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)
Measurements of the branching fractions of Ξ0c→ΛK0S, Ξ0c→Σ0K0S, and Ξ0c→Σ+K- decays at Belle
2022 · ARTICLE · en
Using the entire data sample of 980 fb−1 collected with the Belle detector at the KEKB asymmetric-energy e+e− collider, we present measurements of the branching fractions of the Cabibbo-favored decays Ξ0c→ΛK0S, Ξ0c→Σ0K0S, and Ξ0c→Σ+K−. Taking the decay Ξ0c→Ξ−π+ as the normalization mode, we measure the branching fraction ratio B(Ξ0c→ΛK0S)/B(Ξ0c→Ξ−π+)=0.229±0.008±0.012 with improved precision, and measure the branching fraction ratios B(Ξ0c→Σ0K0S)/B(Ξ0c→Ξ−π+)=0.038±0.006±0.004 and B(Ξ0c→Σ+K−)/B(Ξ0c→Ξ−π+)=0.123±0.007±0.010 for the first time. Taking into account the branching fraction of the normalization mode, the absolute branching fractions are determined to be B(Ξ0c→ΛK0S)=(3.27±0.11±0.17±0.73)×10−3, B(Ξ0c→Σ0K0S)=(0.54±0.09±0.06±0.12)×10−3, and B(Ξ0c→Σ+K−)=(1.76±0.10±0.14±0.39)×10−3. The first and second uncertainties above are statistical and systematic, respectively, while the third ones arise from the uncertainty of the branching fraction of Ξ0c→Ξ−π+.
Search for the decay B0→K∗0τ+τ- at the Belle experiment
2022 · ARTICLE · en
This paper presents a search for the rare flavor-changing neutral current process B0→K*0τ+τ− using data taken with the Belle detector at the KEKB asymmetric energy e+e− collider. The analysis is based on the entire Υ(4S) resonance data sample of 711 fb−1, corresponding to 772×106B¯B pairs. In our search we fully reconstruct the companion B meson produced in the process e+e−→Υ(4S)→B¯B from its hadronic decay modes, and look for the decay B0→K*0τ+τ− in the rest of the event. No evidence for a signal is found. We report an upper limit on the branching fraction B(B0→K*0τ+τ−)
Search for Z' -> mu(+)mu(-) in the L-mu - L-tau gauge-symmetric model at Belle
2022 в печати · ARTICLE · en
Теории, выходящие за рамки Стандартной модели, часто предсказывают существование дополнительного нейтрального бозона Z′. Используя данные, собранные в ходе эксперимента Belle II в 2018 году на коллайдере SuperKEKB, мы проводим первые поиски невидимого распада Z′ в процессе e+ e- --> mu+ mu- Z′ и лептонного распада Z′, нарушающего аромат в e+ e- --> e+- mu-+ Z′. Мы не обнаружили превышения событий и устанавили верхние пределы на 90% уровня правдоподобия для сечений этих процессов. Мы переводим первое в рамках теории L_mu - L_tau в верхние пределы на константы связи Z′ на уровне 5 * 10^{-2} -- 1 M_{Z′}
Search for the radiative penguin decays B0→K0SK0Sγ in the Belle experiment
2022 · ARTICLE · en
We report results from the first search for the rare penguin-dominated decay mode B-0 -> (KSKS0)-K-0 gamma, which can result from the production of tensor mesons f(1270) and f'(1525) in association with a photon. The search uses the full data sample of 772 x 10(6) BB-bar pairs collected with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. No statistically significant signals are observed in the (KSKS0)-K-0 invariant mass range 1 GeV/c(2) (KSKS0)-K-0 gamma) f (2)gamma) x B(f(2) (1270) -> (KSKS0)-K-0) f(2 gamma)') x B(f(2)'(1525) -> (KSKS0)-K-0) (KSKS0)-K-0 gamma branching fraction in bins of M (KS0KS0).
Study of gamma gamma --> gamma psi(2S) at Belle
2022 в печати · ARTICLE · en
Using 980 fb(-1) of data at and around the Upsilon(nS) (n = 1, 2, 3, 4, 5) resonances collected with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider, the two-photon process gamma gamma -> gamma psi(2S) is studied from the threshold to 4.2 GeV for the first time. Two structures are seen in the invariant mass distribution of gamma psi(2S): one at M-R1 = 3922.4 +/- 6.5 +/- 2.0 MeV/c(2) with a width of Gamma(R1) = 22 +/- 17 +/- 4 MeV, and another at M-R2 = 4014.3 +/- 4.0 +/- 1.5 MeV/c(2) with a width of Gamma(R2) = 4 +/- 11 +/- 6 MeV; the signals are parametrized with the incoherent sum of two Breit-Wigner functions. The first structure is consistent with the X(3915) or the chi(c2)(3930), and the local statistical significance is determined to be 3.1 sigma with the systematic uncertainties included. The second matches none of the known charmonium or charmoniumlike states, and its global significance is determined to be 2.8 sigma including the look-elsewhere effect. The production rates are Gamma B-gamma gamma(R-1 -> gamma psi(2S)) = 9.8 +/- 3.6 +/- 1.3 eV assuming (J(PC), vertical bar lambda vertical bar) = (0(++), 0) or 2.0 +/- 0.7 +/- 0.2 eV with (2(++), 2) for the first structure and Gamma B-gamma gamma(R-2 -> gamma psi(2S)) = 6.2 +/- 2.2 +/- 0.8 eV with (0(++), 0) or 1.2 +/- 0.4 +/- 0.2 eV with (2(++), 2) for the second. Here, the first errors are statistical and the second systematic, and lambda is the helicity.
