Charm-Tau Factory
2021 · ARTICLE · en
In this paper, we present a feasibility study of the first measurement of the longitudinal polarization of a muon from the tau-lepton decay to extract the Michel parameter xi' at the future Super Charm-Tau Factory (SCTF). The expected number of muon decays events on the full SCTF data was estimated, possible background processes were studied, and methods of their suppression were suggested. Statistical accuracy was estimated to be 0.02, which enables a new verification of the Standard Model at high precision level.
Measurement of the branching fraction of Λc+→pω decay at Belle
2021 · ARTICLE · en
Using 980.6 /fb of data collected with the Belle detector operating at the KEKB asymmetric-energy e+e- collider, we present a measurement of the branching fraction of the singly Cabibbo-suppressed decay Λс+ → pω. A clear Λс+ signal is observed for Λс+ → pω with a statistical significance of 9.1 standard deviations, and we measure the ratio of branching fractions B(Λс+ → pω)/B(Λс+ → pK-π+)=(1.32±0.12(stat)±0.10(syst))×10-2, from which we infer the branching fraction B(Λс+ → pω)=(8.27±0.75(stat)±0.62(syst)±0.42(ref))×10-4. The first quoted uncertainty is statistical, the second systematic, and the third from the reference mode Λс+ → pK-π+.
Precise Measurement of the D0 and D+ Lifetimes at Belle II
2021 · ARTICLE · en
We report a measurement of the D-0 and D+ lifetimes using D-0 -> K-pi(+) and D+ -> K-pi(+)pi(+) decays reconstructed in e(+)e(-) -> c (c) over bar data recorded by the Belle II experiment at the SuperKEKB asymmetric-energy e(+)e(-) collider. The data, collected at center-of-mass energies at or near the (sic)(4S) resonance, correspond to an integrated luminosity of 72 fb(-1). The results, (tau)(D-0) = 410.5 +/- 1.1 (stat) +/- 0.8(syst) fs and tau(D-0) = 1030.4 +/- 4.7 (stat) +/- 3.1 (syst) fs, are the most precise to date and are consistent with previous determinations.
Measurements of q(2) moments of inclusive B -> X(c)l(+)upsilon(l) decays with hadronic tagging
2021 · ARTICLE · en
We present the measurement of the first to fourth order moments of the four-momentum transfer squared, q(2), of inclusive B -> X(c)l(+)upsilon(l) decays using the full Belle dataset of 711 fb(-1) of integrated luminosity at the gamma(4S) resonance where l = e, mu. The determination of these moments and their systematic uncertainties open new pathways to determine the absolute value of the Cabibbo-Kobayashi-Maskawa matrix element V (cb) using a reduced set of matrix elements of the heavy quark expansion. In order to identify and reconstruct the X-c system, we reconstruct one of the two B-mesons using machine learning techniques in fully hadronic decay modes. The moments are measured with progressively increasing threshold selections on q(2) starting with a lower value of 3.0 GeV2 in steps of 0.5 GeV2 up to a value of 10.0 GeV2. The measured moments are further unfolded, correcting for reconstruction and selection effects as well as QED final state radiation. We report the moments separately for electron and muon final states and observe no lepton flavor universality violating effects.
Курсы (1)
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Основы современной физики: атомная и ядерная физика
2021/2022 · Бакалавриат · рус