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Пахлов Павел Николаевич

Московский институт электроники и математики им. А.Н. Тихонова

Профиль на hse.ru ↗ тел.: 00000
Публикаций
126
Языков
2
Наград
3
Конференций
2
Профиль Публикации (126) Курсы (2)

Профессиональные интересы

физика элементарных частиц

Должности

  • Ведущий научный сотрудник — Московский институт электроники и математики им. А.Н. Тихонова, Международная лаборатория физики элементарных частиц
  • Профессор — Московский институт электроники и математики им. А.Н. Тихонова, Департамент электронной инженерии

Био

  • · Начал работать в НИУ ВШЭ в 2020 году.
  • · Научно-педагогический стаж: 8 лет.

Образование

  • 2008 · Доктор физико-математических наук: Высшая аттестационная комиссия Республика Болгария
  • 1990 · Специалитет: Московский физико-технический институт, специальность «Прикладная математика и физика», квалификация «Инженер-физик»

Опыт работы

  • · 2000 - н.в.: профессор кафедры физики элемнтарных частиц МФТИ
  • · 2009 - н.в.: профессор кафедры экспериментальной ядерной физики и космофизики МИФИ
  • · 2020 - н.в.: профессор кафедры дискретной математики МИЭМ ВШЭ

Награды и поощрения

  • · Надбавка за публикацию в журнале из Списка А (и приравненном к нему научном издании) (2025–2026, 2024–2025, 2023–2024)
  • · Надбавка за публикацию в международном рецензируемом научном издании (2021–2022)
  • · Лучший преподаватель — 2021–2022

Гранты и проекты

  • — · на соискание учёной степени кандидата наук

Конференции (2)

Показать все
  • · 2024: The 2024 International Workshop on Future Tau Charm Facilities (Хефей). Доклад: On possibility to measure all Michel parameters at SCTF
  • · 2020: 5th International Conference on Particle Physics and Astrophysics (Москва). Доклад: Recent experimental results in B physics

Идентификаторы исследователя

Публикации (126)

Study of Electromagnetic Decays of Orbitally Excited Ξc Baryons

2020 · ARTICLE · en

Using 980 fb−1 of data collected with the Belle detector operating at the KEKB asymmetric-energy e^+e^- collider, we report a study of the electromagnetic decays of excited {charmed baryons} Ξc(2790) and Ξc(2815). A clear signal (8.6 standard deviations) is observed for Ξc(2815)0→Ξ0cγ, and we measure: B[Ξc(2815)0→Ξ0cγ]/B[Ξc(2815)0→Ξc(2645)+π−→Ξ0cπ+π−]=0.41±0.05±0.03. We also present evidence (3.8 standard deviations) for the similar decay of the Ξc(2790)0 and measure: B[Ξc(2790)0→Ξ0cγ]/B[Ξc(2790)0→Ξ′+cπ−→Ξ+cγπ−]=0.13±0.03±0.02. The first quoted uncertainties are statistical and the second systematic. We find no hint of the analogous decays of the Ξc(2815)+ and Ξc(2790)+ baryons and set upper limits at the 90% confidence level of: B[Ξc(2815)+→Ξ+cγ]/B[Ξc(2815)+→Ξc(2645)0π+→Ξ+cπ−π+]B[Ξc(2790)+→Ξ+cγ]/B[Ξc(2790)+→Ξ′0cπ+→Ξ0cγπ+] Approximate values of the partial widths of the decays are extracted, which can be used to discriminate between models of the underlying quark structure of these excited states.

