502 research outputs found

    Economic processes in the safety measurement

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    The monograph covers the theoretical and methodological foundations of the formation of economic security system and the determinants of its development. Special attention is paid to the influence of geoeconomic factors on the country's economic security in the conditions of globalization and the elimination of the negative impact of world crises on the economic security of Ukraine. The monograph provides a thorough analysis of the international policy of ensuring national security in the context of economic and social aspects. The problem of economic security of regions and economic entities is investigated. The monograph is intended for scientists, lecturers, civil servants, specialists, managers of enterprises and financial institutions, teachers, postgraduates, students, as well as a wide range of readers who are studying national economic security problems

    Multidifferential study of identified charged hadron distributions in ZZ-tagged jets in proton-proton collisions at s=\sqrt{s}=13 TeV

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    Jet fragmentation functions are measured for the first time in proton-proton collisions for charged pions, kaons, and protons within jets recoiling against a ZZ boson. The charged-hadron distributions are studied longitudinally and transversely to the jet direction for jets with transverse momentum 20 <pT<100< p_{\textrm{T}} < 100 GeV and in the pseudorapidity range 2.5<η<42.5 < \eta < 4. The data sample was collected with the LHCb experiment at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 1.64 fb−1^{-1}. Triple differential distributions as a function of the hadron longitudinal momentum fraction, hadron transverse momentum, and jet transverse momentum are also measured for the first time. This helps constrain transverse-momentum-dependent fragmentation functions. Differences in the shapes and magnitudes of the measured distributions for the different hadron species provide insights into the hadronization process for jets predominantly initiated by light quarks.Comment: All figures and tables, along with machine-readable versions and any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2022-013.html (LHCb public pages

    Study of the B−→Λc+Λˉc−K−B^{-} \to \Lambda_{c}^{+} \bar{\Lambda}_{c}^{-} K^{-} decay

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    The decay B−→Λc+Λˉc−K−B^{-} \to \Lambda_{c}^{+} \bar{\Lambda}_{c}^{-} K^{-} is studied in proton-proton collisions at a center-of-mass energy of s=13\sqrt{s}=13 TeV using data corresponding to an integrated luminosity of 5 fb−1\mathrm{fb}^{-1} collected by the LHCb experiment. In the Λc+K−\Lambda_{c}^+ K^{-} system, the Ξc(2930)0\Xi_{c}(2930)^{0} state observed at the BaBar and Belle experiments is resolved into two narrower states, Ξc(2923)0\Xi_{c}(2923)^{0} and Ξc(2939)0\Xi_{c}(2939)^{0}, whose masses and widths are measured to be m(Ξc(2923)0)=2924.5±0.4±1.1 MeV,m(Ξc(2939)0)=2938.5±0.9±2.3 MeV,Γ(Ξc(2923)0)=0004.8±0.9±1.5 MeV,Γ(Ξc(2939)0)=0011.0±1.9±7.5 MeV, m(\Xi_{c}(2923)^{0}) = 2924.5 \pm 0.4 \pm 1.1 \,\mathrm{MeV}, \\ m(\Xi_{c}(2939)^{0}) = 2938.5 \pm 0.9 \pm 2.3 \,\mathrm{MeV}, \\ \Gamma(\Xi_{c}(2923)^{0}) = \phantom{000}4.8 \pm 0.9 \pm 1.5 \,\mathrm{MeV},\\ \Gamma(\Xi_{c}(2939)^{0}) = \phantom{00}11.0 \pm 1.9 \pm 7.5 \,\mathrm{MeV}, where the first uncertainties are statistical and the second systematic. The results are consistent with a previous LHCb measurement using a prompt Λc+K−\Lambda_{c}^{+} K^{-} sample. Evidence of a new Ξc(2880)0\Xi_{c}(2880)^{0} state is found with a local significance of 3.8 σ3.8\,\sigma, whose mass and width are measured to be 2881.8±3.1±8.5 MeV2881.8 \pm 3.1 \pm 8.5\,\mathrm{MeV} and 12.4±5.3±5.8 MeV12.4 \pm 5.3 \pm 5.8 \,\mathrm{MeV}, respectively. In addition, evidence of a new decay mode Ξc(2790)0→Λc+K−\Xi_{c}(2790)^{0} \to \Lambda_{c}^{+} K^{-} is found with a significance of 3.7 σ3.7\,\sigma. The relative branching fraction of B−→Λc+Λˉc−K−B^{-} \to \Lambda_{c}^{+} \bar{\Lambda}_{c}^{-} K^{-} with respect to the B−→D+D−K−B^{-} \to D^{+} D^{-} K^{-} decay is measured to be 2.36±0.11±0.22±0.252.36 \pm 0.11 \pm 0.22 \pm 0.25, where the first uncertainty is statistical, the second systematic and the third originates from the branching fractions of charm hadron decays.Comment: All figures and tables, along with any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2022-028.html (LHCb public pages

