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)
First search for the weak radiative decays Λc+ → Σ+γ and Ξc0 → Ξ0 γ
2023 · ARTICLE · en
We present the first search for the weak radiative decays A+c -> E+gamma and E0 c -> 80 gamma using a data sample of 980 fb-1 collected by the Belle detector operating at the KEKB asymmetric-energy e+e- collider. There are no evident A+c -> E+gamma or 80c -> E0 gamma signals. Taking the decays A+c -> pK-x-+ and E0c -> Z-1-x-+ as normalization channels, the upper limits at 90% credibility level on the ratios of branching fractions B(A+c -> E+gamma)=B(A+c -> pK-x-+) 80 gamma)=B(80c -> Z-1-x-+) E+gamma) E0 gamma)
Measurement of the branching fractions for Cabibbo-suppressed decays D+ → K+K−π+π0 and D(s)+ → K+π−π+π0 at Belle
2023 · ARTICLE · en
We present measurements of the branching fractions for the singly Cabibbo-suppressed decays D+ -K+K-x-+x-0 and D+s -K+x--x-+x-0, and the doubly Cabibbo-suppressed decay D+ -K+x--x-+x-0, based on 980 fb-1 of data recorded by the Belle experiment at the KEKB e+e- collider. We measure these modes relative to the Cabibbo-favored modes D+ -K-x-+x-+x-0 and D+s -K+K-x-+x-0. Our results for the ratios of branching fractions are B(D+ -K+K-x-+x-0)/B(D+ -K-x-+x-+x-0) = (11.32 +/- 0.13 +/- 0.26)%, B(D+ -K+x--x-+x-0)/B(D+ -K-x-+x-+x-0) = (1.68 +/- 0.11 +/- 0.03)%, and B(D+s -K+x--x-+x-0)/ B(D+s -K+K-x-+x-0) = (17.13 +/- 0.62 +/- 0.51)%, where the uncertainties are statistical and systematic, respectively. The second value corresponds to (5.83 +/- 0.42) x tan4 BC, where BC is the Cabibbo angle; this value is larger than other measured ratios of branching fractions for a doubly Cabibbo-suppressed charm decay to a Cabibbo-favored decay. Multiplying these results by world average values for B(D+ -K-x-+x-+x-0) and B(D+s -K+K-x-+x-0) yields B(D+ -K+K-x-+x-0) = (7.08 +/- 0.08 +/- 0.16 +/- 0.20) x 10-3, B(D+ -K+x--x-+x-0) = (1.05 +/- 0.07 +/- 0.02 +/- 0.03) x 10-3, and B(D+s -K+x--x-+x-0) = (9.44 +/- 0.34 +/- 0.28 +/- 0.32) x 10-3, where the third uncertainty is due to the branching fraction of the normalization mode. The first two results are consistent with, but more precise than, the current world averages. The last result is the first measurement of this branching fraction.
Measurements of branching fractions of Λc+ → Σ+η and Λc+ → Σ+η' and asymmetry parameters of Λc+ → Σ+π0, Λc+ → Σ+η, and Λc+ → Σ+ η'
2023 · ARTICLE · en
We report a study of A+c , E+pi 0, A+c , E+eta, and A+c , E+ eta i using the data sample corresponding to an integrated luminosity of 980 fb-1 collected with the Belle detector at the KEKB asymmetric-energy e+e- collider. The branching fractions relative to A+c , E+pi 0 are measured as BA+c,E+eta=BA+c,E+pi 0 = 0.25 +/- 0.03 +/- 0.01 and BA+c,E+eta i=BA+c,E+pi 0 = 0.33 +/- 0.06 +/- 0.02. Using BA+c,E+pi 0 = (1.25 +/- 0.10)%, we obtain BA+c,E+eta = (3.14 +/- 0.35 +/- 0.17 +/- 0.25) x 10-3 and BA+c,E+eta i = (4.16 +/- 0.75 +/- 0.25 +/- 0.33) x 10-3. Here the uncertainties are statistical, systematic, and from BA+c,E+pi 0, respectively. The ratio of the branching fraction of A+c , E+eta i with respect to that of A+c , E+eta is measured to be BA+c,E+eta i=BA+c,E+eta = 1.34 +/- 0.28 +/- 0.08. We update the asymmetry parameter of A+c , E+pi 0, alpha E+pi 0 = -0.48 +/- 0.02 +/- 0.02, with a considerably improved precision. The asymmetry parameters of A+c , E+eta and A+c , E+eta i are measured to be alpha E+eta = -0.99 +/- 0.03 +/- 0.05 and alpha E+eta i = -0.46 +/- 0.06 +/- 0.03 for the first time.
