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)
STCF conceptual design report (Volume 1): Physics & detector
2024 в печати · ARTICLE · en
The super τ-charm facility (STCF) is an electron–positron collider proposed by the Chinese particle physics community. It is designed to operate in a center-of-mass energy range from 2 to 7 GeV with a peak luminosity of 0.5 × 1035 cm−2·s−1 or higher. The STCF will produce a data sample about a factor of 100 larger than that of the present τ-charm factory — the BEPCII, providing a unique platform for exploring the asymmetry of matter-antimatter (charge-parity violation), in-depth studies of the internal structure of hadrons and the nature of non-perturbative strong interactions, as well as searching for exotic hadrons and physics beyond the Standard Model. The STCF project in China is under development with an extensive R&D program. This document presents the physics opportunities at the STCF, describes conceptual designs of the STCF detector system, and discusses future plans for detector R&D and physics case studies.
Эксперименты на Супер чарм-тау фабрике
2024 в печати · ARTICLE · ru
В обзоре обсуждается физическая программа нового эксперимента на Супер чарм-тау фабрике, основой которой станет мощный электрон-позитронный коллайдер со светимостью ~1035 см-2с-1 и энергией в системе центра масс в интервале от 3 до 5 ГэВ. Современный детектор, расположенный вокруг точки столкновения пучков, обеспечит новый уровень точности измерений. Продольная поляризация электронного пучка наряду с рекордной светимостью позволят уникальному эксперименту успешно конкурировать с существующими суперфабриками прелести Belle II и LHCb. Обширная физическая программа включает изучение свойств и измерение физических параметров очарованных адронов, τ-лептона, чармония, экзотических состояний, а также исследование рождения лёгких адронов в e+e--аннигиляции и в двухфотонных процессах. Помимо проверки Стандартной модели и прецизионного измерения её параметров, планируется всесторонний поиск Новой физики за её пределами.
Determination of the CKM angle ϕ3 from a combination of Belle and Belle II results
2024 в печати · ARTICLE · en
We report a determination of the CKM angle ϕ3, also known as γ, from a combination of measurements using samples of up to 711 fb−1 from the Belle experiment and up to 362 fb−1 from the Belle II experiment. We combine results from analyses of B+ → DK+, B+ → Dπ+, and B+ → D*K+ decays, where D is an admixture of D0 and mesons, in a likelihood fit to obtain ϕ3 = (75.2 ± 7.6)°. We also briefly discuss the interpretation of this result.
Study of Υ(10753) decays to π+π−Υ(nS) final states at Belle II
2024 в печати · ARTICLE · en
We present an analysis of the process e+e− → π+π−Υ(nS) (where n = 1, 2, or 3) reconstructed in 19.6 fb−1 of Belle II data during a special run of the SuperKEKB collider at four energy points near the peak of the Υ(10753) resonance. By analyzing the mass distribution of the π+π−Υ(nS) system and the Born cross sections of the e+e− → π+π−Υ(nS) process, we report the first observation of Υ(10753) decays to the π+π−Υ(1S) and π+π−Υ(2S) final states, and find no evidence for decays to π+π−Υ(3S). Possible intermediate states in the π+π−Υ(1S, 2S) transitions are also investigated, and no evidence for decays proceeding via the or f0(980)Υ(nS) intermediate states is found. We measure Born cross sections for the e+e− → π+π−Υ(nS) process that, combined with results from Belle, obtain the mass and width of Υ(10753) to be (10756.6 ± 2.7 ± 0.9) MeV/c2 and (29.0 ± 8.8 ± 1.2) MeV, respectively. The relative ratios of the Born cross sections at the Υ(10753) resonance peak are also reported for the first time.