    Measurement of the ratios of branching fractions R(D∗)\mathcal{R}(D^{*}) and R(D0)\mathcal{R}(D^{0})

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    The ratios of branching fractions R(D∗)≡B(Bˉ→D∗τ−Μˉτ)/B(Bˉ→D∗Ό−ΜˉΌ)\mathcal{R}(D^{*})\equiv\mathcal{B}(\bar{B}\to D^{*}\tau^{-}\bar{\nu}_{\tau})/\mathcal{B}(\bar{B}\to D^{*}\mu^{-}\bar{\nu}_{\mu}) and R(D0)≡B(B−→D0τ−Μˉτ)/B(B−→D0Ό−ΜˉΌ)\mathcal{R}(D^{0})\equiv\mathcal{B}(B^{-}\to D^{0}\tau^{-}\bar{\nu}_{\tau})/\mathcal{B}(B^{-}\to D^{0}\mu^{-}\bar{\nu}_{\mu}) are measured, assuming isospin symmetry, using a sample of proton-proton collision data corresponding to 3.0 fb−1{ }^{-1} of integrated luminosity recorded by the LHCb experiment during 2011 and 2012. The tau lepton is identified in the decay mode τ−→Ό−ΜτΜˉΌ\tau^{-}\to\mu^{-}\nu_{\tau}\bar{\nu}_{\mu}. The measured values are R(D∗)=0.281±0.018±0.024\mathcal{R}(D^{*})=0.281\pm0.018\pm0.024 and R(D0)=0.441±0.060±0.066\mathcal{R}(D^{0})=0.441\pm0.060\pm0.066, where the first uncertainty is statistical and the second is systematic. The correlation between these measurements is ρ=−0.43\rho=-0.43. Results are consistent with the current average of these quantities and are at a combined 1.9 standard deviations from the predictions based on lepton flavor universality in the Standard Model.Comment: All figures and tables, along with any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2022-039.html (LHCb public pages

