Пахлова Галина Владимировна
Московский институт электроники и математики им. А.Н. Тихонова
Профессиональные интересы
Должности
- Ведущий научный сотрудник — Московский институт электроники и математики им. А.Н. Тихонова, Международная лаборатория физики элементарных частиц
Био
- · Начала работать в НИУ ВШЭ в 2020 году.
- · Научно-педагогический стаж: 4 года.
Образование
- 2011 · Доктор физико-математических наук: Высшая аттестационная комиссия Республика Болгария
- 1994 · Кандидат физико-математических наук: Институт теоретической и экспериментальной физики
- 1984 · Специалитет: Московский инженерно-физический институт, специальность «Экспериментальная ядерная физика», квалификация «Инженер-физик»
Идентификаторы исследователя
- ORCID:
0000-0001-7518-3022 - ResearcherID:
C-5378-2014 - SPIN РИНЦ:
1406-3272 - Google Scholar: https://scholar.google.com/citations?view_op=list_works&hl=en&user=fFiMLk0AAAAJ&gmla=AJsN-F7mn-IyCnEj_Ug1RmF450uvfNhIP59Uxymi_BKjMGYOUB8KunCrnueLqUiIeo_gIyW4wBX8b-M5m79_triQ4PcDP35zFxATkp5JZ_5okKDfZW6pyWs
- Scopus AuthorID:
35234620700
Публикации (189)
Measurement of the time-integrated CP asymmetry in D0→π0π0 decays at Belle II
2025 в печати · ARTICLE · en
We measure the time-integrated CP asymmetry, ACP, in D0→π0π0 decays reconstructed in e+e−→cc¯ events collected by Belle II during 2019--2022. The data corresponds to an integrated luminosity of 428fb−1. The D0 decays are required to originate from the flavor-conserving D∗+→D0π+ decay to determine the charm flavor at production time. Control samples of D0→K−π+ decays, with or without an associated pion from a D∗+ decay, are used to correct for detection asymmetries. The result, ACP(D0→π0π0)=(0.30±0.72±0.20)%, where the first uncertainty is statistical and the second systematic, is consistent with CP symmetry.
Search for Pcs(4459) and Pcs(4338) in Upsilon(1S,2S) inclusive decays at Belle
2025 в печати · ARTICLE · en
Using data samples of 102 million Upsilon(1S) events and 158 million Upsilon(2S) events collected by the Belle detector at the KEKB asymmetric-energy e+e− collider, we search for [udsccbar] pentaquark states decaying to Jpsi Lambda. Using the first observations of Upsilon(1S, 2S) inclusive decays to Jpsi Lambda, we find evidence of the P_ccbars(4459)0 state with a local significance of 3.3 standard deviations, including statistical and systematic uncertainties. We measure the mass and width of the Pccbars(4459)0 to be (4471.7 +- 4.8 +- 0.6) MeV/c2 and (21.9 +- 13.1 +- 2.7) MeV, respectively. The branching fractions for P_ccbars(4459)0 production are measured to be B[Upsilon(1S) -> P_ccbars(4459)0/ Pbar_ccbars(4459)0 + anything] = (3.5 +- 2.0 +- 0.2)*10-6 and B[Upsilin(2S) -> P_ccbars(4459)0/ Pbar_ccbars(4459)0 +anything] = (2.9 +- 1.7 +- 0.4)*10-6. The inclusive branching fractions of Upsilon(1S, 2S) -> Jpsi Lambda/Lambdabar are measured to be B[Upsilin(1S) -> Jpsi Lambda/Lambdabar + anything] = (36.9 +- 5.3 +- 2.4)*10-6 and B[Upsilon(2S) -> Jpsi Lambda/Lambdabar + anything] = (22.3 +- 5.7 +- 3.1)*10-6. We measure the visible cross section σ(e+e−→J/psiΛ/Λ¯ + anything) = (90 +- 14 +- 6) fb for the continuum production at s√=10.52 GeV. In all cases, the first uncertainties are statistical and the second are systematic.
