Персона: Логинов, Виталий Александрович
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Институт ядерной физики и технологий
Цель ИЯФиТ и стратегия развития - создание и развитие научно-образовательного центра мирового уровня в области ядерной физики и технологий, радиационного материаловедения, физики элементарных частиц, астрофизики и космофизики.
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Виталий Александрович
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Теперь показываю 1 - 10 из 196
- ПубликацияОткрытый доступDirect photon elliptic flow in Pb–Pb collisions at sNN=2.76 TeV(2019) Acharya, S.; Acosta, F. T.; Adamova, D.; Adolfsson, J.; 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 Александрович© 2018 The Author The elliptic flow of inclusive and direct photons was measured at mid-rapidity in two centrality classes 0–20% and 20–40% in Pb–Pb collisions at sNN=2.76 TeV by ALICE. Photons were detected with the highly segmented electromagnetic calorimeter PHOS and via conversions in the detector material with the e+e− pairs reconstructed in the central tracking system. The results of the two methods were combined and the direct-photon elliptic flow was extracted in the transverse momentum range 0.9
- ПубликацияОткрытый доступMultiplicity dependence of light-flavor hadron production in pp collisions at s =7 TeV(2019) Acharya, S.; Acosta, F. T.; Adamova, D.; Adler, A.; Belyaev, V.; Bogdanov, A.; Bolozdynya, 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 CERN. Comprehensive results on the production of unidentified charged particles, π±, K±, KS0, K∗(892)0, p, p, φ(1020), Λ, Λ, Ξ-, Ξ+, Ω-, and Ω+ hadrons in proton-proton (pp) collisions at s=7 TeV at midrapidity (|y|<0.5) as a function of charged-particle multiplicity density are presented. In order to avoid autocorrelation biases, the actual transverse momentum (pT) spectra of the particles under study and the event activity are measured in different rapidity windows. In the highest multiplicity class, the charged-particle density reaches about 3.5 times the value measured in inelastic collisions. While the yield of protons normalized to pions remains approximately constant as a function of multiplicity, the corresponding ratios of strange hadrons to pions show a significant enhancement that increases with increasing strangeness content. Furthermore, all identified particle-to-pion ratios are shown to depend solely on charged-particle multiplicity density, regardless of system type and collision energy. The evolution of the spectral shapes with multiplicity and hadron mass shows patterns that are similar to those observed in p-Pb and Pb-Pb collisions at Large Hadron Collider energies. The obtained pT distributions and yields are compared to expectations from QCD-based pp event generators as well as to predictions from thermal and hydrodynamic models. These comparisons indicate that traces of a collective, equilibrated system are already present in high-multiplicity pp collisions.
- ПубликацияОткрытый доступ(Anti-)deuteron production in pp collisions at √s=13TeV(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 Александрович© 2020, The Author(s).The study of (anti-)deuteron production in pp collisions has proven to be a powerful tool to investigate the formation mechanism of loosely bound states in high-energy hadronic collisions. In this paper the production of (anti-)deuterons is studied as a function of the charged particle multiplicity in inelastic pp collisions at s=13 TeV using the ALICE experiment. Thanks to the large number of accumulated minimum bias events, it has been possible to measure (anti-)deuteron production in pp collisions up to the same charged particle multiplicity (d Nch/ d η∼ 26) as measured in p–Pb collisions at similar centre-of-mass energies. Within the uncertainties, the deuteron yield in pp collisions resembles the one in p–Pb interactions, suggesting a common formation mechanism behind the production of light nuclei in hadronic interactions. In this context the measurements are compared with the expectations of coalescence and statistical hadronisation models (SHM).
- ПубликацияОткрытый доступCharged jet cross section and fragmentation in proton-proton collisions at s =7 TeV(2019) Acharya, S.; Adamova, D.; Adler, A.; Adolfsson, J.; 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 Александрович© 2019 CERN, for the ALICE Collaboration. Published by the American Physical Society under the terms of the »https://creativecommons.org/licenses/by/4.0/» Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. We report the differential charged jet cross section and jet fragmentation distributions measured with the ALICE detector in proton-proton collisions at a center-of-mass energy s=7 TeV. Jets with pseudorapidity |η|<0.5 are reconstructed from charged particles using the anti-kT jet-finding algorithm with a resolution parameter R=0.4. The jet cross section is measured in the transverse momentum interval 5≤pTch jet<100 GeV/c. Jet fragmentation is studied measuring the scaled transverse momentum spectra of the charged constituents of jets in four intervals of jet transverse momentum between 5 and 30 GeV/c. The measurements are compared to calculations from the pythia model as well as next-to-leading-order perturbative QCD calculations with powheg+pythia8. The charged jet cross section is well described by powheg for the entire measured range of pTch jet. For pTch jet>40 GeV/c, the pythia calculations also agree with the measured charged jet cross section. pythia6 simulations describe the fragmentation distributions to 15%. Larger discrepancies are observed for pythia8.
