期刊：
Physica A-Statistical Mechanics and its Applications,2024年637:129533 ISSN：0378-4371
通讯作者：
Liu, FY
作者机构：
[Yang, Chunbin; Liu, Feiyi; Deng, Weibing; Li, Wei; Chen, Xiangna; Liu, FY] Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Peoples R China.;[Liu, Feiyi; Deng, Weibing; Li, Wei; Liu, FY] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.;[Liu, Feiyi; Papp, Gabor; Liu, FY] Eotv Lorand Univ, Inst Phys, 1-A Pazmany P Setany, H-1117 Budapest, Hungary.;[Chen, Shiyang] Baoshan Univ, Sch Engn & Technol, Baoshan 678000, Peoples R China.;[Shen, Jianmin] Max Planck Inst Math Sci, D-04103 Leipzig, Germany.
通讯机构：
[Liu, FY ] C;Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Peoples R China.;Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.;Eotv Lorand Univ, Inst Phys, 1-A Pazmany P Setany, H-1117 Budapest, Hungary.
摘要：
Machine learning techniques exhibit significant performance in discriminating different phases of matter and provide a new avenue for studying phase transitions. We investigate the phase transitions of three dimensional q -state Potts model on cubic lattice by using a transfer learning approach, Domain Adversarial Neural Network (DANN). With the unique neural network architecture, it could evaluate the high -temperature (disordered) and low -temperature (ordered) phases, and identify the first and second order phase transitions. Meanwhile, by training the DANN with a few labeled configurations, the critical points for q = 2, 3, 4 and 5 can be predicted with high accuracy, which are consistent with those of the Monte Carlo simulations. These findings would promote us to learn and explore the properties of phase transitions in high -dimensional systems.
期刊：
Physica A-Statistical Mechanics and its Applications,2023年617:128666 ISSN：0378-4371
通讯作者：
Liu, FY
作者机构：
[Yang, Chunbin; Liu, Feiyi; Chen, Shiyang; Deng, Weibing; Li, Wei; Chen, Xiangna; Liu, FY] Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Peoples R China.;[Yang, Chunbin; Liu, Feiyi; Chen, Shiyang; Deng, Weibing; Li, Wei; Chen, Xiangna; Liu, FY] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.;[Liu, Feiyi; Papp, Gabor; Liu, FY] Eotvos Lorand Univ, Inst Phys, 1-A Pazmany P Setany, H-1117 Budapest, Hungary.;[Li, Wei] Max Planck Inst Math Sci, D-04103 Leipzig, Germany.;[Shen, Jianmin] Baoshan Univ, Sch Engn & Technol, Baoshan 678000, Peoples R China.
通讯机构：
[Liu, FY ] C;Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Peoples R China.;Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.;Eotvos Lorand Univ, Inst Phys, 1-A Pazmany P Setany, H-1117 Budapest, Hungary.
摘要：
A transfer learning method, Domain Adversarial Neural Network (DANN), is introduced to study the phase transition of two-dimensional q-state Potts model. With the DANN, we only need to choose a few labeled configurations automatically as input data, then the critical points can be obtained after training the algorithm. By an additional iterative process, the critical points can be captured to comparable accuracy to Monte Carlo simulations as we demonstrate it for q = 3,4, 5, 7 and 10. The type of phase transition (first or second-order) is also determined at the same time. Meanwhile, for the second -order phase transition at q = 3, we can calculate the critical exponent & nu; by data collapse. Furthermore, compared to the traditional supervised learning, we found the DANN to be more accurate with lower cost.& COPY; 2023 Elsevier B.V. All rights reserved.
作者：
Jing, Jing;Jiang, Ze-Fang;Yang, C. B.;Zhang, Ben-Wei
期刊：
中国物理C,2023年47(3):034104 ISSN：1674-1137
作者机构：
[Jing, Jing; Jiang, Ze-Fang] Hubei Engn Univ, Dept Phys & Elect Informat Engn, Xiaogan 432000, Peoples R China.;[Yang, C. B.; Zhang, Ben-Wei; Jiang, Ze-Fang] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.;[Yang, C. B.; Zhang, Ben-Wei; Jiang, Ze-Fang] Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Peoples R China.