Measurement of the branching fraction, polarization, and time-dependent CP asymmetry in B0→ρ+ρ− decays and constraint on the CKM angle phi
2025 в печати · ARTICLE · en
We present a measurement of the branching fraction and fraction of longitudinal polarization of B0→ρ+ρ− decays, which have two π0's in the final state. We also measure time-dependent {\it CP} violation parameters for decays into longitudinally polarized ρ+ρ− pairs. This analysis is based on a data sample containing (387±6)×106 Υ(4S) mesons collected with the Belle~II detector at the SuperKEKB asymmetric-energy e+e− collider in 2019-2022. We obtain (B0→ρ+ρ−)=(2.89+0.23−0.22+0.29−0.27)×10−5,fL=0.921+0.024−0.025+0.017−0.015, \mbox{S=−0.26±0.19±0.08}, and C=−0.02±0.12+0.06−0.05, where the first uncertainties are statistical and the second are systematic. We use these results to perform an isospin analysis to constrain the CKM angle ϕ2 and obtain two solutions; the result consistent with other Standard Model constraints is ϕ2=(92.6+4.5−4.7)∘.
Measurement of the branching fraction and CP-violating asymmetry of the decay B0→π0π0 using 387 million bottom-antibottom meson pairs in Belle II data
2025 в печати · ARTICLE · en
We measure the branching fraction and CP-violating flavor-dependent rate asymmetry of B0→π0π0 decays reconstructed using the Belle II detector in an electron-positron collision sample containing 387×106 BB⎯⎯⎯⎯ pairs. Using an optimized event selection, we find 126±20 signal decays in a fit to background-discriminating and flavor-sensitive distributions. The resulting branching fraction is (1.25±0.23)×10−6 and the CP-violating asymmetry is 0.03±0.30.
Model-independent measurement of D0-D0 mixing parameters in D0→K0Sπ+π− decays at Belle and Belle II
2025 в печати · ARTICLE · en
We perform a model-independent measurement of the D0-D⎯⎯⎯⎯0 mixing parameters using samples of e+e−-collision data collected by the Belle and Belle II experiments that have integrated luminosities of 951 fb−1 and 408 fb−1, respectively. Approximately 2.05×106 neutral Dmesons are reconstructed in the D0→K0Sπ+π− channel, with the neutral D flavor tagged by the charge of the pion in the D∗+→D0π+decay. Assuming charge-parity symmetry, the mixing parameters are measured to be x=(4.0±1.7±0.4)×10−3 and y=(2.9±1.4±0.3)×10−3, where the first uncertainties are statistical and the second systematic. The results are consistent with previous determinations.
Measurement of branching fractions, CP asymmetry, and isospin asymmetry for B→ργ decays using Belle and Belle II data
2025 в печати · ARTICLE · en
We present measurements of B+→ρ+γ and B0→ρ0γ decays using a combined data sample of 772×106 BB⎯⎯⎯⎯ pairs collected by the Belle experiment and 387×106 BB⎯⎯⎯⎯ pairs collected by the Belle II experiment in e+e− collisions at the Υ(4S) resonance. After an optimized selection, a simultaneous fit to the Belle and Belle II data sets yields 114±12 B+→ρ+γ and 99±12 B0→ρ0γ decays. The measured branching fractions are (13.1+2.0+1.3−1.9−1.2)×10−7 and (7.5±1.3+1.0−0.8)×10−7 for B+→ρ+γ and B0→ρ0γ decays, respectively, where the first uncertainty is statistical and the second is systematic. We also measure the isospin asymmetry AI(B→ργ)=(10.9+11.2+7.8−11.7−7.3)% and the direct CP asymmetry ACP(B+→ρ+γ)=(−8.2±15.2+1.6−1.2)%.
