Персона: Беляев, Владимир Никитич
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Инженерно-физический институт биомедицины
Цель ИФИБ и стратегия развития – это подготовка высококвалифицированных кадров на базе передовых исследований и разработок новых перспективных методов и материалов в области инженерно-физической биомедицины. Занятие лидерских позиций в биомедицинских технологиях XXI века и внедрение их в образовательный процесс, что отвечает решению практикоориентированной задачи мирового уровня – диагностике и терапии на клеточном уровне социально-значимых заболеваний человека.
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Владимир Никитич
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208 results
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- ПубликацияТолько метаданныеMeasurement of prompt D0, D+, D*+, and DS+ production in p–Pb collisions at √sNN = 5.02 TeV(2019) Acharya, S.; Adamova, D.; Adhya, S. P.; Adler, A.; Belyaev, V.; Bogdanov, A.; Bolozdynya, A.; Borissov, A.; Grigoriev, V.; Kaplin, V.; Kondratyeva, N.; Loginov, V.; Melikyan, Y.; Samsonov, V.; Selyuzhenkov, I.; Беляев, Владимир Никитич; Богданов, Алексей Александрович; Болоздыня, Александр Иванович; Григорьев, Владислав Анатольевич; Кондратьева, Наталья Викторовна; Логинов, Виталий Александрович© 2019, The Author(s).The measurement of the production of prompt D0, D+, D*+, and DS+ mesons in proton–lead (p–Pb) collisions at the centre-of-mass energy per nucleon pair of sNN = 5.02 TeV, with an integrated luminosity of 292 ± 11 μb−1, are reported. Differential production cross sections are measured at mid-rapidity (−0.96 < ycms< 0.04) as a function of transverse momentum (pT) in the intervals 0 < pT< 36 GeV/c for D0, 1 < pT< 36 GeV/c for D+ and D*+, and 2 < pT< 24 GeV/c for D+ mesons. For each species, the nuclear modification factor RpPb is calculated as a function of pT using a proton-proton (pp) ref- erence measured at the same collision energy. The results are compatible with unity in the whole pT range. The average of the non-strange D mesons RpPb is compared with theoretical model predictions that include initial-state effects and parton transport model predictions. The pT dependence of the D0, D+, and D*+ nuclear modification factors is also reported in the interval 1 < pT< 36 GeV/c as a function of the collision centrality, and the central-to-peripheral ratios are computed from the D-meson yields measured in different centrality classes. The results are further compared with charged-particle measurements and a similar trend is observed in all the centrality classes. The ratios of the pT-differential cross sections of D0, D+, D*+, and DS+ mesons are also reported. The DS+ and D+ yields are compared as a function of the charged-particle multiplicity for several pT intervals. No modification in the relative abundances of the four species is observed with respect to pp collisions within the statistical and systematic uncertainties. [Figure not available: see fulltext.].
- ПубликацияТолько метаданныеBeam test results of 3D pixel detectors constructed with poly-crystalline CVD diamonds(2019) Reichmann, M.; Alexopoulos, A.; Artuso, M.; Bachmair, F.; Belyaev, V.; Беляев, Владимир Никитич© Copyright owned by the author(s) under the terms of the Creative Commons.As a possible candidate for extremely radiation tolerant tracking devices we present a novel detector design - namely 3D detectors - based on poly-crystalline CVD diamond sensors with a pixel readout. The fabrication of recent 3D detectors as well their results in recent beam tests are presented. We measured the hit efficiency and signal response of two 3D diamond detectors with 50 × 50 µm cell sizes using pixel readout chip technologies currently used at CMS and ATLAS. In all runs, both devices attained efficiencies >98 % in a normal incident test beam of minimum ionising particles. The highest efficiency observed during the beam tests was 99.2 %.
- ПубликацияТолько метаданныеSpin alignment measurements using vector mesons with ALICE detector at the LHC(2019) Singh, R.; Acharya, S.; Acosta, F. T.; Adamova, D.; Belyaev, V.; Bogdanov, A.; Grigoriev, V.; Kaplin, V.; Kondratyeva, N.; Loginov, V.; Melikyan, Y.; Samsonov, V.; Selyuzhenkov, I.; Беляев, Владимир Никитич; Богданов, Алексей Александрович; Григорьев, Владислав Анатольевич; Кондратьева, Наталья Викторовна; Логинов, Виталий АлександровичWe present new measurements related to spin alignment of K*(0) vector mesons at mid-rapidity for Pb-Pb collisions at root s(NN) = 2.76 and 5.02 TeV. The spin alignment measurements are carried out with respect to production plane and 2nd order event plane. At low p(T) the spin density matrix element rho(00) for K*(0) is found to have values slightly below 1/3, while it is consistent with 1/3, i.e. no spin alignment, at high p(T). Similar values of rho(00) are observed with respect to both production plane and event plane. Within statistical and systematic uncertainties, rho(00) values are also found to be independent of root s(NN). rho(00) also shows centrality dependence with maximum deviation from 1/3 for mid-central collisions with respect to both the kinematic planes. The measurements for K*(0) in pp collisions at root s = 13 TeV and for K-s(0) (a spin 0 hadron) in 20-40% central Pb-Pb collisions at root s(NN) = 2.76 TeV are consistent with no spin alignment.