关键词：
directed flow;heavy ion collisions;isobar Ru and Zr;quark-gluon plasma
摘要：
<jats:title>Abstract</jats:title>
<jats:p>Using a (3+1)-D hydrodynamic model, CLVisc, we study the directed flow (<jats:inline-formula>
<jats:tex-math><?CDATA $ v_{1} $?></jats:tex-math>
<jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_47_3_034104_M2.jpg" xlink:type="simple" />
</jats:inline-formula>) of light hadrons produced in Au+Au, Ru+Ru, and Zr+Zr collisions at <jats:inline-formula>
<jats:tex-math><?CDATA $\sqrt{s_{NN}}=$?></jats:tex-math>
<jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_47_3_034104_M3.jpg" xlink:type="simple" />
</jats:inline-formula> 200 GeV. The evolution of tilted energy density, pressure gradient, and radial flow along the <jats:italic>x</jats:italic>-direction is systematically investigated. The counter-clockwise tilt of the initial fireball is shown to be a vital source of directed flow for final light hadrons. A good description of directed flow is provided for light hadrons in central and mid-central Au+Au and isobar collisions at the RHIC. Our numerical results show a clear system size dependence for light hadron <jats:inline-formula>
<jats:tex-math><?CDATA $ v_{1} $?></jats:tex-math>
<jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_47_3_034104_M4.jpg" xlink:type="simple" />
</jats:inline-formula> across different collision systems. We further study the effect of nuclear structure on the directed flow and find that <jats:inline-formula>
<jats:tex-math><?CDATA $ v_{1} $?></jats:tex-math>
<jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_47_3_034104_M5.jpg" xlink:type="simple" />
</jats:inline-formula> for light hadrons is insensitive to nuclei with quadrupole deformation.</jats:p>
作者机构：
[Yang, C. B.; Wu, Xiang-Yu; Zhang, Ben-Wei; Jiang, Ze-Fang; Jiang, ZF] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Hubei, Peoples R China.;[Yang, C. B.; Wu, Xiang-Yu; Zhang, Ben-Wei; Jiang, Ze-Fang; Jiang, ZF] Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Hubei, Peoples R China.;[Jiang, Ze-Fang; Jiang, ZF] Hubei Engn Univ, Dept Phys & Elect Informat Engn, Xiaogan 432000, Hubei, Peoples R China.;[Cao, Shanshan] Shandong Univ, Inst Frontier & Interdisciplinary Sci, Qingdao 266237, Shandong, Peoples R China.
通讯机构：
[Jiang, ZF ] C;Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Hubei, Peoples R China.;Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Hubei, Peoples R China.;Hubei Engn Univ, Dept Phys & Elect Informat Engn, Xiaogan 432000, Hubei, Peoples R China.
摘要：
We study the origin of the directed flow of charged particles produced in relativistic heavy-ion collisions. Three different initial conditions, Bozėk -Wyskiel, CCNU, and Shen-Alzhrani, of energy density distributions are coupled to the (3+1) -dimensional viscous hydrodynamic model CLVisc, and their effects on the development of the anisotropic medium geometry, pressure gradient, and radial flow are systematically compared. By comparison to experimental data at both the Relativistic Heavy-Ion Collider and the Large Hadron Collider, we find that the directed flow provides a unique constraint on the tilt of the initial medium profile in the plane spanned by the impact parameter and space-time rapidity. Within midrapidity, the counterclockwise tilt is shown to be a crucial source of the positive-negative force by the pressure gradient along the impact parameter (x) direction at backward-forward rapidity, which drives a negative slope of the x component of the medium flow velocity with respect to rapidity, and in the end the same feature of the charged particle directed flow.
作者机构：
[Yang, Chunbin; Liu, Feiyi; Chen, Shiyang; Shen, Jianmin; Li, Wei; Chen, Xiangna; Xu, Dian] Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Peoples R China.;[Yang, Chunbin; Liu, Feiyi; Chen, Shiyang; Shen, Jianmin; Li, Wei; Chen, Xiangna; Xu, Dian] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.;[Liu, Feiyi; Papp, Gabor] Eotvos Lorand Univ, Inst Phys, 1-A Pazmany P Setany, H-1117 Budapest, Hungary.;[Deng, Shengfeng] Ctr Energy Res, Inst Tech Phys & Mat Sci, H-1121 Budapest, Hungary.;[Li, Wei] Max Planck Inst Math Sci, D-04103 Leipzig, Germany.