Observation of the decays B+→Σc(2455)++Ξc and B0→Σc(2455)0Ξ0c
2025 в печати · ARTICLE · en
We report the first observation of the two-body baryonic decays B+→Σc(2455)++Ξ⎯⎯⎯⎯−c and B0→Σc(2455)0Ξ⎯⎯⎯⎯0c with significances of 7.3σand 6.2σ, respectively, including statistical and systematic uncertainties. The branching fractions are measured to be (B+→Σc(2455)++Ξ⎯⎯⎯⎯−c)=(5.74±1.11±0.42+2.47−1.53)×10−4 and (B0→Σc(2455)0Ξ⎯⎯⎯⎯0c)=(4.83±1.12±0.37+0.72−0.60)×10−4. The first and second uncertainties are statistical and systematic, respectively, while the third ones arise from the absolute branching fractions of Ξ⎯⎯⎯⎯−c or Ξ⎯⎯⎯⎯0c decays. The data samples used for this analysis have integrated luminosities of 711~fb−1 and 365~fb−1, and were collected at the Υ(4S) resonance by the Belle and Belle~II detectors operating at the KEKB and SuperKEKB asymmetric-energy e+e− colliders, respectively.
Search for lepton flavor-violating decay modes B0 → K*0τ±ℓ∓ (ℓ = e, μ) with hadronic B-tagging at Belle and Belle II
2025 в печати · ARTICLE · en
We present the results of a search for the charged-lepton-flavor violating decays B0 → K*0τ±ℓ∓, where ℓ∓ is either an electron or a muon. The results are based on 365 fb−1 and 711 fb−1 datasets collected with the Belle II and Belle detectors, respectively. We use an exclusive hadronic B-tagging technique, and search for a signal decay in the system recoiling against a fully reconstructed B meson. We find no evidence for B0 → K*0τ±ℓ∓ decays and set upper limits on the branching fractions in the range of (2.9–6.4)×10−5 at 90% confidence level.
Search for lepton-flavor-violating τ−→ℓ−K0s decays at Belle and Belle II
2025 в печати · ARTICLE · en
We present the results of a search for charged-lepton-flavor violating decays τ−→ℓ−K0S, where ℓ− is either an electron or a muon. We combine e+e− data samples recorded by the Belle II experiment at the SuperKEKB collider (428 fb−1) with samples recorded by the Belle experiment at the KEKB collider (980 fb−1) to obtain a sample of 1.3 billion e+e−→τ+τ− events. We observe 0 and 1 events and set 90% confidence level upper limits of 0.8×10−8 and 1.2×10−8 on the branching fractions of the decay modes τ−→e−K0S and τ−→μ−K0S, respectively. These are the most stringent upper limits to date.
Test of lepton flavor universality with measurements of R(D+) and R(D∗+) using semileptonic B tagging at the Belle II experiment
2025 в печати · ARTICLE · en
We report measurements of the ratios of branching fractions (D(∗)+)=(B⎯⎯⎯⎯0→D(∗)+τ−ν⎯⎯⎯τ)(B⎯⎯⎯⎯0→D(∗)+ℓ−ν⎯⎯⎯ℓ), where ℓ denotes either an electron or a muon. These ratios test the universality of the charged-current weak interaction. The results are based on a 365fb−1 data sample collected with the Belle II detector at the SuperKEKB e+e− collider, which operates at a center-of-mass energy corresponding to the Υ(4S) resonance, just above the threshold for BB⎯⎯⎯⎯ production. Signal candidates are reconstructed by selecting events in which the companion B meson from the Υ(4S)→BB⎯⎯⎯⎯ decay is identified in semileptonic modes. The τ lepton is reconstructed via its leptonic decays. We obtain (D+)=0.418±0.074 (stat)±0.051 (syst) and (D∗+)=0.306±0.034 (stat)±0.018 (syst), which are consistent with world average values. Accounting for the correlation between them, these values differ from the Standard Model expectation by a collective significance of 1.7 standard deviations.
Курсы (0)
Нет курсов.