- ПубликацияТолько метаданныеALICE results on system-size dependence of charged-particle multiplicity density in p-Pb, Pb-Pb and Xe-Xe collisions(2019) Kim, B.; Acharya, S.; Acosta, F. T.; Adamova, D.; Belyaev, V.; Bogdanov, A.; Grigoriev, V.; Kaplin, V.; Kondratyeva, N.; Loginov, V.; Melikyan, Y.; Samsonov, V.; Selyuzhenkov, I.; Беляев, Владимир Никитич; Богданов, Алексей Александрович; Григорьев, Владислав Анатольевич; Кондратьева, Наталья Викторовна; Логинов, Виталий АлександровичParticle production at LHC energies involves the interplay of hard (perturbative) and soft (non-perturbative) QCD processes. Global observables, such as the charged-particle multiplicity, are related to the initial geometry and the energy density produced in the collision. They are important to characterise relativistic heavy-ion collisions and to constrain model calculations. The LHC produced Xenon-Xenon collisions for the first time in October 2017. New results on the primary charged-particle pseudorapidity density, and its pseudorapidity and centrality dependence are presented for this lighter and deformed nucleus, and compared to measurements obtained for lead ions. New results will also be presented for p-Pb collisions at the highest energy of 8.16 TeV, as part of an overview of all the measurements at LHC Run 1 and 2 energies. These studies allow us to investigate the evolution of particle production with energy and system size and to compare models based on various particle production mechanisms and different initial conditions.
- ПубликацияТолько метаданныеHeavy-flavour hadron decay leptons in Pb-Pb and Xe-Xe collisions at the LHC with ALICE(2019) Dubla, A.; Acharya, S.; Acosta, F. T.; Adamova, D.; Belyaev, V.; Bogdanov, A.; Grigoriev, V.; Kaplin, V.; Kondratyeva, N.; Loginov, V.; Melikyan, Y.; Samsonov, V.; Selyuzhenkov, I.; Беляев, Владимир Никитич; Богданов, Алексей Александрович; Григорьев, Владислав Анатольевич; Кондратьева, Наталья Викторовна; Логинов, Виталий АлександровичHeavy quarks, i.e. charm and beauty, are sensitive probes of the medium produced in high-energy heavy-ion collisions. They are produced in the early stage of the collision, mainly in hard partonic scattering processes, and are expected to experience the whole collision evolution interacting with the medium constituents via both elastic and inelastic processes. The nuclear modification factor (R-AA) is one of the main experimental observables that allow us to investigate the interaction strength of heavy quarks with the medium. The ALICE collaboration measured the production of open heavy-flavour hadrons via their semi-leptonic decays to electrons at mid-rapidity and to moons at forward rapidity in elementary proton-proton (pp) collisions as well as p-Pb, Ph-Ph and in Xe-Xe collisions.
- ПубликацияТолько метаданныеMeasurements of inclusive jet spectra in pp and central Pb-Pb collisions at root S-NN=5.02 TeV(2020) Acharya, S.; Adamova, D.; Adler, A.; Adolfsson, J.; Belyaev, V.; Bogdanov, A.; Bolozdynya, A.; Borissov, A.; Grigoriev, V.; Kaplin, V.; Kondratyeva, N.; Loginov, V.; Melikyan, Y.; Samsonov, V.; Selyuzhenkov, I.; Беляев, Владимир Никитич; Богданов, Алексей Александрович; Болоздыня, Александр Иванович; Григорьев, Владислав Анатольевич; Кондратьева, Наталья Викторовна; Логинов, Виталий АлександровичThis article reports measurements of the p(T)-differential inclusive jet cross section in pp collisions at root S = 5.02 TeV and the p(T)-differential inclusive jet yield in Pb-Pb 0-10% central collisions at root S-NN = 5.02 TeV. Jets were reconstructed at midrapidity with the ALICE tracking detectors and electromagnetic calorimeter using the anti-k(T) algorithm. For pp collisions, we report jet cross sections for jet resolution parameters R = 0.1-0.6 over the range 20 < p(T,jet) < 140 GeV/c, as well as the jet cross-section ratios of different R and comparisons to two next-to-leading-order (NLO)-based theoretical predictions. For Pb-Pb collisions, we report the R = 0.2 and R = 0.4 jet spectra for 40 < p(T,jet) < 140 GeV/c and 60 < p(T,jet) < 140 GeV/c, respectively. The scaled ratio of jet yields observed in Pb-Pb to pp collisions, R-AA, is constructed, and exhibits strong jet quenching and a clear p(T) dependence for R = 0.2. No significant R dependence of the jet R-AA is observed within the uncertainties of the measurement. These results are compared to several theoretical predictions.
