作者机构：
[Qin, Guang-You; Wu, Xiang-Yu; Wang, Xin-Nian] Cent China Normal Univ, MOE, Key Lab Quark & Lepton Phys, Wuhan 430079, Hubei, Peoples R China.;[Qin, Guang-You; Wu, Xiang-Yu; Wang, Xin-Nian] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Hubei, Peoples R China.;[Wang, Xin-Nian; Pang, Long-Gang] Lawrence Berkeley Natl Lab, Nucl Sci Div, Berkeley, CA 94720 USA.;[Wang, Xin-Nian; Pang, Long-Gang] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA.
通讯机构：
[Wu, Xiang-Yu] C;Cent China Normal Univ, MOE, Key Lab Quark & Lepton Phys, Wuhan 430079, Hubei, Peoples R China.;Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Hubei, Peoples R China.
摘要：
We perform a systematic study on the decorrelation of anisotropic flows along the pseudorapidity in relativistic heavy-ion collisions at the CERN Large Hadron Collider (LHC) and BNL Relativistic Heavy Ion Collider (RHIC) energies. The dynamical evolution of the quark-gluon plasma fireball is simulated via the CLVisc (ideal) ( 3+1)-dimensional hydrodynamics model, with the fully fluctuating initial condition from the A-Multi-Phase-Transport (AMPT) model. A detailed analysis is performed of the longitudinal decorrelations of elliptic, triangular, and quadrangular flows in terms of flow vectors, flow magnitudes, and flow orientations (event planes). It is found that pure flow magnitudes have a smaller longitudinal decorrelation than pure flow orientations, and the decorrelation of flow vectors is a combined effect of both flow magnitudes and orientations. The longitudinal decorrelation of elliptic flow has a strong and nonmonotonic centrality dependence due to the initial elliptic collision geometry: the smallest decorrelation in midcentral collisions. In contrast, the decorrelations of triangular and quadrangular flows have a weak centrality dependence, with slightly larger decorrelations in more peripheral collisions. Our numerical results for Pb + Pb collisions at the LHC are in good agreement with the ATLAS data, while our RHIC results predict much larger longitudinal decorrelations compared to the LHC. We further analyze the longitudinal structures of the AMPT initial conditions and find that the final-state longitudinal decorrelation effects are strongly correlated with the lengths of the initial string structures in the AMPT model. The decorrelation effects are typically larger at lower collision energies and in more peripheral collisions due to the shorter lengths of the string structures in the initial states.
摘要：
A primordial state of matter consisting of free quarks and gluons that existed in the early universe a few microseconds after the Big Bang is also expected to form in high-energy heavy-ion collisions. Determining the equation of state (EoS) of such a primordial matter is the ultimate goal of high-energy heavy-ion experiments. Here we use supervised learning with a deep convolutional neural network to identify the EoS employed in the relativistic hydrodynamic simulations of heavy ion collisions. High-level correlations of particle spectra in transverse momentum and azimuthal angle learned by the network act as an effective EoS-meter in deciphering the nature of the phase transition in quantum chromodynamics. Such EoS-meter is model-independent and insensitive to other simulation inputs including the initial conditions for hydrodynamic simulations.
期刊：
Proceedings of Science,2018年345 ISSN：1824-8039
作者机构：
Key Laboratory of Quark and Lepton Physics (MOE), Institute of Particle Physics, Central China Normal University, Wuhan, 430079, China;Department of Physics and Astronomy, Wayne State University, Detroit, MI 48201, United States;Nuclear Science Division, MS 70R0319, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States
期刊：
Proceedings of Science,2018年345 ISSN：1824-8039
通讯作者：
Wang, X.-N.
作者机构：
Key Laboratory of Quark and Lepton Physics (MOE), Institute of Particle Physics, Central China Normal University, Wuhan, 430079, China;Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States
通讯机构：
Key Laboratory of Quark and Lepton Physics (MOE), Institute of Particle Physics, Central China Normal University, Wuhan, China
会议名称：
16th International Conference on Strangeness in Quark Matter (SQM)
会议时间：
JUN 27-JUL 01, 2016
会议地点：
Univ Calif, Clark Kerr Campus, Berkeley, CA
会议主办单位：
Univ Calif, Clark Kerr Campus
会议论文集名称：
Journal of Physics Conference Series
摘要：
We visualized the vortical fluid in fluctuating QGP using (3+1)D viscous hydrodynamics, computed the spin distribution and correlation of hyperons and estimated the polarization splitting between Lambda and (Lambda) over bar.
