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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)

Measurement of B → K*(892)γ decays at Belle II

2025 в печати · ARTICLE · en

We present measurements of B→K∗(892)γ decays using 365fb−1 of data collected from 2019 to 2022 by the Belle~II experiment at the SuperKEKB asymmetric-energy e+e− collider. The data sample contains (387±6)×106 Υ(4S) events. We measure branching fractions () and CP asymmetries (CP) for both B0→K∗0γ and B+→K∗+γ decays. The difference in CP asymmetries (ΔCP) and the isospin asymmetry (Δ0+) between these neutral and charged channels are also measured. We obtain the following branching fractions and CP asymmetries: (B0→K∗0γ)=(4.14±0.10±0.11)×10−5, (B+→K∗+γ)=(4.04±0.13+0.13−0.15)×10−5, CP(B0→K∗0γ)=(−3.3±2.3±0.4)%, and CP(B+→K∗+γ)=(−0.7±2.9±0.5)%. The measured difference in CP asymmetries is ΔCP=(+2.6±3.8±0.6)%, and the measured isospin asymmetry is Δ0+=(+4.8±2.0±1.8)%. The first uncertainties listed are statistical and the second are systematic. These results are consistent with world-average values and theory predictions.

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Charged-hadron identification at Belle II

2025 в печати · ARTICLE · en

The Belle II experiment’s ability to identify particles critically affects the sensitivity of its measurements. We describe Belle II’s algorithms for identifying charged particles and evaluate their performance in separating pions, kaons, and protons using 426 1/fb of data collected at the energy-asymmetric e+e- collider SuperKEKB in 2019–2022 at center-of-mass energies at and near the mass of the Y(4S).

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Measurement of the D0→K−π+e+e− branching fraction and search for D0→π+π−e+e− and D0→K+K−e+e− decays at Belle

2025 в печати · ARTICLE · en

We present a study of the rare charm meson decays D0→K+K−e+e−, π+π−e+e−, and K−π+e+e− using a 942 fb−1 data set collected by the Belle detector at the KEKB asymmetric-energy e+e− collider. We use D0 candidates identified by the charge of the pion in D∗→D0π decays and normalize the branching fractions to D0→K−π+π−π+ decays. The branching fraction for decay D0→K−π+e+e− is measured to be (39.6 ± 4.5 (stat) ± 2.9 (syst)) × 10−7, with the dielectron mass in the ρ/ω mass region 675

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Conceptual design report of the Super Tau-Charm Facility: the accelerator

2025 · ARTICLE · en

Electron–positron colliders operating in the GeV center-of-mass range, or tau-charm energy region, have been proved to enable competitive frontier research due to several unique features. With the progress of high-energy physics in the last two decades, a new-generation Tau-Charm factory, called the Super Tau-Charm Facility (STCF), has been actively promoted by the particle physics community in China. STCF has the potential to address fundamental questions such as the essence of color confinement and the matter–antimatter asymmetry within the next decades. The main design goals of the STCF are a center-of-mass energy ranging from 2 to 7 GeV and a luminosity surpassing 5 × 1034 cm−2 s−1 that is optimized at a center-of-mass energy of 4 GeV, which is approximately 50 times that of the currently operating Tau-Charm factory—BEPCII. The STCF accelerator has two main parts: a double-ring collider with a crab-waist collision scheme and an injector that provides top-up injections for both electron and positron beams. As a typical third-generation electron–positron circular collider, the STCF accelerator faces many challenges in both accelerator physics and technology. In this paper, the conceptual design of the STCF accelerator complex is presented, including the ongoing efforts and plans for technological research and development, as well as the required infrastructure. The STCF project aims to secure support from the Chinese central government for its construction during the 15th Five-Year Plan (2026–2030).

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Measurement of the e+e−→π+π−π0 cross section in the energy range 0.62-3.50 GeV at Belle II

2024 в печати · ARTICLE · en

We report a measurement of the 𝑒+⁢𝑒− →𝜋+⁢𝜋−⁢𝜋0 cross section in the energy range from 0.62 to 3.50 GeV using an initial-state radiation technique. We use an 𝑒+⁢𝑒− data sample corresponding to 191 fb−1 of integrated luminosity, collected at a center-of-mass energy at or near the ϒ⁡(4⁢𝑆)resonance with the Belle II detector at the SuperKEKB collider. Signal yields are extracted by fitting the two-photon mass distribution in 𝑒+⁢𝑒− →𝜋+⁢𝜋−⁢𝜋0⁢𝛾 events, which involve a 𝜋0 →𝛾⁢𝛾 decay and an energetic photon radiated from the initial state. Signal efficiency corrections with an accuracy of 1.6% are obtained from several control data samples. The uncertainty on the cross section at the 𝜔and 𝜙 resonances is dominated by the systematic uncertainty of 2.2%. The resulting cross sections in the 0.62–1.80 GeV energy range yield 𝑎3⁢𝜋𝜇 =[48.91 ±0.23⁢(stat) ±1.07⁢(syst)] ×10−10 for the leading-order hadronic vacuum polarization contribution to the muon anomalous magnetic moment. This result differs by 2.5 standard deviations from the most precise current determination.