- ПубликацияТолько метаданныеNew test beam results of 3D and pad detectors constructed with poly-crystalline CVD diamond(2020) Reichmann, M.; Alexopoulos, A.; Artuso, M.; Bachmair, F.; Belyaev, V.; Беляев, Владимир Никитич© 2019Chemical Vapour Deposition (CVD) diamond is being considered as a material for particle detectors in a harsh radiation environment. This article presents beam test results of 3D pixel detectors fabricated with poly-crystalline CVD diamonds. The cells of the devices had a size of 50µm×50µm with columns 2.6µm in diameter. The cells were ganged in a 3×2 and 5×1 pattern to match the layouts of the pixel read-out electronics currently used in the CMS and ATLAS experiments at the Large Hadron Collider, respectively. In beam tests, using tracks reconstructed with a high precision tracking telescope, a tracking efficiency of 99.3% was achieved. The efficiency of both devices plateaus at a bias voltage of 30V. Also irradiated poly-crystalline CVD diamond pad detectors were investigated. In high rate beam tests with particle fluxes up to 20MHz/cm2 and irradiations up to 8 ⋅ 1015n/cm2 it was shown that the pulse height of irradiated poly-crystalline CVD diamonds does not depend on flux to the O2%.
- ПубликацияТолько метаданныеMultiplicity dependence of light (anti-)nuclei production in p–Pb collisions at sNN=5.02 TeV(2020) Acharya, S.; Adamova, D.; Adhya, S. P.; Adler, A.; Belyaev, V.; Bogdanov, A.; Bolozdynya, A.; Borissov, A.; Grigoriev, V.; Kaplin, V.; Kondratyeva, N.; Loginov, V.; Melikyan, Y.; Samsonov, V.; Selyuzhenkov, I.; Беляев, Владимир Никитич; Богданов, Алексей Александрович; Болоздыня, Александр Иванович; Григорьев, Владислав Анатольевич; Кондратьева, Наталья Викторовна; Логинов, Виталий Александрович© 2019The measurement of the deuteron and anti-deuteron production in the rapidity range −1
- ПубликацияТолько метаданныеMeasurement of electrons from semileptonic heavy-flavour hadron decays at midrapidity in pp and Pb–Pb collisions at sNN=5.02 TeV(2020) Acharya, S.; Adamova, D.; Adhya, S. P.; Adler, A.; Belyaev, V.; Bogdanov, A.; Bolozdynya, A.; Borissov, A.; Grigoriev, V.; Kaplin, V.; Kondratyeva, N.; Loginov, V.; Melikyan, Y.; Samsonov, V.; Selyuzhenkov, I.; Беляев, Владимир Никитич; Богданов, Алексей Александрович; Болоздыня, Александр Иванович; Григорьев, Владислав Анатольевич; Кондратьева, Наталья Викторовна; Логинов, Виталий Александрович© 2020 Conseil Européen pour la Recherche NucléaireThe differential invariant yield as a function of transverse momentum (pT) of electrons from semileptonic heavy-flavour hadron decays was measured at midrapidity in central (0–10%), semi-central (30–50%) and peripheral (60–80%) lead–lead (Pb–Pb) collisions at sNN=5.02 TeV in the pT intervals 0.5–26 GeV/c (0–10% and 30–50%) and 0.5–10 GeV/c (60–80%). The production cross section in proton–proton (pp) collisions at s=5.02 TeV was measured as well in 0.5
- ПубликацияТолько метаданныеScattering Studies with Low-Energy Kaon-Proton Femtoscopy in Proton-Proton Collisions at the LHC(2020) Acharya, S.; Adamova, D.; Adhya, S. P.; Adler, A.; Belyaev, V.; Bogdanov, A.; Bolozdynya, A.; Borissov, A.; Grigoriev, V.; Kaplin, V.; Kondratyeva, N.; Loginov, V.; Melikyan, Y.; Samsonov, V.; Selyuzhenkov, I.; Беляев, Владимир Никитич; Богданов, Алексей Александрович; Болоздыня, Александр Иванович; Григорьев, Владислав Анатольевич; Кондратьева, Наталья Викторовна; Логинов, Виталий АлександровичThe study of the strength and behavior of the antikaon-nucleon ((K) over bar N) interaction constitutes one of the key focuses of the strangeness sector in low-energy quantum chromodynamics (QCD). In this Letter a unique high-precision measurement of the strong interaction between kaons and protons, close and above the kinematic threshold, is presented. The femtoscopic measurements of the correlation function at low pair-frame relative momentum of (K+ p circle plus K- (p) over bar) and (K- p circle plus K+ (p) over bar) pairs measured in pp collisions at root s = 5, 7, and 13 TeV are reported. A structure observed around a relative momentum of 58 MeV/c in the measured correlation function of (K- p circle plus K+ (p) over bar) with a significance of 4.4 sigma constitutes the first experimental evidence for the opening of the ((K) over bar (0)(n) circle plus K-0 (n) over bar) breaking channel due to the mass difference between charged and neutral kaons. The measured correlation functions have been compared to Julich and Kyoto models in addition to the Coulomb potential. The high-precision data at low relative momenta presented in this work prove femtoscopy to be a powerful complementary tool to scattering experiments and provide new constraints above the (K) over barN threshold for low-energy QCD chiral models.