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Measurement of Branching Fractions of Λ+c→ηΛπ+, ηΣ0π+, Λ(1670)π+, and ηΣ(1385)+

2020 в печати · ARTICLE · en

We report branching fraction measurements of four decay modes of the Λ+c baryon, each of which includes an η meson and a Λ baryon in the final state, and all of which are measured relative to the Λ+c→pK−pi+ decay mode. The results are based on a 980 fb−1 data sample collected by the Belle detector at the KEKB asymmetric-energy e+e− collider. Two decays, ηΣ0π+ and Λ(1670)π+, are observed for the first time, while the measurements of the other decay modes, Λ+c→ηΛπ+ and ηΣ(1385)+, are more precise than those made previously. We obtain B(Λ+c→ηΛπ+)/B(Λ+c→pK−π+) = 0.293±0.003±0.014, B(Λ+c→ηΣ0π+)/B(Λ+c→pK−π+) = 0.120±0.006±0.006, B(Λ+c→Λ(1670)π+)×B(Λ(1670)→ηΛ)/B(Λ+c→pK−π+) = (5.54±0.29±0.73)×10−2, and B(Λ+c→ηΣ(1385)+)/B(Λ+c→pK−π+) = 0.192±0.006±0.016. The mass and width of the Λ(1670) are also precisely determined to be 1674.3±0.8±4.9 MeV/c2 and 36.1±2.4±4.8 MeV, respectively, where the uncertainties are statistical and systematic, respectively.

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First Determination of the Spin and Parity of a Charmed-Strange Baryon, Ξc(2970)+

2020 в печати · ARTICLE · en

We report results from a study of the spin and parity of Ξc(2970)+ using a 980 fb−1 data sample collected by the Belle detector at the KEKB asymmetric-energy e+e− collider. The decay angle distributions in the chain Ξc(2970)+→Ξc(2645)0π+→Ξ+cπ−π+ are analyzed to determine the spin of this charmed-strange baryon. The angular distributions strongly favor the Ξc(2970)+ spin J=1/2 over 3/2 or 5/2, under an assumption that the lowest partial wave dominates in the decay. We also measure the ratio of Ξc(2970)+ decay branching fractions R=B[Ξc(2970)+→Ξc(2645)0π+]/B[Ξc(2970)+→Ξ′0cπ+]=1.67±0.29(stat.)+0.15−0.09(syst.)±0.25(IS), where the last uncertainty is due to possible isospin-symmetry-breaking effects. This R value favors the spin-parity JP=1/2+ with the spin of the light-quark degrees of freedom sl=0. This is the first determination of the spin and parity of a charmed-strange baryon.

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Search for transitions from Υ(4S) and Υ(5S) to ηb(1S) and ηb(2S) with emission of an ω meson

2020 в печати · ARTICLE · en

Using data collected in the Belle experiment at the KEKB asymmetric-energy e+e− collider we search for transitions Υ(4S)→ηb(1S)ω, Υ(5S)→ηb(1S)ω and Υ(5S)→ηb(2S)ω. No significant signals are observed and we set 90\% confidence level upper limits on the corresponding visible cross sections: 0.2 pb,0.4 pb and 1.9 pb, respectively.

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Evidence for X(3872)→J/ψπ+π− produced in single-tag two-photon interactions

2020 в печати · ARTICLE · en

We report the first evidence for X(3872) production in two-photon interactions by tagging either the electron or the position in the final state, exploring the highly virtual photon region. The search is performed in e+e−→e+e−J/ψπ+π−, using 825 fb−1 of data collected by the Belle detector operated at the KEKB e+e− collider. We observe three X(3872) candidates with an expected background of 0.11±0.10 events, with a significance of 3.2σ. We obtain an estimated value for Γ~γγB(X(3872)→J/ψπ+π−) assuming the Q2 dependence predicted by a cc¯ meson model, where −Q2 is the invariant mass-squared of the virtual photon. No X(3915)→J/ψπ+π− candidates are found.