Measurement of the energy dependence of the e+e− →BB ,BB*, and B*B* cross sections at Belle II
2024 в печати · ARTICLE · en
We report measurements of the e+e− → , , and cross sections at four energies, 10653, 10701, 10746 and 10805 MeV, using data collected by the Belle II experiment. We reconstruct one B meson in a large number of hadronic final states and use its momentum to identify the production process. In the first 2 – 5 MeV above threshold, the e+e− → cross section increases rapidly. This may indicate the presence of a pole close to the threshold.
Measurements of the branching fractions B(B0-bar → D*+ π−) and B(B0-bar → D*+ K−) and tests of QCD factorization
2023 · ARTICLE · en
Using (771.6±10.6)×106 B¯B meson pairs recorded by the Belle experiment at the KEKB e+e−collider, we report the branching fractions B(¯B0→D*+π−)=(2.62±0.02±0.09)×10−3 and B(¯B0→D*+K−)=(2.22±0.06±0.08)×10−4; the quoted uncertainties are statistical and systematic, respectively. A measurement of the ratio of these branching fractions is also presented, RK/π=B(¯B→D*+K−)/B(¯B→D*+π−)=(8.41±0.24±0.13)×10−2, where systematic uncertainties due to the D*+ meson reconstruction cancel out. Furthermore, we report a new QCD factorization test based on the measured ratios for ¯B→D*+h− and ¯B→D*+ℓ−ν decays at squared momentum transfer values equivalent to the mass of the h=π or K hadron. The parameters |a1(h)|are measured to be |a1(π)|=0.884±0.004±0.003±0.016 and |a1(K)|=0.913±0.019±0.008±0.013, where the last uncertainties account for all external inputs. These values are approximately 15% lower than those expected from theoretical predictions. Subsequently, flavor SU(3) symmetry is tested by measuring the ratios for pions and kaons, |a1(K)|2/|a1(π)|2=1.066±0.042±0.018±0.023, as well as for different particle species. The ratio is consistent with unity and therefore no evidence for SU(3) symmetry breaking effects is found at the 5% precision level.
Evidence for the singly Cabibbo-suppressed decay Ωc0 → Ξ−π+ and search for Ωc0 → Ξ−K+ and Ω−K+ decays at Belle
2023 · ARTICLE · en
Using a data sample of 980 fb(-1) collected with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider, we study for the first time the singly Cabibbo-suppressed decays omega(0)(c) -(sic) -pi(+) and omega K--(+) and the doubly Cabibbo-suppressed decay omega(0)(c) -(sic)K--(+). Evidence for an Q0 c signal in the omega(0)(c) -E-pi+ mode is reported with a significance of 4.5 sigma including systematic uncertainties. The ratio of branching fractions to the normalization mode omega(0)(c) -omega(-)pi(+ )is measured to beB(omega(0)(c) -(sic)(-)pi(+))/B(omega(0)(c) -Q-pi+) = 0.253 +/- 0.052(stat.) +/- 0.030(syst.).No significant signals of omega(0)(c) -(sic)K--(+) and omega K--(+) modes are found. The upper limits at 90% confidence level on ratios of branching fractions are determined to be B(omega(0)(c) -> (sic)K--(+))/B(omega(0)(c) -> omega-pi(+)) omega K--(+))/B(omega(0)(c) -> omega-pi(+))
Evidence of a new excited charmed baryon decaying to Σc(2455)0,++π±
2023 · ARTICLE · en