作者：
Barnafoldi, Gergely Gabor*;Biro, Gabor;Gyulassy, Miklos;Haranozo, Szilveszter Miklos;Levai, Peter;...
期刊：
Nuclear and Particle Physics Proceedings,2017年289:373-376 ISSN：2405-6014
通讯作者：
Barnafoldi, Gergely Gabor
作者机构：
[Barnafoldi, Gergely Gabor; Biro, Gabor; Gyulassy, Miklos; Levai, Peter; Haranozo, Szilveszter Miklos] Hungarian Acad Sci, Wigner Res Ctr Phys, 29-33 Konkoly Thege Miklos Str, H-1121 Budapest, Hungary.;[Papp, Gabor; Biro, Gabor; Haranozo, Szilveszter Miklos] Eotvos Lorand Univ, 1-A Pazmany P Setany, H-1117 Budapest, Hungary.;[Gyulassy, Miklos] Columbia Univ, Dept Phys, Pupin Lab MS 5202, New York, NY 10027 USA.;[Wang, Xin-Nian; Gyulassy, Miklos] Lawrence Berkeley Natl Lab, Nucl Sci Div, MS 70R0319, Berkeley, CA 94720 USA.;[Zhang, Ben-Wei; Ma, Guoyang; Wang, Xin-Nian; Gyulassy, Miklos] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Hubei, Peoples R China.
通讯机构：
[Barnafoldi, Gergely Gabor] H;Hungarian Acad Sci, Wigner Res Ctr Phys, 29-33 Konkoly Thege Miklos Str, H-1121 Budapest, Hungary.
会议名称：
8th International Conference on Hard and Electromagnetic Probes of High Energy Nuclear Collisions
会议时间：
SEP 23-27, 2016
会议地点：
Cent China Normal Univ, Inst Particle Phys, Key Lab Quark & Lepton Phys, Wuhan, PEOPLES R CHINA
会议主办单位：
Cent China Normal Univ, Inst Particle Phys, Key Lab Quark & Lepton Phys
关键词：
HIJING plus;HIJING;Monte Carlo particle event generator;high-energy heavy ion collisions
摘要：
First calculated results with the new HIJING++ are presented for identified hadron production in high-energy heavy ion collisions. The recently developed HIJING++ version is based on the latest version of PYTHIA8 and contains all the nuclear effects has been included in the HIJING2.552, which will be improved by a new version of the shadowing parametrization and jet quenching module. Here, we summarize the major changes of the new program code beside the comparison between experimental data for some specific high-energy nucleus-nucleus collisions.
摘要：
We derive the pseudoscalar condensate induced by anomaly and vorticity from the Wigner function for massive fermions in homogeneous electromagnetic fields. It has an anomaly term and a force-vorticity coupling term. As a mass effect, the pseudoscalar condensate is linearly proportional to the fermion mass in small mass expansion. By a generalization to two-flavor and three-flavor cases, the neutral pion and eta meson condensates are calculated from the Wigner function and have anomaly parts as well as force-vorticity parts, in which the anomaly part of the neutral pion condensate is consistent with the previous result. We also discuss the possible observables of the condensates in heavy-ion collisions such as collective flows of neutral pions and eta mesons which may be influenced by the electromagnetic field and vorticity profiles.
通讯机构：
[Pang, Long-Gang] F;[Pang, Long-Gang] U;Frankfurt Inst Adv Studies, D-60438 Frankfurt, Germany.;Univ Calif Berkeley, Phys Dept, Berkeley, CA 94720 USA.
