233 research outputs found
Рецензируемые издания как элемент государственной системы научной аттестации
The aim of the work is to analyze peer-reviewed scientific publications as an element of the state system of scientific attestation in order to improve its regulatory legal regulation. The article shows the directions of improving the formation of the list of peer-reviewed scientific publications. Suggestions are made to optimize the formation of the list of peer-reviewed scientific publications, namely, to form a list of peer-reviewed scientific publications by groups of scientific specialties without detailing by branches of science, as well as to improve some regulatory legal acts in terms of requirements for peer-reviewed scientific publications.Проводится анализ рецензируемых научных изданий как элемента государственной системы научной аттестации на предмет совершенствования его нормативного правового регулирования. Показываются направления совершенствования формирования перечня рецензируемых научных изданий. Даются предложения по оптимизации формирования перечня рецензируемых научных изданий, а именно по формированию перечня рецензируемых научных изданий по группам научных специальностей без детализации по отраслям науки, а также по совершенствованию некоторых нормативных правовых актов в части требований к рецензируемым научным изданиям
Search for a Light Higgs Boson in Single-Photon Decays of ϒ(1S) Using ϒ(2S)→ππϒ(1S) Tagging Method
We search for a light Higgs boson (A) decaying into a ττ or μμ pair in the radiative decays of Υ(1S). The production of Υ(1S) mesons is tagged by Υ(2S)→ππΥ(1S) transitions, using 158×10 Υ(2S) events accumulated with the Belle detector at the KEKB asymmetric energy electron positron collider. No significant A signals in the mass range from the ττ or μμ threshold to 9.2 GeV/c are observed. We set the upper limits at 90% credibility level (C.L.) on the product branching fractions for Υ(1S)→γA and A→ττ varying from 3.8×10 to 1.5×10. Our results represent an approximately twofold improvement on the current world best upper limits for the Υ(1S)→γA(→ττ) production. For A→μμ, the upper limits on the product branching fractions for Υ(1S)→γA and A→μμ are at the same level as the world average limits, and vary from 3.1×10 to 1.6×10. The upper limits at 90% credibility level on the Yukawa coupling fΥ(1S) and mixing angle sin θ are also given
First measurement of the Michel parameter in the decay at Belle
We report the first measurement of the Michel parameter in the
decay with a new method proposed just
recently. The measurement is based on the reconstruction of the
events with subsequent muon
decay-in-flight in the Belle central drift chamber. The analyzed data sample of
collected by the Belle detector corresponds to
approximately pairs. We measure
, which is in
agreement with the Standard Model prediction of . Statistical
uncertainty dominates in this study, being a limiting factor, while systematic
uncertainty is well under control. Our analysis proved the practicability of
this promising method and its prospects for further precise measurement in
future experiments.Comment: 6 pages, 4 figures, submitted to Phys. Rev. Let
Search for at Belle
We present a search for the decay in the
data sample collected at the
Belle detector, where the is produced in
and decays. We do not observe a signal, and set 90\%
credible upper limits for two different models of the decay processes: if the
decay products are distributed uniformly in phase space, ; if is concentrated near the mass
of the pair in the process ,
Search for the lepton flavour violating decays () at Belle
We present a search for the lepton-flavour-violating decays , with , using the full data sample of pairs recorded by the Belle detector at the KEKB
asymmetric-energy collider. We use events in which one meson is
fully reconstructed in a hadronic decay mode. We find no evidence for decays and set upper limits on their branching fractions
at the 90% confidence level in the - range. The obtained
limits are the world's best results.Comment: 14 pages, 6 figure
Search for charged-lepton flavor violation in () decays at Belle
We report a search for the charged-lepton flavor violation in () decays using a
sample collected by the Belle detector at the KEKB
asymmetric-energy collider. We find no evidence for a signal and set upper
limits on the branching fractions () at 90 confidence level.
We obtain the most stringent upper limits: and .Comment: 11 pages, 3 figures, Submitted to JHE
Measurement of Angular Coefficients of : Implications for and Tests of Lepton Flavor Universality
We measure the complete set of angular coefficients for exclusive
decays (). Our analysis
uses the full Belle data set with hadronic tag-side
reconstruction. The results allow us to extract the form factors describing the
transition and the Cabibbo-Kobayashi-Maskawa matrix element
. Using recent lattice QCD calculations for the hadronic form
factors, we find using the BGL
parameterization, compatible with determinations from inclusive semileptonic
decays. We search for lepton flavor universality violation as a function of the
hadronic recoil parameter , and investigate the differences of the electron
and muon angular distributions. We find no deviation from Standard Model
expectations
Study of →Dh (h=K/π) decays at Belle
We present a measurement of the branching fractions of the Cabibbo favored →Dπ and the Cabibbo suppressed →DK decays. We find
B( →Dπ)=(2.48±0.01±0.09±0.04)×10 and B( →DK)=(2.03±0.05±0.07±0.03)×10 decays, where the first uncertainty is statistical, the second is systematic, and the third uncertainty is due to the D→K ππ branching fraction. The ratio of branching fractions of →DK and →Dπ is measured to be R=[8.19±0.20(stat)±0.23(syst)]×10. These measurements are performed using the full Belle dataset, which corresponds to 772×10 B pairs and use the Belle II software framework for data analysis
First test of lepton flavor universality in the charmed baryon decays Ω → Ωℓν using data of the Belle experiment
We present the first observation of the Ω0c→Ω−μ+νμ decay and present measurements of the branching fraction ratios of the Ω0c→Ω−ℓ+νℓ decays compared to the reference mode Ω0c→Ω−π+, (ℓ=e or μ). 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 Ω0c signal yields are extracted by fitting MΩℓ and MΩπ spectra. The branching fraction ratios B(Ω0c→Ω−e+νe)/B(Ω0c→Ω−π+) and B(Ω0c→Ω−μ+νμ)/B(Ω0c→Ω−π+) 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(Ω0c→Ω−e+νe)/B(Ω0c→Ω−μ+νμ) is measured to be 1.02±0.10(stat)±0.02(syst), which is consistent with the expectation of lepton flavor universality
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