摘要：
The latest advances of statistical physics have shown remarkable performance of machine learning in identifying phase transitions. In this paper, we apply domain adversarial neural network (DANN) based on transfer learning to studying nonequilibrium and equilibrium phase transition models, which are percolation model and directed percolation (DP) model, respectively. With the DANN, only a small fraction of input configurations (two-dimensional images) needs to be labeled, which is automatically chosen, to capture the critical point. To learn the DP model, the method is refined by an iterative procedure in determining the critical point, which is a prerequisite for the data collapse in calculating the critical exponent ?????. We then apply the DANN to a two-dimensional site percolation with configurations filtered to include only the largest cluster which may contain the information related to the order parameter. The DANN learning of both models yields reliable results which are comparable to the ones from Monte Carlo simulations. Our study also shows that the DANN can achieve quite high accuracy at much lower cost, compared to the supervised learning.
作者机构：
[Peng, Qi; Jiang, Ze-Fang] Hubei Engn Univ, Dept Phys & Elect Informat Engn, Xiaogan 432000, Peoples R China.;[Yang, C. B.; Jiang, Ze-Fang] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.;[Yang, C. B.; Jiang, Ze-Fang] Minist Educ MOE, Key Lab Quark & Lepton Phys, Wuhan 430079, Peoples R China.
通讯机构：
[Jiang, Ze-Fang] H;[Jiang, Ze-Fang] C;[Jiang, Ze-Fang] M;Hubei Engn Univ, Dept Phys & Elect Informat Engn, Xiaogan 432000, Peoples R China.;Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.
摘要：
Following the Bożek-Wyskiel parametrization tilted initial condition, an alternative way to construct a longitudinal tilted fireball based on the Glauber collision geometry is presented. This longitudinal tilted initial condition combined with the Ideal-CLVisc (3+1)D hydrodynamic model, a nonvanishing directed flow coefficient v1 in a wide range is observed. After comparing the model's results with experimentally observed data of directed flow coefficient v1(η) from sNN=200GeV Cu+Cu, Au+Au collisions at RHIC energy to sNN=2.76TeV and sNN=5.02TeV Pb+Pb collisions at the LHC energy. One finds that directed flow measurements in heavy-ion collisions can set strong constraints on the imbalance of forward and backward incoming nuclei and on the magnitude asymmetry of pressure gradients along the x direction.
作者机构：
[Sa, Ben-Hao; Yan, Yu-Liang] China Inst Atom Energy, POB 275 10, Beijing 102413, Peoples R China.;[Zhou, Dai-Mei; Yang, Chunbin; Sa, Ben-Hao; Yan, Yu-Liang; Cai, Xu] Cent China Normal Univ, Key Lab Quark & Lepton Phys, MOE, Wuhan 430079, Peoples R China.;[Zhou, Dai-Mei; Yang, Chunbin; Sa, Ben-Hao; Yan, Yu-Liang; Cai, Xu] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.;[Limphirat, Ayut; Yan, Yupeng] Suranaree Univ Technol, Sch Phys, Nakhon Ratchasima 30000, Thailand.;[Limphirat, Ayut; Yan, Yupeng] Suranaree Univ Technol, Ctr Excellence High Energy Phys & Astrophys, Nakhon Ratchasima 30000, Thailand.
通讯机构：
[Yan, Yu-Liang] C;China Inst Atom Energy, POB 275 10, Beijing 102413, Peoples R China.;Cent China Normal Univ, Key Lab Quark & Lepton Phys, MOE, Wuhan 430079, Peoples R China.;Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.
关键词：
pp collisions;jet;anti-kt algorithm;PYTHIA model;pp collisions;jet;anti-kt algorithm;PYTHIA model
摘要：
We propose a forward method based on PYTHIA6.4 to study the jet properties in ultra-relativistic pp collisions.In the forward method,the partonic initial states are first generated with PYTHIA6.4 and then hadronized in the Lund string fragmentation model,and finally the hadronic jets are constructed from the created hadrons.Jet properties calculated with the forward method for pp collisions at √s=7 TeV are comparable to those calculated with the usual anti-kt algorithm (backward method) in PYTHIA6.4.The comparison between the backward and forward methods may contribute to the understanding of the partonic origin of jets in the backward method.
摘要：
Scaled factorial moment analysis for the multiplicity distribu- tions of shower particles in the pseudorapidity phase space has been done. An evidence for the presence of dynamical uctuations has been shown for the non-peripheral interactions of28Si+Ag(Br) at 14.6 A GeV/c and 4.5 A GeV/c.The results have been compared with the values obtained from data sample calculated by cascade-evaporation model.
期刊：
EUROPEAN PHYSICAL JOURNAL A,1999年5(4):429-440 ISSN：1434-6001
通讯作者：
Adamovich, MI
作者机构：
PN Lebedev Phys Inst, Moscow 117924, Russia.;Inst High Energy Phys, Alma Ata, Kazakhstan.;Acad Sinica, Inst High Energy Phys, Beijing, Peoples R China.;Inst Space Sci, Bucharest, Romania.;Panjab Univ, Dept Phys, Chandigarh 160014, India.