会议名称：
26th International Conference on Ultrarelativistic Nucleus-Nucleus Collissions (Quark Matter)
会议时间：
FEB 05-11, 2017
会议地点：
Chicago, IL
会议主办单位：
[Li, Hui;Wang, Qun;Xia, Xiao-Liang] Univ Sci & Technol China, Dept Modern Phys, Hefei 230026, Anhui, Peoples R China.^[Petersen, Hannah;Pang, Long-Gang] Frankfurt Inst Adv Studies, D-60438 Frankfurt, Germany.^[Petersen, Hannah] Goethe Univ, Inst Theoret Phys, D-60438 Frankfurt, Germany.^[Petersen, Hannah] GSI Helmholtzzentrum Schwerionenforsch, D-64291 Darmstadt, Germany.^[Pang, Long-Gang] Univ Calif Berkeley, Phys Dept, Berkeley, CA 94720 USA.^[Petersen, Hannah;Wang, Xin-Nian] Lawrence Berkeley Natl Lab, Nucl Sci Div, Berkeley, CA 94720 USA.^[Wang, Xin-Nian] Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Hubei, Peoples R China.^[Wang, Xin-Nian] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Hubei, Peoples R China.
关键词：
Vorticity;Polarization;Spin distribution and correlation
摘要：
We compute the fermion spin distribution in,the vortical fluid created in off-central high energy heavy-ion collisions. We employ the event-by-event (3+1)D viscous hydrodynamic model. The spin polarization density is proportional to the local fluid vorticity in quantum kinetic theory. As a result of strong collectivity, the spatial distribution of the local vorticity on the freeze-out hyper-surface strongly correlates to the rapidity and azimuthal angle distribution of fermion spins. We investigate the sensitivity of the local polarization to the initial fluid velocity in the hydrodynamic model and compute the global polarization of Lambda hyperons by the AMPT model. The energy dependence of the global polarization agrees with the STAR data.
作者机构：
[Chen, Wei; Wang, Xin-Nian; Luo, Tan] Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Hubei, Peoples R China.;[Chen, Wei; Wang, Xin-Nian; Luo, Tan] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Hubei, Peoples R China.;[Pang, Longgang; Wang, Xin-Nian; Cao, Shanshan] Lawrence Berkeley Natl Lab, Nucl Sci Div MS 70R0319, Berkeley, CA 94720 USA.;[Cao, Shanshan] Wayne State Univ, Dept Phys & Astron, Detroit, MI 48201 USA.;[Pang, Longgang; Wang, Xin-Nian] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA.
通讯机构：
[Chen, Wei] C;Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Hubei, Peoples R China.;Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Hubei, Peoples R China.
会议名称：
26th International Conference on Ultrarelativistic Nucleus-Nucleus Collissions (Quark Matter)
会议时间：
FEB 05-11, 2017
会议地点：
Chicago, IL
会议主办单位：
[Chen, Wei;Luo, Tan;Wang, Xin-Nian] Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Hubei, Peoples R China.^[Chen, Wei;Luo, Tan;Wang, Xin-Nian] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Hubei, Peoples R China.^[Cao, Shanshan;Pang, Longgang;Wang, Xin-Nian] Lawrence Berkeley Natl Lab, Nucl Sci Div MS 70R0319, Berkeley, CA 94720 USA.^[Cao, Shanshan] Wayne State Univ, Dept Phys & Astron, Detroit, MI 48201 USA.^[Pang, Longgang;Wang, Xin-Nian] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA.
关键词：
Linear Boltzmann Transport;hydrodynamic;gamma-hadron correlation
摘要：
Both jet transport and jet-induced medium excitation are investigated simultaneously within the coupled Linear Boltzmann Transport and hydro (CoLBT-hydro) model. In this coupled approach, energy-momentum deposition from propagating jet shower partons in the elastic and radiation processes is taken as a source term in hydrodynamics and the hydro background for LBT simulation is updated for next time step. We use CoLBT-hydro model to simulate γ-jet events of Au+Au collisions at RHIC. Hadron spectra from both the hadronization of jet shower partons and jet-induced medium excitation are calculated and compared to experimental data. Parton energy loss of jet shower partons leads to the suppression of hadron yields at large zT=pTh/pTγ while medium excitations leads to enhancement of hadron yields at small zT. Meanwhile, a significant broadening of low pT hadron yields and the depletion of soft hadrons in the γ direction are observed in the calculation of γ-hadron angular correlation.
作者机构：
[Cao, Shanshan] Wayne State Univ, Dept Phys & Astron, Detroit, MI 48201 USA.;[Wang, Xin-Nian; Cao, Shanshan; He, Yayun] Lawrence Berkeley Natl Lab, Nuclear Sci Div, Berkeley, CA 94720 USA.;[Qin, Guang-You; Wang, Xin-Nian; He, Yayun; Luo, Tan] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Hubei, Peoples R China.;[Qin, Guang-You; Wang, Xin-Nian; He, Yayun; Luo, Tan] Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Hubei, Peoples R China.
