Персона: Парфенов, Петр Евгеньевич
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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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Петр Евгеньевич
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- ПубликацияТолько метаданныеMethods for anisotropic flow measurements with the MPD Experiment at NICA(2020) Idrisov, D.; Luong, V. B.; Taranenko, A.; Parfenov, P.; Demanov, A.; Truttse, A.; Идрисов, Дим Маратович; Тараненко, Аркадий Владимирович; Парфенов, Петр Евгеньевич; Деманов, Александр Евгеньевич; Трутце, Антон Андреевич© 2020 Institute of Physics Publishing. All rights reserved.The anisotropic collective flow is one of the important observable values sensitive to transport properties of strongly interacting matter created in relativistic heavy-ion collisions. The performance of Multi-Purpose Detector (MPD) at NICA collider for elliptic flow measurements with Monte-Carlo simulations using collisions of Au+Au and Bi+Bi ions employing several state of the art event generators is studied. Different methods for flow measurements as event plane and direct cumulants are used to investigate the contribution of non-flow correlations and flow fluctuations.
- ПубликацияТолько метаданныеComparison of methods for elliptic flow measurements at NICA energies S N N = 4 - 11 Gev(2021) Luong, V. B.; Idrisov, D.; Parfenov, P.; Taranenko, A.; Demanov, A.; Идрисов, Дим Маратович; Парфенов, Петр Евгеньевич; Тараненко, Аркадий Владимирович; Деманов, Александр Евгеньевич© 2021 Author(s).The goal of the Multi-Purpose Detector (MPD) experiment at NICA collider is to explore the QCD phase diagram of strongly interacting matter produced in nucleus-nucleus collisions at SNN=4-11 Gev. The performance of MPD detector for elliptic flow measurements of charged hadrons is studied with Monte-Carlo simulations using collisions of Au+Au ions employing UrQMD, SMASH, and AMPT heavy-ion event generators. Different methods for flow measurements: event plane and direct cumulants are used to investigate the contribution of non-flow correlations and flow fluctuations.
- ПубликацияТолько метаданныеGlobal Lambda-hyperon polarization in Au plus Au collisions at root S-NN=3 GeV(2021) Abdallah, M. S.; Aboona, B. E.; Adam, J.; Adamczyk, L.; Alekseev, I.; Brandin, A. V.; Khyzhniak, Y. V.; Kochenda, L.; Kravtsov, P.; Nigmatkulov, G.; Okorokov, V. A.; Parfenov, P.; Strikhanov, M.; Taranenko, A.; Алексеев, Игорь Геннадьевич; Брандин, Андрей Владимирович; Нигматкулов, Григорий Александрович; Окороков, Виталий Алексеевич; Парфенов, Петр Евгеньевич; Стриханов, Михаил Николаевич; Тараненко, Аркадий ВладимировичGlobal hyperon polarization, (P) over barH, in Au + Au collisions over a large range of collision energy, root S-NN, was recently measured and successfully reproduced by hydrodynamic and transport models with intense fluid vorticity of the quark-gluon plasma. While naive extrapolation of data trends suggests a large (P) over barH as the collision energy is reduced, the behavior of (P) over barH at small root S-NN < 7.7 GeV is unknown. Operating the STAR experiment in fixed-target mode, we measured the polarization of Lambda hyperons along the direction of global angular momentum in Au + Au collisions at root S-NN = 3 GeV. The observation of substantial polarization of 4.91 +/- 0.81(stat.) +/- 0.15(syst.)% in these collisions may require a reexamination of the viscosity of any fluid created in the collision, of the thermalization timescale of rotational modes, and of hadronic mechanisms to produce global polarization.
- ПубликацияТолько метаданныеMeasurement of the Sixth-Order Cumulant of Net-Proton Multiplicity Distributions in Au plus Au Collisions at root S-NN=27, 54.4, and 200 GeV at RHIC(2021) Abdallah, M. S.; Adam, J.; Adamczyk, L.; Adams, J. R.; Alekseev, I.; Brandin, A. V.; Khyzhniak, Y. V.; Kochenda, L.; Kravtsov, P.; Nigmatkulov, G.; Okorokov, V. A.; Parfenov, P.; Strikhanov, M.; Taranenko, A.; Алексеев, Игорь Геннадьевич; Брандин, Андрей Владимирович; Нигматкулов, Григорий Александрович; Окороков, Виталий Алексеевич; Парфенов, Петр Евгеньевич; Стриханов, Михаил Николаевич; Тараненко, Аркадий ВладимировичAccording to first-principle lattice QCD calculations, the transition from quark-gluon plasma to hadronic matter is a smooth crossover in the region mu(B) <= T-c. In this range the ratio, C-6/C-2, of net-baryon distributions are predicted to be negative. In this Letter, we report the first measurement of the midrapidity net-proton C-6/C-2 from 27, 54.4, and 200 GeV Au + Au collisions at the Relativistic Heavy Ion Collider (RHIC). The dependence on collision centrality and kinematic acceptance in (p(T) , y) are analyzed. While for 27 and 54.4 GeV collisions the C-6/C-2 values are close to zero within uncertainties, it is observed that for 200 GeV collisions, the C-6/C-2 ratio becomes progressively negative from peripheral to central collisions. Transport model calculations without critical dynamics predict mostly positive values except for the most central collisions within uncertainties. These observations seem to favor a smooth crossover in the high-energy nuclear collisions at top RHIC energy.