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Measurement of CP asymmetries in B0→η′K0s decays at Belle II

2024 в печати · ARTICLE · en

We describe a measurement of charge-parity (𝐶⁢𝑃) violation asymmetries in 𝐵0 →𝜂′⁢𝐾0S decays using Belle II data. We consider 𝜂′ →𝜂⁡( →𝛾⁢𝛾)⁢𝜋+⁢𝜋− and 𝜂′ →𝜌⁡( →𝜋+⁢𝜋−)⁢𝛾 decays. The data were collected at the SuperKEKB asymmetric-energy 𝑒+⁢𝑒− collider between the years 2019 and 2022, and contain (387 ±6) ×106 bottom-antibottom meson pairs. We reconstruct 829 ±35 signal decays and extract the 𝐶⁢𝑃 violating parameters from a fit to the distribution of the proper-decay-time difference between the two 𝐵 mesons. The measured direct and mixing-induced 𝐶⁢𝑃 asymmetries are 𝐶𝜂′⁢𝐾0S =−0.19 ±0.08 ±0.03 and 𝑆𝜂′⁢𝐾0S =+0.67 ±0.10 ±0.03, respectively, where the first uncertainties are statistical and the second are systematic. These results are in agreement with current world averages and standard model predictions.

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Search for the baryon number and lepton number violating decays τ−→Λπ− and τ−→Λ¯π− at Belle II

2024 в печати · ARTICLE · en

We present a search for the baryon number 𝐵 and lepton number 𝐿 violating decays 𝜏− →Λ⁢𝜋− and 𝜏− →¯Λ⁢𝜋− produced from the 𝑒+⁢𝑒− →𝜏+⁢𝜏− process, using a 364 fb−1 data sample collected by the Belle II experiment at the SuperKEKB collider. No evidence of signal is found in either decay mode, which have |Δ⁢(𝐵 −𝐿)| equal to 2 and 0, respectively. Upper limits at 90% credibility level on the branching fractions of 𝜏− →Λ⁢𝜋− and 𝜏− →¯Λ⁢𝜋− are determined to be 4.7 ×10−8 and 4.3 ×10−8, respectively.

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Measurement of branching-fraction ratios and CP asymmetries in B± → DCP±K± decays at Belle and Belle II

2024 в печати · ARTICLE · en

We report results from a study of B± → DK± decays followed by D decaying to the CP-even final state K+K− and CP-odd final state , where D is an admixture of D0 and states. These decays are sensitive to the Cabibbo-Kobayashi-Maskawa unitarity-triangle angle ϕ3. The results are based on a combined analysis of the final data set of 772 × 106pairs collected by the Belle experiment and a data set of 198 × 106 pairs collected by the Belle II experiment, both in electron-positron collisions at the Υ(4S) resonance. We measure the CP asymmetries to be CP+ = (+12.5 ± 5.8 ± 1.4)% and CP− = (−16.7 ± 5.7 ±0.6)%, and the ratios of branching fractions to be CP+ = 1.164 ± 0.081 ± 0.036 and CP− = 1.151 ± 0.074 ± 0.019. The first contribution to the uncertainties is statistical, and the second is systematic. The asymmetries CP+ and CP− have similar magnitudes and opposite signs; their difference corresponds to 3.5 standard deviations. From these values we calculate 68.3% confidence intervals of (8.5° ϕ3 °) or (84.5° ϕ3 °) or (163.3° ϕ3 °) and 0.321 rB

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Measurement of branching fractions and direct 𝐶⁢𝑃 asymmetries for 𝐵→𝐾⁢𝜋 and 𝐵→𝜋⁢𝜋 decays at Belle II

2024 в печати · ARTICLE · en

We report measurements of the branching fractions and direct 𝐶⁢𝑃 asymmetries of the decays 𝐵0→𝐾+⁢𝜋−, 𝐵+ →𝐾+⁢𝜋0, 𝐵+ →𝐾0⁢𝜋+, and 𝐵0 →𝐾0⁢𝜋0, and use these for testing the standard model through an isospin-based sum rule. In addition, we measure the branching fraction and direct 𝐶⁢𝑃asymmetry of the decay 𝐵+ →𝜋+⁢𝜋0 and the branching fraction of the decay 𝐵0 →𝜋+⁢𝜋−. The data are collected with the belle II detector from 𝑒+⁢𝑒− collisions at the ϒ⁡(4⁢𝑆) resonance produced by the SuperKEKB asymmetric-energy collider and contain 387 ×106 bottom-antibottom meson pairs. Signal yields are determined in two-dimensional fits to background-discriminating variables, and range from 500 to 3900 decays, depending on the channel. We obtain −0.03 ±0.13 ±0.04 for the sum rule in agreement with the standard model expectation of zero and with a precision comparable to the best existing determinations.

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First Measurement of 𝑅⁡(𝑋𝜏/ℓ) as an Inclusive Test of the 𝑏→𝑐⁢𝜏⁢𝜈 Anomaly

2024 в печати · ARTICLE · en

We measure the tau-to-light-lepton ratio of inclusive 𝐵-meson branching fractions 𝑅⁡(𝑋𝜏/ℓ)≡ℬ⁡(𝐵→𝑋⁢𝜏⁢𝜈)/ℬ⁡(𝐵→𝑋⁢ℓ⁢𝜈), where ℓ indicates an electron or muon, and thereby test the universality of charged-current weak interactions. We select events that have one fully reconstructed 𝐵 meson and a charged lepton candidate from 189 fb−1 of electron-positron collision data collected with the Belle II detector. We find 𝑅⁡(𝑋𝜏/ℓ)=0.228±0.016⁢(stat)±0.036⁢(syst), in agreement with standard-model expectations. This is the first direct measurement of 𝑅⁡(𝑋𝜏/ℓ).

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Курсы (2)