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Search for a doubly-charged DDK bound state in Υ(1S,2S) inclusive decays and via direct production in e+e− collisions at s√ = 10.520, 10.580, and 10.867 GeV

2020 в печати · ARTICLE · en

We report the results of a first search for a doubly-charged DDK bound state, denoted the R++, in Υ(1S) and Υ(2S) inclusive decays and via direct production in e+e− collisions at s√ = 10.520, 10.580, and 10.867 GeV. The search uses data accumulated with the Belle detector at the KEKB asymmetric-energy e+e− collider. No significant signals are observed in the D+D∗+s invariant-mass spectra of all studied modes. The 90\% credibility level upper limits on their product branching fractions in Υ(1S) and Υ(2S) inclusive decays (B(Υ(1S,2S)→R+++anything)×B(R++→D+D∗+s)), and the product values of Born cross section and branching fraction in e+e− collisions (σ(e+e−→R+++anything)×B(R++→D+D∗+s)) at s√ = 10.520, 10.580, and 10.867 GeV under different assumptions of R++ masses varying from 4.13 to 4.17 GeV/c2, and widths varying from 0 to 5 MeV are obtained.

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Search for the B →Y(4260)K, Y(4260) →J/ψπ+π- decays

2019 · ARTICLE · en

We report the results of a search for the B→Y(4260)K, Y(4260)→J/ψπ+π− decays. This study is based on a data sample corresponding to an integrated luminosity of 711~fb−1 , collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e− collider. We investigate the J/ψπ+π− invariant mass distribution in the range 4.0 to 4.6 GeV/c2 using both B+→J/ψπ+π−K+ and B0→J/ψπ+π−K0S decays. We find excesses of events above the background levels, with a significances of 2.1 and 0.9 standard deviations for charged and neutral B→Y(4260)K decays, respectively, taking into account the systematic uncertainties. These correspond to upper limits on the product of branching fractions, B(B+→Y(4260)K+)×B(Y(4260)→J/ψπ+π−)B0→Y(4260)K0)×B(Y(4260)→J/ψπ+π−)

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Measurements of the branching fractions B(B- → Λc-Ξ'c0), B(B- → Λc-Ξc(2645)0) and B(B- → Λc-Ξc(2790)0

2019 · ARTICLE · en

Using the data sample of 711 fb−1 of Υ(4S) on-resonance data taken by the Belle detector at the KEKB asymmetric-energy electron-positron collider, we present the first measurements of branching fractions of the decays B−→Λ¯−cΞ′0c , B−→Λ¯−cΞc(2645)0 , and B−→Λ¯−cΞc(2790)0 . The signal yields for these decays are extracted from the recoil mass spectrum of the system recoiling against Λ¯−c baryons in selected B− candidates. The branching fraction of B−→Λ¯−cΞc(2790)0 is measured to be (1.1±0.4±0.2)×10−3 , where the first uncertainty is statistical and the second systematic. The 90\% credibility level upper limits on B(B−→Λ¯−cΞ′0c) and B(B−→Λ¯−cΞc(2645)0) are determined to be 6.5×10−4 and 7.9×10−4 , respectively.

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Observation of a new structure near 10.75 GeV in the energy dependence of the e+e- → ϒ(nS)π+π- (n=1,2,3) cross sections

2019 · ARTICLE · en

We report a new measurement of the e+e−→Υ(nS)π+π− (n=1,2,3) cross sections at energies from 10.52 to 11.02 GeV using data collected with the Belle detector at the KEKB asymmetric-energy e+e− collider. We observe a new structure in the energy dependence of the cross sections; if described by a Breit-Wigner function its mass and width are found to be M=(10752.7±5.9+0.7−1.1)MeV/c2 and Γ=(35.5+17.6−11.3+3.9−3.3)MeV, where the first error is statistical and the second is systematic. The global significance of the new structure including systematic uncertainty is 5.2 standard deviations. We also find evidence for the e+e−→Υ(1S)π+π− process at the energy 10.52 GeV, which is below the BB¯ threshold.

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Search for X(3872) and X(3915) decay into chi(c1)pi(0) in B decays at Belle

2019 · ARTICLE · en

We report a search for X(3872) and X(3915) in B+→χc1π0K+ decays. We set an upper limit of B(B+→X(3872)K+)×B(X(3872)→χc1π0) B+→X(3915)K+)×B(X(3915)→χc1π0) X(3872)→χc1π0)/B(X(3872)→J/ψπ+π−)BB¯¯¯¯ events collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e− collider.

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Курсы (2)