- ПубликацияТолько метаданныеInvariant jet mass measurements in pp collisions at s =200 GeV at RHIC(2021) Abdallah, M. S.; Adam, J.; Adamczyk, L.; Adams, J. R.; Alekseev, I.; Brandin, A. V.; Khyzhniak, Y. V.; Kochenda, L.; Kravtsov, P.; Nigmatkulov, G.; Okorokov, V. A.; Parfenov, P.; Strikhanov, M.; Taranenko, A.; Алексеев, Игорь Геннадьевич; Брандин, Андрей Владимирович; Нигматкулов, Григорий Александрович; Окороков, Виталий Алексеевич; Парфенов, Петр Евгеньевич; Стриханов, Михаил Николаевич; Тараненко, Аркадий Владимирович© 2021 authors. Published by the American Physical Society. Funded by SCOAP3.We present the first inclusive measurements of the invariant and softdrop jet mass in proton-proton collisions at s=200 GeV at STAR. The measurements are fully corrected for detector effects, and reported differentially in both the jet transverse momentum and jet radius parameter. We compare the measurements to established leading-order Monte Carlo event generators and find that STAR-tuned pythia-6 reproduces the data, while LHC tunes of pythia-8 and herwig-7 do not agree with the data, providing further constraints on parameter tuning. Finally, we observe that softdrop grooming, for which the contribution of wide-angle nonperturbative radiation is suppressed, shifts the jet mass distributions into closer agreement with the partonic jet mass as determined by both pythia-8 and a next-to-leading-logarithmic accuracy perturbative QCD calculation. These measurements complement recent LHC measurements in a different kinematic region, as well as establish a baseline for future jet mass measurements in heavy-ion collisions at RHIC.
- ПубликацияТолько метаданныеFlow and interferometry results from Au+Au collisions at sNN =4.5 GeV(2021) Abdallah, M. S.; Adam, J.; Adamczyk, L.; Adams, J. R.; Alekseev, I.; Brandin, A. V.; Khyzhniak, Y. V.; Kochenda, L.; Kravtsov, P.; Nigmatkulov, G.; Okorokov, V. A.; Parfenov, P.; Strikhanov, M.; Taranenko, A.; Алексеев, Игорь Геннадьевич; Брандин, Андрей Владимирович; Нигматкулов, Григорий Александрович; Окороков, Виталий Алексеевич; Парфенов, Петр Евгеньевич; Стриханов, Михаил Николаевич; Тараненко, Аркадий Владимирович©2021 American Physical Society.The beam energy scan (BES) program at the BNL Relativistic Heavy Ion Collider (RHIC) was extended to energies below sNN=7.7 GeV in 2015 by successful implementation of the fixed-target mode of operation in the STAR (Solenoidal Tracker At RHIC) experiment. In this mode, ions circulate in one ring of the collider and interact with a stationary target at the entrance of the STAR time projection chamber. The first results for Au+Au collisions at sNN=4.5 GeV are presented, demonstrating good performance of all the relevant detector subsystems in fixed-target mode. Results presented here include directed and elliptic flow of identified hadrons, and radii from pion femtoscopy. The latter, together with recent HADES results, reveal a long-sought peak structure that may be caused by the system evolving through a first-order phase transition from quark-gluon plasma to the hadronic phase. Directed and elliptic flow for pions are presented for the first time at this beam energy. Pion and proton elliptic flow show behavior which hints at constituent quark scaling, and demonstrate that a definitive conclusion will be achievable using the full statistics of the ongoing second phase of BES (BES-II). In particular, BES-II to date has recorded fixed-target data sets with two orders of magnitude more events at each of nine energies between sNN=3.0 and 7.7 GeV.