通讯机构：
[Cao, Shanshan] W;[Cao, Shanshan] L;Wayne State Univ, Dept Phys & Astron, Detroit, MI 48201 USA.;Lawrence Berkeley Natl Lab, Nuclear Sci Div, Berkeley, CA 94720 USA.
会议名称：
26th International Conference on Ultrarelativistic Nucleus-Nucleus Collissions (Quark Matter)
会议时间：
FEB 05-11, 2017
会议地点：
Chicago, IL
会议主办单位：
[Cao, Shanshan] Wayne State Univ, Dept Phys & Astron, Detroit, MI 48201 USA.^[Cao, Shanshan;He, Yayun;Wang, Xin-Nian] Lawrence Berkeley Natl Lab, Nuclear Sci Div, Berkeley, CA 94720 USA.^[Luo, Tan;He, Yayun;Qin, Guang-You;Wang, Xin-Nian] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Hubei, Peoples R China.^[Luo, Tan;He, Yayun;Qin, Guang-You;Wang, Xin-Nian] Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Hubei, Peoples R China.
关键词：
relativistic nuclear collisions;jet energy loss;heavy quark;angular correlation function
摘要：
We establish a linear Boltzmann transport (LBT) model coupled to hydrodynamical background to study hard parton evolution in heavy-ion collisions. Both elastic and inelastic scatterings are included in our calculations; and heavy and light flavor partons are treated on the same footing. Within this LBT model, we provide good descriptions of heavy and light hadron suppression and anisotropic flow in heavy-ion collisions. Angular correlation functions between heavy and light flavor hadrons are studied for the first time and shown able to quantify not only the amount of heavy quark energy loss, but also how the parton energy is re-distributed in parton showers.
期刊：
Nuclear and Particle Physics Proceedings,2017年289:217-220 ISSN：2405-6014
通讯作者：
Cao, Shanshan
作者机构：
[Wang, Xin-Nian; Cao, Shanshan; He, Yayun] Lawrence Berkeley Natl Lab, Nucl Sci Div, Berkeley, CA 94720 USA.;[Cao, Shanshan] Wayne State Univ, Dept Phys & Astron, 666 W Hancock St, Detroit, MI 48201 USA.;[Pang, Long-Gang] Frankfurt Inst Adv Studies, Ruth Moufang Str 1, D-60438 Frankfurt, Germany.;[Qin, Guang-You; Wang, Xin-Nian; He, Yayun; Luo, Tan] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Hubei, Peoples R China.;[Qin, Guang-You; Wang, Xin-Nian; He, Yayun; Luo, Tan] Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Hubei, Peoples R China.
通讯机构：
[Cao, Shanshan] L;[Cao, Shanshan] W;Lawrence Berkeley Natl Lab, Nucl Sci Div, Berkeley, CA 94720 USA.;Wayne State Univ, Dept Phys & Astron, 666 W Hancock St, Detroit, MI 48201 USA.
会议名称：
8th International Conference on Hard and Electromagnetic Probes of High Energy Nuclear Collisions
会议时间：
SEP 23-27, 2016
会议地点：
Cent China Normal Univ, Inst Particle Phys, Key Lab Quark & Lepton Phys, Wuhan, PEOPLES R CHINA
会议主办单位：
Cent China Normal Univ, Inst Particle Phys, Key Lab Quark & Lepton Phys
关键词：
relativistic nuclear collisions;jet energy loss;linear Boltzmann transport
摘要：
We establish a linear Boltzmann transport (LBT) model coupled to hydrodynamical background to study hard parton evolution in heavy-ion collisions. Both elastic and inelastic scatterings are included in our calculations; and heavy and light flavor partons are treated on the same footing. Within this LBT model, we provide good descriptions of heavy and light hadron suppression from RHIC to the LHC energies. Possible solutions to the RAA vs. v2 puzzle are discussed.
作者机构：
[Zhang, Han-Zhong; Wang, Xin-Nian; Wei, Shu-Yi] Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Hubei, Peoples R China.;[Zhang, Han-Zhong; Wang, Xin-Nian; Wei, Shu-Yi] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Hubei, Peoples R China.;[Wang, Xin-Nian] Lawrence Berkeley Natl Lab, Div Nucl Sci, Mailstop 70R0319, Berkeley, CA 94740 USA.