We present the study of (B) over bar (0) -> Sigma(c)(2455)(0, + +) pi(+/-)(p) over bar decays based on 772 x 10(6) B (B) over bar events collected with the Belle detector at the KEKB asymmetric-energy e(+) e(-) collider. The Sigma(c)(2455)(0, + +) candidates are reconstructed via their decay to Lambda(+)(c)x(-/+) and Lambda(+)(c) decays to pK(-)pi(+), pK(S)(0), and Lambda pi(+) final states. The corresponding branching fractions are measured to be B((B) over bar (0) -> Sigma(c)(2455)(0)pi(+)(p) over bar) = (1.09 +/- 0.06 +/- 0.07) x 10(-4) and B((B) over bar (0) -> Sigma(c)(2455)(+ +)pi(-)(p) over bar) = (1.84 +/- 0.11 +/- 0.12) x 10(-4), which are consistent with the world average values with improved precision. A new structure is found in the M-Sigma c(2455)0,M- + + pi +/- spectrum with a significance of 4.2 sigma including systematic uncertainty. The structure is possibly an excited Lambda(+)(c) and is tentatively named Lambda(c)(2910)(+). Its mass and width are measured to be (2913.8 +/- 5.6 +/- 3.8) MeV/c(2) and (51.8 +/- 20.0 +/- 18.8) MeV, respectively. The products of branching fractions for the Lambda(c)(2910)(+) are measured to be B((B) over bar (0) -> Lambda(c)(2910)(+)(p) over bar) x B(Lambda(c)(2910)(+) -> Sigma(c)(2455)(0)pi(+)) = (9.5 +/- 3.6 +/- 1.6) x 10(-6) and B((B) over bar (0) -> Lambda(c)(2910)(+)(p) over bar) x B(Lambda(c)(2910)(+) -> Sigma(c)(2455)(+ +)pi(-)) = (1.24 +/- 0.35 +/- 0.10) x 10(-5). Here, the first and second uncertainties are statistical and systematic, respectively.
Studies of e+e− → ηφ via Initial State Radiation
2023 · ARTICLE · en
Using 980 fb(-1) of data collected on and around the Upsilon(nS) (n = 1, 2, 3, 4, 5) resonances with the Belle detector at the KEKB collider, we measure the cross section of e(+) e(-) -> eta phi from threshold to 3.95 GeV via initial state radiation. There are clear phi(1680) and J/psi signals but no significant phi(2170) signal in the eta phi final state. The branching fraction B[J/psi -> eta phi] is measured to be (7.2 +/- 0.8 +/- 0.5) x 10(-4). The resonant parameters of phi(1680) are determined to be m(phi(1680)) = (1696 +/- 8 +/- 10) MeV/c(2) (statistical and systematic errors, respectively), Gamma(phi(1680)) = (175 +/- 13 +/- 16) MeV and, depending on the possible presence of predominantly constructive or destructive interference between phi(1680) and continuum production, Gamma(e+e-)(phi(1680))center dot B[phi(1680) -> eta phi] and B[phi(1680) -> eta phi] are determined to be (75 +/- 10 +/- 11) eV and (25 +/- 12 +/- 2)% or (207 +/- 16 +/- 20) eV and (23 +/- 10 +/- 2)%, respectively. The upper limit for Gamma(e+e-)(phi(2170)) center dot B[phi(2170) -> eta phi] is determined to be either 0.17 or 18.6 eV at the 90% confidence level.
Measurement of two-photon decay width of χc2(1P) in γγ → χc2(1P) → J/ψγ at Belle
2023 · ARTICLE · en
We report the measurement of the two-photon decay width of chi c2(1P) in two-photon processes at the Belle experiment. We analyze the process gamma gamma ->chi c2(1P)-> J/psi gamma, J/psi -> l(+)l(-) (l=e or mu) using a data sample of 971 fb(-1) collected with the Belle detector at the KEKB e(+)e(-) collider. In this analysis, the product of the two-photon decay width of chi c2(1P) and the branching fraction is determined to be gamma gamma gamma(chi c2(1P))B(chi c2(1P)-> J/psi gamma)B(J/psi -> l(+)l(-))=14.8 +/- 0.3(stat.) +/- 0.7(syst.) eV, which corresponds to gamma gamma gamma(chi c2(1P)) = 653 +/- 13(stat.) +/- 31(syst.) +/- 17(B.R.) eV, where the third uncertainty is from B(chi c2(1P)-> J/psi gamma) and B(J/psi -> l(+)l(-)).
Курсы (1)
-
Основы современной физики: атомная и ядерная физика
2021/2022 · Бакалавриат · рус