- ПубликацияТолько метаданныеMethods for Elliptic Flow Measurements with the MPD Experiment at NICA(2021) Geraksiev, N.; Idrisov, D.; Luong, V. B.; Demanov, A.; Parfenov, P.; Taranenko, A.; Truttse, A.; Volodikhin, E.; Идрисов, Дим Маратович; Деманов, Александр Евгеньевич; Парфенов, Петр Евгеньевич; Тараненко, Аркадий Владимирович; Трутце, Антон Андреевич; Володихин, Евгений Андреевич© 2021, Pleiades Publishing, Ltd.Abstract: The anisotropic collective flow is one of the important observables sensitive to the transport properties of strongly interacting matter created in relativistic heavy-ion collisions. The performance of the multi-purpose detector (MPD) at NICA collider for elliptic flow measurements of identified charged pions, protons, Ks(0) and particles is studied with Monte Carlo simulations using collisions of Au + Au ions employing the UrQMD event generator. Different methods for flow measurements: event plane and direct cumulants are used to investigate the contribution of non-flow correlations and flow fluctuations.
- ПубликацияТолько метаданныеPerformance for Directed Flow Measurements of the MPD Experiment at NICA Collider(2021) Geraksiev, N.; Kireyeu, V.; Blau, D.; Parfenov, P.; Taranenko, A.; Idrisov, D.; Luong, V. B.; Demanov, A.; Kashirin, E.; Truttse, A.; Volodikhin, E.; Парфенов, Петр Евгеньевич; Тараненко, Аркадий Владимирович; Идрисов, Дим Маратович; Деманов, Александр Евгеньевич; Трутце, Антон Андреевич; Володихин, Евгений Андреевич© 2021, Pleiades Publishing, Ltd.Abstract: Investigations of the quark–gluon matter properties at high net-baryon densities are the primary scientific mission of the MPD (multi-purpose detector) at the accelerator facility Nuclotron-NICA. In this work, the performance of the MPD detector for directed flow measurements is studied with Monte Carlo simulations of heavy-ion collisions at energies √sNN = 4–11 GeV.
- ПубликацияТолько метаданныеAzimuthal anisotropy measurements of strange and multistrange hadrons in U+ U collisions at sNN =193 GeV at the BNL Relativistic Heavy Ion Collider(2021) Abdallah, M. S.; Adam, J.; Adamczyk, L.; Adams, J. R.; Alekseev, I.; Brandin, A. V.; Khyzhniak, Y. V.; Kochenda, L.; Kravtsov, P.; Nigmatkulov, G.; Okorokov, V. A.; Parfenov, P.; Strikhanov, M.; Taranenko, A.; Алексеев, Игорь Геннадьевич; Брандин, Андрей Владимирович; Нигматкулов, Григорий Александрович; Окороков, Виталий Алексеевич; Парфенов, Петр Евгеньевич; Стриханов, Михаил Николаевич; Тараненко, Аркадий Владимирович© 2021 American Physical Society.We present systematic measurements of azimuthal anisotropy for strange and multistrange hadrons (Ks0, Λ, Ξ, and ω) and φ mesons at midrapidity (|y|< 1.0) in collisions of U+U nuclei at sNN=193 GeV, recorded by the STAR detector at the Relativistic Heavy Ion Collider. Transverse momentum (pT) dependence of flow coefficients (v2, v3, and v4) is presented for minimum bias collisions and three different centrality intervals. Number of constituent quark scaling of the measured flow coefficients in U+U collisions is discussed. We also present the ratio of vn scaled by the participant eccentricity (ɛn2) to explore system size dependence and collectivity in U+U collisions. The magnitude of v2/ɛ2 is found to be smaller in U+U collisions than that in central Au+Au collisions contradicting naive eccentricity scaling. Furthermore, the ratios between various flow harmonics (v3/v23/2, v4/v24/2) are studied and compared with hydrodynamic and transport model calculations.
- ПубликацияТолько метаданныеCentrality determination in heavy-Ion collisions with MPD detector at NICA(2021) Parfenov, P.; Segal, I.; Idrisov, D.; Luong, V. B.; Taranenko, A.; Demanov, A.; Truttse, A.; Volodikhin, E.; Парфенов, Петр Евгеньевич; Сегаль, Илья Вадимович; Идрисов, Дим Маратович; Тараненко, Аркадий Владимирович; Деманов, Александр Евгеньевич; Трутце, Антон Андреевич; Володихин, Евгений Андреевич© 2021 Jagellonian University. All rights reserved.Centrality is a key parameter for defining the collision system size in relativistic heavy-ion collisions. The centrality determination provides a tool for comparing the anticipated measurements with Multi-Purpose Detector (MPD) at NICA with those of other experiments and with theoretical calculations. The performance for collision centrality determination in MPD experiment using the multiplicity of produced particles is presented.