Measurement of branching fractions of Λc+ → p K0S K0S and Λc+ → p K0S η at Belle
2023 · ARTICLE · en
We present a study of a singly Cabibbo-suppressed decay A+c -pK0SK0S and a Cabibbo-favored decay A+c -pK0St7 based on 980 fb-1 of data collected by the Belle detector, operating at the KEKB energy-asymmetric e+e- collider. We measure their branching fractions relative to A+c -pK0S: B(A+c -pK0SK0S)=B(A+c -pK0S) = (1.48 +/- 0.08 +/- 0.04) x 10-2 and B(A+c -pK0St7)=B(A+c -pK0S) = (2.73 +/- 0.06 +/- 0.13) x 10-1. Combining with the world average B(A+c -pK0S), we have the absolute branching fractions, B(A+c -pK0SK0S) = (2.35 +/- 0.12 +/- 0.07 +/- 0.12) x 10-4 and B(A+c -pK0St7) = (4.35 +/- 0.10 +/- 0.20 +/- 0.22) x 10-3. The first and second uncertainties are statistical and systematic, respectively, while the third ones arise from the uncertainty on B(A+c -pK0S). The mode A+c -pK0 SK0S is observed for the first time and has a statistical significance of > 10 sigma. The branching fraction of A+c -pK0St7 has been measured with a threefold improvement in precision over previous results and is found to be consistent with the world average.
Measurement of the branching fraction of Ξc0→ Λc+π− at Belle
2023 · ARTICLE · en
Based on a data sample of 983 fb-1 collected with the Belle detector at the KEKB asymmetric-energy e+e- collider, we present the study of the heavy-flavor-conserving decay 80c -> A+c x-- with A+c reconstructed via its pK-x-+ decay mode. The branching fraction ratio B(80c -> A+c x--)=B(80c -> 8-x-+) is measured to be 0.38 +/- 0.04 +/- 0.04. Combining with the world average value of B(80c -> 8-x-+), the branching fraction B(80c -> A+c x--) is deduced to be (0.54 +/- 0.05 +/- 0.05 +/- 0.12)%. Here, the uncertainties above are statistical, systematic, and from B(80c -> 8-x-+), respectively.
Search for rare decays B+ → Ds*+η, Ds*+K0, D+η, and D+K0
2023 · ARTICLE · en
We present a study of rare decay modes B+->. D(s)(+)h(0), B+-> D-s(*)+h(0) and B+ -> D(+)h(0), where h(0) denotes the neutral meson eta or K-0, using a data sample of (772 +/- 10) x 10(6) B (B) over bar events produced at the.(sic) (4S) resonance. The data were collected by the Belle detector operating at the asymmetric-energy KEKB collider. We find no evidence for these decays, so we set upper limits at the 90% confidence level on the branching fractions of B+ -> D(s)(+)h(0), D(s)(*)(+)h(0), and D(+)h(0) decay modes. Along with these rare decay modes, we report improved measurements of the color-suppressed decay branching fractions B((B) over bar (0)->. D-0 eta) = (26.6 +/- 1.2 +/- 2.1) x 10(-5) and B((B) over bar (0) -> D-0(K) over bar (0)) = (5.6 +/- 0.5 +/- 0.2) x 10(-5). The first and second quoted uncertainties are statistical and systematic, respectively.
