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)
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(-)).
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.
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