摘要：
The experimental data on the interactions of 10.6A GeV gold nuclei in nuclear emulsions are analyzed with particular emphasis of target separation interactions and study of critical exponents. Charged fragment moments, conditional moments as well as two and three – body asymmetries of the fast moving projectile particles are determined in terms of the total charge remaining bound in the multiply charged projectile fragments. Some differences in the average yields of helium nuclei and heavier fragments are observed, which may be attributed to a target effect. However, two and three-body asymmetries and conditional moments indicate that the breakup mechanism of the projectile seems to be independent of target mass. We looked for evidence of critical point observable in finite nuclei by study the resulting charged fragments distributions. We have obtained the values for the critical exponents γ, β and τ and compare our results with those at lower energy experiment (1.0A GeV data). The values suggest that a phase transition like behavior, is observed.
摘要：
The nuclear emulsion was exposed at CERN by the lead projectile at 160 A GeV. The angles between any pair of fragments with Z = 2 - 4 have been measured in the emulsion plane for the events which did not contain heavy fragments. The constant characterizing the normal angle (cp) distribution of the fragment momentum projection onto the emulsion plane with respect to initial projectile momentum Po is found to be sigma(phi) = (0.37 +/- 0.02) mrad. Corresponding value sigma(o) = (121 +/- 6) MeV/c of nucleon momentum distribution in the lead nucleus coincides with that expected from Fermi momentum distribution for this nucleus. The peak in the pair-angle distribution of double-charged fragments, Be-8 --> 2 alpha, is presented for the region of small angles (< 0.1 mrad). The fraction of alpha-particles coming from the decay of the ground state Be-8 is found to be (13 +/- 2)% of their whole number.
会议名称：
XXVIIth International Symposium on Multiparticle Dynamics
会议时间：
SEP 08-12, 1997
会议地点：
INFN, NATL LABS, FRASCATI, ITALY
会议主办单位：
PN Lebedev Phys Inst, Moscow 117924, Russia.^High Energy Phys Inst, Almaty, Kazakhstan.^Acad Sinica, Inst High Energy Phys, Beijing, Peoples R China.^Panjab Univ, Dept Phys, Chandigarh 160014, India.^Hunan Educ Inst, Dept Phys, Changsha, Hunan, Peoples R China.^Joint Nucl Res Inst, Dubna, Russia.^Univ Rajasthan, Dept Phys, Jaipur 302004, Rajasthan, India.^Univ Jammu, Dept Phys, Jammu 180004, India.^Safarik Univ, Dept Nucl Phys & Biophys, Kosice, Slovakia.^Shanxi Normal Univ, Dept Phys, Linfen, Shanxi, Peoples R China.^Univ Lund, Dept Phys, Lund, Sweden.^Univ Marburg, Fachbereich Phys, D-3550 Marburg, Germany.^Univ Washington, Dept Phys, Seattle, WA 98195 USA.^Inst Phys Nucl, Tashkent, Uzbekistan.^Phys Tech Inst, Tashkent, Uzbekistan.^Huazhong Normal Univ, Inst Particle Phys, Wuhan, Hubei, Peoples R China.^St Petersburg Nucl Phys Inst, St Petersburg, Russia.
摘要：
Angular distributions of charged particles produced in O-16 and S-32 collisions with nuclear track emulsion were studied at momenta 4.5 and 200 A GeV/c. Comparison with the angular distributions of charged particles produced in proton-nucleus collisions at the same momentum allows to draw the conclusion, that the angular distributions in nucleus-nucleus collisions can be seen as superposition of the angular distributions in nucleon-nucleus collisions taken at the same impact parameter b(NA), that is mean impact parameter between the participating projectile nucleons and the center of the target nucleus.
摘要：
The complete charge distribution of products from Au nuclei fragmenting in nuclear emulsion at 10.7A GeV has been measured. Multiplicities of produced particles and particles associated with the target source are used to select peripheral and central events. A statistical analysis, based on event-by-event charge distributions, show that a population of subcritical, critical and supercritical events, i.e. a phase transition like behaviour, is observed among peripheral collisions.
摘要：
Using emulsion detectors a transverse-momentum analysis of projectile fragments has been performed in Au induced nuclear interactions at 11.6 A GeV/c. Evidence for collective flow of the projectile fragments has been obtained. Angular distributions of the principal vectors of projectile and target fragments have shown strong azimuthal correlation.