通讯机构：
[Wei, Shu-Yi] C;Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Hubei, Peoples R China.;Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Hubei, Peoples R China.
摘要：
Jet energy loss and single inclusive jet suppression in high-energy heavy-ion collisions are studied within a pQCD parton model that includes both elastic and radiative interactions between jet shower and medium partons as they propagate through the quark-gluon plasma. The collisional energy loss of jets with a given cone size is found to be relatively small comparing with the radiative energy loss. However, the effect of transverse momentum broadening due to elastic scattering is significant in the calculation of radiative energy loss within the high-twist formalism. The nuclear modification factors for single inclusive jets with different cone sizes are calculated and compared to experimental data as measured by ALICE and ATLAS experiments in Pb+Pb collisions at sNN=2.76 TeV. Results on jet suppression in Pb+Pb collisions at sNN=5.02 TeV are also presented.
摘要：
Fermions become polarized in a vortical fluid due to spin-vorticity coupling, and the polarization density is proportional to the local fluid vorticity. The radial expansion converts spatial vortical structures in the transverse plane to spin correlations in the azimuthal angle of final Λ hyperons’ transverse momentum in high-energy heavy-ion collisions. Using a (3+1)D viscous hydrodynamic model with fluctuating initial conditions from a multiphase transport (AMPT) model, we reveal two vortical structures that are common in many fluid dynamic systems: a right-handed toroidal structure around each beam direction for transverse vorticity and pairing of longitudinal vortices with opposite signs in the transverse plane. The calculated azimuthal correlation of the transverse spin is shown to have a cosine form plus an offset due to the toroidal structure of the transverse vorticity around the beam direction and the global spin polarization. The longitudinal spin correlation in the azimuthal angle shows an oscillatory structure due to multiple vorticity pairs in the transverse plane. Mechanisms of these vortical structures, physical implications of hyperon spin correlations, dependence on colliding energy, rapidity, centrality, and sensitivity to the shear viscosity are also investigated.
作者机构：
[Xing, Hongxi; Kang, Zhong-Bo] Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA.;[Qiu, Jian-Wei] Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA.;[Qiu, Jian-Wei] SUNY Stony Brook, CN Yang Inst Theoret Phys, Stony Brook, NY 11794 USA.;[Qiu, Jian-Wei] SUNY Stony Brook, Dept Phys & Astron, Stony Brook, NY 11794 USA.;[Wang, Xin-Nian] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.
通讯机构：
[Kang, Zhong-Bo] L;Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA.
摘要：
We present the nuclear transverse momentum broadening for Drell-Yan lepton pair production in p+A collisions at next-to-leading order in powers of strong coupling constant αs. We verify that the transverse-momentum-weighted differential cross section in next-to-leading order perturbative QCD at twist 4 can be factorized into the convolution of the parton distribution function of an active parton in the projectile proton, a twist-4 multiparton correlation function of the target nucleus, and a perturbatively calculable hard coefficient function. We identify a QCD evolution equation for such a twist-4 nuclear gluon-quark correlation function and verify its universality—its process independence. This finding demonstrates the prediction power of the perturbative QCD factorization approach for studying parton multiple scattering in the nuclear medium.
作者机构：
[Wang, Enke; Wang, Xin-Nian; He, Yayun; Luo, Tan] Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Peoples R China.;[Wang, Enke; Wang, Xin-Nian; He, Yayun; Luo, Tan] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.;[Wang, Xin-Nian] Lawrence Berkeley Natl Lab, Div Nucl Sci, Mailstop 70R0319, Berkeley, CA 94740 USA.
通讯机构：
[Luo, Tan] 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.
会议名称：
25th International Conference on Ultra-Relativistic Nucleus-Nucleus Collisions
摘要：
We use the Linear Boltzmann Transport model to study gamma-triggered jets in high-energy heavy-ion collisions. Since both recoiled partons from elastic scattering and radiated gluons from inelastic processes and their further propagation are considered, the model can provide a description of not only the medium modification of reconstructed jets but also the energy flow in the underlying hydrodynamic background. In this study, we discuss the modification of jet shape and jet fragmentation function of γ-jet in central Pb+Pb collisions and in particular the energy flow induced by the jet-medium interaction.