    ІНбЕРАКбИВНІ МОЖЛИВОСбІ ĐœĐŁĐ›ĐŹĐąĐ˜ĐœĐ•Đ”Đ†Đ™ĐĐ˜Đ„ Đ•Đ›Đ•ĐšĐąĐ ĐžĐĐĐ˜Đ„ ĐžĐĄĐ’Đ†ĐąĐĐ†Đ„ РЕСУРСІВ

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    АĐșŃ‚ŃƒĐ°Đ»ŃŒĐœŃ–ŃŃ‚ŃŒ статті Đ·ŃƒĐŒĐŸĐČĐ»Đ”ĐœĐ° Ń€Đ”Ń„ĐŸŃ€ĐŒĐ°Ń†Ń–ĐčĐœĐžĐŒĐž ĐżŃ€ĐŸŃ†Đ”ŃĐ°ĐŒĐž ĐČ ŃŃƒŃ‡Đ°ŃĐœŃ–Đč ĐŸŃĐČіті, Ń‰ĐŸ ĐżĐ”Ń€Đ”ĐŽĐ±Đ°Ń‡Đ°ŃŽŃ‚ŃŒ ŃˆĐžŃ€ĐŸĐșĐ” ĐČĐżŃ€ĐŸĐČĐ°ĐŽĐ¶Đ”ĐœĐœŃ Ń–ĐœŃ„ĐŸŃ€ĐŒĐ°Ń†Ń–ĐčĐœĐŸ-ĐșĐŸĐŒŃƒĐœŃ–ĐșаціĐčĐœĐžŃ…, Đ·ĐŸĐșŃ€Đ”ĐŒĐ°, ĐŒŃƒĐ»ŃŒŃ‚ĐžĐŒĐ”ĐŽŃ–ĐčĐœĐžŃ… Ń‚Đ”Ń…ĐœĐŸĐ»ĐŸĐłŃ–Đč у ĐœĐ°ĐČŃ‡Đ°Đ»ŃŒĐœĐžĐč ĐżŃ€ĐŸŃ†Đ”Ń. ĐŁ статті Ń€ĐŸĐ·ĐłĐ»ŃĐŽĐ°Ń”Ń‚ŃŒŃŃ таĐșĐ° ĐČластОĐČість ĐŒŃƒĐ»ŃŒŃ‚ĐžĐŒĐ”ĐŽŃ–ĐčĐœĐžŃ… ĐŸŃĐČŃ–Ń‚ĐœŃ–Ń… Ń€Đ”ŃŃƒŃ€ŃŃ–ĐČ ŃĐș Ń–ĐœŃ‚Đ”Ń€Đ°ĐșтоĐČĐœŃ–ŃŃ‚ŃŒ. Дається ĐČĐžĐ·ĐœĐ°Ń‡Đ”ĐœĐœŃ ĐżĐŸĐœŃŃ‚Ń‚Ń â€œŃ–ĐœŃ‚Đ”Ń€Đ°ĐșтоĐČĐœŃ–ŃŃ‚ŃŒâ€, ĐœĐ°ĐČĐŸĐŽŃŃ‚ŃŒŃŃ Ń€Ń–Đ·ĐœĐŸĐČОЎО Ń–ĐœŃ‚Đ”Ń€Đ°ĐșтоĐČĐœĐŸŃŃ‚Ń–, ĐŸĐżĐžŃŃƒŃŽŃ‚ŃŒŃŃ її ĐŒĐŸĐ¶Đ»ĐžĐČĐŸŃŃ‚Ń– і Đ·ĐœĐ°Ń‡Đ”ĐœĐœŃ. А таĐșĐŸĐ¶ Đ°ĐČŃ‚ĐŸŃ€Đž ĐœĐ°ĐČĐŸĐŽŃŃ‚ŃŒ проĐșлаЎО праĐșŃ‚ĐžŃ‡ĐœĐŸĐłĐŸ ĐČŃ‚Ń–Đ»Đ”ĐœĐœŃ Ń–ĐœŃ‚Đ”Ń€Đ°ĐșтоĐČĐœĐžŃ… ĐŒĐŸĐ¶Đ»ĐžĐČĐŸŃŃ‚Đ”Đč ĐŒŃƒĐ»ŃŒŃ‚ĐžĐŒĐ”ĐŽŃ–ĐčĐœĐžŃ… Ń‚Đ”Ń…ĐœĐŸĐ»ĐŸĐłŃ–Đč піЮ час стĐČĐŸŃ€Đ”ĐœĐœŃ ДлДĐșŃ‚Ń€ĐŸĐœĐœĐžŃ… ĐŸŃĐČŃ–Ń‚ĐœŃ–Ń… Ń€Đ”ŃŃƒŃ€ŃŃ–ĐČ