作者机构：
[Adamovich, MI] Inst High Energy Phys, Alma Ata, Kazakhstan.;Acad Sinica, Inst High Energy Phys, Beijing, Peoples R China.;Inst Gravitat & Space Res, Bucharest, Romania.;Panjab Univ, Dept Phys, Chandigarh 160014, India.;Hunan Educ Inst, Dept Phys, Changsha, Hunan, Peoples R China.
通讯机构：
[Adamovich, MI] I;Inst High Energy Phys, Alma Ata, Kazakhstan.
摘要：
We analyse the multifractal structure of moments G(q) in terms of a new variable X on data of (197)AU, S-32, and O-16 induced interactions with emulsion nuclei and Monte Carlo generated samples. The dynamical properties of the produced particles are mapped onto multifractal spectra. We compare In(G) in experimental data of Au-197, S-32, and O-16 with pure statistical fluctuations. It is shown that the stochasticity plays an important role for the G-moments.
作者机构：
ACAD SINICA, INST HIGH ENERGY PHYS, BEIJING, PEOPLES R CHINA.;INST GRAVITAT & SPACE RES, BUCHAREST, ROMANIA.;PANJAB UNIV, DEPT PHYS, CHANDIGARH 160014, INDIA.;HUNAN EDUC INST, DEPT PHYS, CHANGSHA, HUNAN, PEOPLES R CHINA.;JOINT INST NUCL RES DUBNA, LAB HIGH ENERGIES, DUBNA, RUSSIA.
通讯机构：
[Adamovich, MI] I;INST HIGH ENERGY PHYS, ALMATY, KAZAKHSTAN.
摘要：
Angular distributions of projectile-associated He fragments from Pb induced reactions on stationary Pb target at 158 A GeV/c incident momentum are reported. The precision of the angular measurements was about ±0.01 mrad. Two emission components are appearing in the projected angular spectra of the He particles, one representing fragmentation at Fermi momentum scale, while the other one exhibits large transverse momentum transfer. By scaling with the incident momentum the angular spectra of He particles are compared with earlier reported measurements of Au on Au interactions at 11.6 A GeV/c. The pT spectrum of the He particles appears the same for the two cases.
期刊：
EUROPEAN PHYSICAL JOURNAL A,1997年358(3):337-351 ISSN：1434-6001
通讯作者：
Adamovich, MI
作者机构：
INST HIGH ENERGY PHYS,ALMATY,KAZAKHSTAN.;ACAD SINICA,INST HIGH ENERGY PHYS,BEIJING,PEOPLES R CHINA.;PANJAB UNIV,DEPT PHYS,CHANDIGARH 160014,INDIA.;HUNAN EDUC INST,DEPT PHYS,CHANGSHA,PEOPLES R CHINA.;JOINT INST NUCL RES,LAB COMP TECH,DUBNA,RUSSIA.
摘要：
Complex analysis of Gold interaction with photoemulsion nuclei at 10.7 GeV/nucleon has been performed. The data obtained were compared with a modified FRITIOF model which allowance is made for exitation of nuclear residuals (after interaction). A comparison was also made with cascade-evaporation model. Experimental data contradict the CEM supposition of fast resonance decay and complete cascading. The modified FRITIOF model fairly well reproduces experimental observations. According to the model the production mechanism of charged particles must remain unchangable in the 4-200 GeV/n energy range.
期刊：
EUROPEAN PHYSICAL JOURNAL C,1997年76(4):659-663 ISSN：1434-6044
通讯作者：
Adamovich, MI
作者机构：
PN Lebedev Phys Inst, Moscow 117924, Russia.;Inst High Energy Phys, KZ-480082 Alma Ata 82, Kazakhstan.;Acad Sinica, Inst High Energy Phys, Beijing 100039, Peoples R China.;Inst Gravitat & Space Res, Bucharest, Romania.;Panjab Univ, Dept Phys, Chandigarh 160014, India.
摘要：
The anomalous behavior of 2-dimensional scaled factorial moments for charged hadrons in nucleus-nucleus collisions is studied in some detail using both mini-bias and central collision data of O-16- and Au-197-Em interactions from EMU01 experiment. The analysis is carried out in terms of Hurst exponents, suggesting the necessity of different partitions in pseudo-rapidity and azimuthal angle. The results can be interpreted tentatively as due to the superposition effect in nucleus-nucleus collisions.