Search for charged lepton flavor violating decays of Upsilon(1S)
2022 в печати · ARTICLE · en
We present a search for the charged lepton-flavor-violating decays Upsilon(1S) -> l(+/-)l'(-/+) and radiative charged lepton-flavour-violating decays Upsilon(1S) -> gamma l(+/-)l'(-/+) [l, l' = e, mu, tau] using the 158 million Upsilon(2S) sample collected by the Belle detector at the KEKB collider. This search uses Upsilon(1S) mesons produced in Upsilon(2S) -> pi(+)pi(-)Upsilon(1S) transitions. We do not find any significant signal, so we provide upper limits on the branching fractions at the 90% confidence level.
Measurement of the branching fraction and CP asymmetry for B -> D0-bar pi decays
2022 в печати · ARTICLE · en
We measure the branching fractions and CP asymmetries for the decays B-0 -> (D) over bar (0)pi(0) and B+ -> (D) over bar (0)pi(+), using a data sample of 772 x 10(6) B (B) over bar pairs collected at the Upsilon(4S) resonance with the Belle detector at the KEKB e(+)e(-) collider. The branching fractions obtained and direct CP asymmetries are B(B-0 -> (D) over bar (0)pi(0)) = [2.70 +/- 0.06(stat) +/- 0.10(syst)] x 10(-4), B(B+ -> (D) over bar (0)pi+) = [4.53 +/- 0.02(stat) +/- 0.15(syst)] x 10(-3), A(CP)(B-0 -> (D) over bar (0)pi(0)) = [+/- 0.42 +/- 2.05(stat) +/- 1.22(syst)]%, and A(CP)((D) over bar (0)pi(+)) = [+0.19 +/- 0.36(stat) +/- 0.57(syst)]%. The measurements of B are the most precise to date and are in good agreement with previous results, as is the measurement of A(CP)((D) over bar (0)pi(+)). The measurement of A(CP) for B-0 -> (D) over bar (0)pi(0) is the first for this mode, and the value is consistent with Standard Model expectations.
An improved search for the electric dipole moment of the tau lepton
2022 в печати · ARTICLE · en
We report a measurement of the electric dipole moment of the tau lepton (d(tau)) using an 833 fb(-1) data sample collected near the Upsilon(4S) resonance, with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. Using an optimal observable method, we obtain the real and imaginary parts of d(tau) as Re(d(tau)) = (-0.62 +/- 0.63) x 10(-17) ecm and Im(d(tau)) = (-0.40 +/- 0.32) x 10(-17) ecm, respectively. These results are consistent with null electric dipole moment at the present level of experimental sensitivity and improve the sensitivity by about a factor of three.
First test of lepton flavor universality in the charmed baryon decays Omega(0)(c) -> Omega(-)l(+)nu(l) using data of the Belle experiment
2022 · ARTICLE · en
We present the first observation of the Omega(0)(c) -> Omega(-)mu(+)nu(mu) decay and present measurements of the branching fraction ratios of the Omega(0)(c) -> Omega(-)l(+)nu(l) decays compared to the reference mode Omega(0)(c) -> Omega(-)pi(+), (l = e or mu). This analysis is based on 89.5 fb(-1), 711 fb(-1), and 121.1 fb(-1) data samples collected with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider at the center-of-mass energies of 10.52 GeV, 10.58 GeV, and 10.86 GeV, respectively. The Omega(0)(c) signal yields are extracted by fitting M-Omega l' and M-Omega pi spectra. The branching fraction ratios B(Omega(0)(c) -> Omega(-)e(+)nu(e))/B(Omega(0)(c) -> Omega(-)pi(+)) and B(Omega(0)(c) -> Omega(-)mu(+)nu(mu))/B(Omega(0)(c) -> Omega(-)pi(+)) are measured to be 1.98 +/- 0.13(stat) +/- 0.08(syst) and 1.94 +/- 0.18(stat) +/- 0.10(syst), respectively. The ratio of B(Omega(0)(c) -> Omega(-)e(+)nu(e))/B(Omega c0 -> Omega(-)mu(+)nu(mu)) is measured to be 1.02 +/- 0.10(stat) +/- 0.02(syst), which is consistent with the expectation of lepton flavor universality.
Search for the decay B-s(0) -> eta eta
2022 в печати · ARTICLE · en
We report results from a search for the decay B-s(0) -> eta eta using 121.4 fb(-1) of data collected at the Upsilon(5S) resonance with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. We do not observe any signal and set an upper limit on the branching fraction of 14.3 x 10(-5) at 90% confidence level. This result represents a significant improvement over the previous most stringent limit.
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