    Electron energy probability function in the temporal afterglow of a dusty plasma

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    The kinetic description of the electron energy probability function (EEPF) in a dusty afterglow plasma is considered for two typical cases: when the rate of electron-neutral momentum-transfer collisions is independent of the electron energy and when it is a power function of the electron energy. The electron Boltzmann equation is solved using the method of characteristics and analytical expressions for the EEPF are obtained for different initial EEPFs (including both Maxwellian and Druyvesteyn distributions) at electron energies larger than the dust-surface potential. The analytical EEPF functions are then used to analyze several experimental parameter regimes of the dust radius and density, the dust-charge decay time, the afterglow duration, etc. It is also found that absorption of electrons by the dust particles plays an important role in determining the EEPF in a dusty afterglow

    Long, vertically aligned single-walled carbon nanotubes from plasmas: Morpho-kinetic and alignment controls

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    The enhanced large-scale model and numerical simulations are used to clarify the growth mechanism and the differences between the plasma- and neutral gas-grown carbon nanotubes, and to reveal the underlying physics and the key growth parameters. The results show that the nanotubes grown by plasma can be longer due to the effects of hydrocarbon ions with velocities aligned with the nanotubes. We show that the low-temperature growth is possible when the hydrocarbon ion flux dominates over fluxes of other species. We have also analysed the dependencies of the nanotube growth rates on nanotube and process parameters. The results are verified by a direct comparison with the experimental data. The model is generic and can be used for other types of carbon nanostructures such as carbon nanowalls, vertical graphenes, etc

    Back cover: Plasma Process. Polym. 8∕2014

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    Back Cover The growth mechanism was clarified and differences between the plasma- and neutral gas-grown carbon nanotubes were explained by using an enhanced large-scale model and numerical simulation technique. The nanotubes synthesized by plasma process can be longer than those synthesized by neutral gas technique. The low-temperature growth of the nanotube array is also possible when the hydrocarbon ion flux to the nanotubes dominates over fluxes of other species. Further details can be found in the article Gennady Burmaka et al. on page 798

    Measurement of the Λb0→J/ψΛ\Lambda^0_b\rightarrow J/\psi\Lambda angular distribution and the Λb0\Lambda^0_b polarisation in pppp collisions

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    International audienceThis paper presents an analysis of the Λb0 {\Lambda}_b^0 → J/ψΛ angular distribution and the transverse production polarisation of Λb0 {\Lambda}_b^0 baryons in proton-proton collisions at centre-of-mass energies of 7, 8 and 13 TeV. The measurements are performed using data corresponding to an integrated luminosity of 4.9 fb−1^{−1}, collected with the LHCb experiment. The polarisation is determined in a fiducial region of Λb0 {\Lambda}_b^0 transverse momentum and pseudorapidity of 1 < pT_{T}< 20 GeV/c and 2 < η < 5, respectively. The data are consistent with Λb0 {\Lambda}_b^0 baryons being produced unpolarised in this region. The parity-violating asymmetry parameter of the Λ → pπ−^{−} decay is also determined from the data and its value is found to be consistent with a recent measurement by the BES III collaboration.[graphic not available: see fulltext

    Measurement of the electron reconstruction efficiency at LHCb

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    International audienceThe single electron track-reconstruction efficiency is determined using a sample corresponding to 1.3 fb−11.3~\mathrm{fb}^{-1}of pppp collision data recorded with the LHCb detector in 2017. This measurement exploits B+→J/ψ(e+e−)K+B^+\to J/\psi (e^+e^-)K^+ decays, where one of the electrons is fully reconstructed and paired with the kaon, while the other electron is reconstructed using only the information of the vertex detector. Despite this partial reconstruction, kinematic and geometric constraints allow the B+B^+-meson mass to be reconstructed and the signal to be well separated from backgrounds. This in turn allows the electron reconstruction efficiency to be measured by matching the partial track segment found in the vertex detector to tracks found by LHCb's regular reconstruction algorithms. The agreement between data and simulation is evaluated, and corrections are derived for simulated electrons in bins of kinematics. The presented method allows LHCb to measure branching fractions involving single electrons with a an electron reconstruction systematic uncertainty below 1%1\%
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