Measurement of the mass and width of the Λc(2625)+ charmed baryon and the branching ratios of Λc(2625)+ → Σc0π+ and Λc(2625)+ → Σc++π−
2023 · ARTICLE · en
Using the entire data sample of 980 fb(-1) collected at or near the gamma(4S) resonance with the Belle detector operating at the KEKB asymmetric-energy e(+)e(-) collider, we report the measurement of the mass, width, and the branching ratios of the Lambda(c) (2625)(+) charmed baryon. The mass difference between Lambda(c)(2625)(+) and Lambda(+)(c) is measured to be M(Lambda(c)(2625)(+)) - M(Lambda(+)(c)) = 341.518 +/- 0.006 +/- 0.049 MeV/c(2). The upper limit on the width is measured to be Gamma(Lambda(c)(2625)(+)) Lambda(+)(c)pi(+)pi(-) are measured to be B(Lambda(c) (2625)(+)->Sigma(0)(c)pi(+))/B(Lambda(c) (2625)(+)-> Lambda(+)(c) pi(+)pi(-)) = (5.19 +/- 0.23 +/- 0.40)% and B(Lambda(c) (2625)(+)->Sigma(++)(c)pi(-))/B(Lambda(c) (2625)(+)-> Lambda(+)(c) pi(+)pi(-)) = (5.13 +/- 0.26 +/- 0.32)% where the first and second uncertainties are statistical and systematic, respectively. These measurements can be used to further constrain the parameters of the underlying theoretical models.
Measurement of the B+/B0 production ratio in e+e− collisions at the ϒ(4S) resonance using B → J/ψ(ℓℓ)K decays at Belle
2023 · ARTICLE · en
We measure the ratio of branching fractions for the gamma(4S) decays to B+/B- and B-0(B) over barB(0) using B+ -> J/psi(ll)K+ and B-0 -> J/psi(ll)K-0 samples, where J/psi(ll) stands for J/psi -> l(+)l(-) (l = e or mu), with 711 fb(-1) of data collected at the gamma(4S) resonance with the Belle detector. We find the decay rate ratio of gamma(4S) -> B-0(B) over barB(0) over gamma(4S) -> B-0(B) over barB(0) to be 1.065 +/- 0.012 +/- 0.019 +/- 0.047, which is the most precise measurement to date. The first and second uncertainties are statistical and systematic, respectively, and the third uncertainty is due to the assumption of isospin symmetry in B -> J/psi(ll)K.
Measurement of the branching fraction and search for CP violation in D0 → KS0KS0π+π− decays at Belle
2023 · ARTICLE · en
We measure the branching fraction for the Cabibbo-suppressed decay D0 -> K0SK0S pi+pi- and search for CP violation via a measurement of the CP asymmetry ACP as well as the T-odd triple-product asymmetry aTCP. We use 922 fb-1 of data recorded by the Belle experiment, which ran at the KEKB asymmetric-energy e+e- collider. The branching fraction is measured relative to the Cabibbo-favored normalization channel D0 -> K0S pi+pi-; the result is B(D0 -> K0SK0S pi+pi-)=[4.79 +/- 0.08(stat)+/- 0.10(syst)+/- 0.31(norm)]x10-4, where the first uncertainty is statistical, the second is systematic, and the third is from uncertainty in the normalization channel. We also measure ACP=[-2.51 +/- 1.44(stat)+0.11-0.10(syst)]%, and aTCP=[-1.95 +/- 1.42(stat)+0.14-0.12(syst)]%. These results show no evidence of CP violation.
Search for X(3872)→π+π−π0 at Belle
2023 · ARTICLE · en
We present a search for the decay X(3872)-> pi(+)pi(-) pi(0) in the (772 +/- 11 ) 10(6) gamma (4S) -> B B-bar data sample collected at the Belle detector, where the X(3872) thorn is produced in B +/- -> (KX)-X-+/-(3872) and B-0 -> (KSX)-X-0(3872) decays. We do not observe a signal, and set 90% credible upper limits for two different models of the decay processes: if the decay products are distributed uniformly in phase space, B(X(3872) -> pi(+)pi(-)pi(0) ) (0) pair in the process X(3872) -> D-0 over bar (D) over bar (0) thorn c:c: -> D-0 (D) over bar (0)pi(0) -> pi(+)pi(-) pi(0), B(X(3872) -> pi(+) pi(-) pi(0) )
Курсы (1)
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Основы современной физики: атомная и ядерная физика
2021/2022 · Бакалавриат · рус