- ПубликацияОткрытый доступϒ suppression at forward rapidity in Pb–Pb collisions at sNN=5.02TeV(2019) Acharya, S.; Acosta, F. T.; Adamova, D.; Adolfsson, J.; 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 Александрович© 2018 Inclusive ϒ(1S) and ϒ(2S) production have been measured in Pb–Pb collisions at the centre-of-mass energy per nucleon–nucleon pair sNN=5.02 TeV, using the ALICE detector at the CERN LHC. The ϒ mesons are reconstructed in the centre-of-mass rapidity interval 2.5
- ПубликацияОткрытый доступCentrality and transverse momentum dependence of inclusive J/ψ production at midrapidity in Pb–Pb collisions at sNN=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 Александрович
- ПубликацияОткрытый доступStudy of J/psi azimuthal anisotropy at forward rapidity in Pb-Pb collisions at root s(NN)=5.02 TeV(2019) Acharya, S.; Acosta, F. T.; Adamova, D.; Adler, A.; Belyaev, V.; Bogdanov, A.; Bolozdynya, 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 second (v(2)) and third (v(3)) flow harmonic coefficients of J/ mesons are measured at forward rapidity (2.5 < y < 4.0) in Pb-Pb collisions at sNN=5.02 TeV with the ALICE detector at the LHC. Results are obtained with the scalar product method and reported as a function of transverse momentum, p(T), for various collision centralities. A positive value of J/ v(3) is observed with 3.7 sigma significance. The measurements, compared to those of prompt D-0 mesons and charged particles at mid-rapidity, indicate an ordering with v(n)(J/) < v(n)(D-0) < v(n)(h(+/-)) (n = 2, 3) at low and intermediate p(T) up to 6 GeV/c and a convergence with v(2)(J/) approximate to v(2)(D-0) approximate to v(2)(h(+/-)) at high p(T) above 6-8 GeV/c. In semi-central collisions (5-40% and 10-50% centrality intervals) at intermediate p(T) between 2 and 6 GeV/c, the ratio v(3)/v(2) of J/ mesons is found to be significantly lower (4.6 sigma) with respect to that of charged particles. In addition, the comparison to the prompt D-0-meson ratio in the same p(T) interval suggests an ordering similar to that of the v(2) and v(3) coefficients. The J/ v(2) coefficient is further studied using the Event Shape Engineering technique. The obtained results are found to be compatible with the expected variations of the eccentricity of the initial-state geometry.
- ПубликацияОткрытый доступMeasurement of Λ (1520) production in pp collisions at √s=7TeV and p–Pb collisions at √sNN=5.02TeV(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, CERN for the benefit of the ALICE collaboration.The production of the Λ (1520) baryonic resonance has been measured at midrapidity in inelastic pp collisions at s=7TeV and in p–Pb collisions at sNN=5.02TeV for non-single diffractive events and in multiplicity classes. The resonance is reconstructed through its hadronic decay channel Λ (1520) → pK - and the charge conjugate with the ALICE detector. The integrated yields and mean transverse momenta are calculated from the measured transverse momentum distributions in pp and p–Pb collisions. The mean transverse momenta follow mass ordering as previously observed for other hyperons in the same collision systems. A Blast-Wave function constrained by other light hadrons (π, K, KS0, p, Λ) describes the shape of the Λ (1520) transverse momentum distribution up to 3.5GeV/c in p–Pb collisions. In the framework of this model, this observation suggests that the Λ (1520) resonance participates in the same collective radial flow as other light hadrons. The ratio of the yield of Λ (1520) to the yield of the ground state particle Λ remains constant as a function of charged-particle multiplicity, suggesting that there is no net effect of the hadronic phase in p–Pb collisions on the Λ (1520) yield.
- ПубликацияТолько метаданныеMeasurements of heavy-flavour correlations and jets with ALICE at the LHC(2019) Trzeciak, 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 АлександровичIn this work, the latest heavy-flavour correlation and jet measurements at mid-rapidity with the ALICE detector in pp, p-Pb and Pb-Pb collisions from the LHC Run 2 are reported. In particular, the results of azimuthal correlation measurements of D mesons with charged particles in pp collisions at root s = 13 TeV and in p-Pb collisions at root S-NN = 5.02 TeV are presented. Studies on the centrality-dependent azimuthal correlations of heavy-flavour hadron decay electrons with charged particles in Pb Pb collisions at root S-NN = 5.02 TeV are shown. In addition, measurements of D-meson tagged jet production in pp collisions at root s = 7 TeV and in p Pb collisions at root S-NN = 5.02 TeV are presented, including studies in pp collisions of the jet momentum fraction carried by the D meson. A first result on the D-meson tagged jet nuclear modification factor in central Pb Pb collisions at root S-NN = 5.02 TeV is also reported.
- 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.].