131941483
Selfaffine analysis for the dynamical fluctuations inside jets produced in high-energy hadron hadron collisions
120498489
Elliptic flow in a hadron transport model
We present elliptic flow v2 as a function of freeze-out time, transverse momentum for π, K, nucleon, Λ, Ξ and Ω in Au+Au collisions at within two transport approaches (RQMD and UrQMD). The presence of mass ordering and NCQ scaling in the string-hadron model suggests that hadronic interactions do contribute to the observed particle-type dependence of v2 as well.
118862319
Initial orientation effect and selecting desired events in 520AMeV/u U-U collisions
How to select out those collisions with the desired geometry such as tip-tip and/or body-body in experiment is one key point for performing high energy UU collisions. With a relativistic transport model, we performed a simulation for deformed UU collision with vast different orientations at CSR energy area corresponding to the high net-baryon density region in QCD phase diagram. By investigating the centrality and initial collision orientation dependence of the center baryon density, we found that the tip-tip like UU collisions with extended high density phase, which is very important for studying the nuclear EoS of high baryon density matter and the possible end-point of the phase boundary, are those events with small initial orientations ($\leq20^{0}$) for bath projectile and target in reaction plane and small impact parameter ($\leq2.6fm$). We pointed out quantificationally two observations -- multiplicity of forward neutron and nuclear stopping power that both allows us to select out those most interesting events (i.e. tip-tip like), which will be very helpful for the future experiments at performing UU collisions.
18220605
Thermal Equilibration and Ellipsoidal Expansion of Rotationally-Symmetrical Longitudinal Flow in Relativistc Heavy Ion Collisions
A rotationally-symmetrical ellipsoidal flow model is proposed for the relativistic heavy-ion collisions and compared with the 14.6 A GeV/c Si-Al and 10.8 A GeV/c Au-Au collision data. The large stopping in the heavier collision system and heavier produced particles is accounted for by using the ellipsoidal flow picture. The central dip in the proton and deuteron rapidity distributions for Si-Al collision are reproduced.
117036857
On Refinement of Quark-Gluon Plasma Signal in Ultra-Relativistic Heavy Ion Collisions
The relation between the formation of a unique system and the upward-bending parameter a of 2-D(η, )lnFq vs lnM in relativistic heavy-ion collisions is discussed. It is argued that the correlation between the value of upward-bending parameter a for individual events and the value for the same events of some other quantity, e.g., K/π ratio, commonly used as quark-gluon plasma signal can be utilized to increase the reliability of this signal.
118652542
Study of triangular flow v3 in Au+Au and Cu+Cu collisions with a multiphase transport model
We studied the relation between the initial geometry anisotropy and the anisotropic flow in a multiphase transport model for both Au+Au and Cu+Cu collisions at = 200 GeV. It is found that unlike the elliptic flow v2, little centrality dependence of the triangular flow v3 is observed. After removing the initial geometry effect, v3/e3 increases with the transverse particle density, which is similar to v2/e2. The transverse momentum (pT) dependence of v3 from identified particles is qualitatively similar to the pT dependence of v2.
117754834
Emission of Relativistic Light Fragments in Nucleus-Emulsion Collisions at High Energy
The transverse momentum, emission angle and pseudorapidity distributions of relativistic ® fragments produced in nucleus-emulsion collisions have been analysed using a two-temperature emission picture. The two emission sources are the projectile spectator contact layer (hot spectator) with high temperature and the other part (cold spectator) with low temperature. The transverse momentum distributions of relativistic proton fragments produced in nucleus-emulsion collisions at high energy have been analysed by a three-temperature emission picture. The three emission sources are the projectile participant local region that emits the leading protons, the projectile spectator contact layer (hot spectator) and the other part (cold spectator), respectively. The calculated results are in agreement with the experimental data of nucleus-emulsion collisions in the present accelerator energy region. The temperatures of the emission sources can be obtained from one of the transverse momentum, emission angle and pseudorapidity distributions. For a heavy projectile at high energy (for example 208Pb at 160A GeV), the temperatures of the hot spectator and the cold spectator obtained from the pseudorapidity distribution of relativistic ® fragments are 120 and 40 MeV, respectively.
118165438
Produced Particle Rapidity (Pseudorapidity) Distribution in Au--Au and Pb--Pb Collisions at High Energy
126194289
Pseudorapidity fluctuations of extremely high multiplicity events in high-energy nucleus-nucleus collisions
59499966
On Descriptions of Particle Transverse Momentum Spectra in High Energy Collisions
The transverse momentum spectra obtained in the frame of an isotropic emission source are compared in terms of Tsallis, Boltzmann, Fermi-Dirac, and Bose-Einstein distributions and the Tsallis forms of the latter three standard distributions. It 
is obtained that, at a given set of parameters, the standard distributions show a narrower shape than their Tsallis forms which result in wide and/or multicomponent spectra with the Tsallis distribution in between. A comparison among the temperatures obtained from the distributions is made with a possible relation to the Boltzmann temperature. An example of the angular distributions of projectile fragments in nuclear collisions is given.
120288217
Comparing two-Boltzmann distribution and Tsallis statistics of particle transverse momentums in collisions at LHC energies
The transverse momentum distributions of final-state particles produced in collisions at energies available at the Large Hadron Collider (LHC) are studied by using the two-Boltzmann distribution and Tsallis statistics. Experimental distributions described by the two-Boltzmann distribution can be described by the Tsallis statistics. The two-temperature emission described by the two-Boltzmann distribution reflects temperature fluctuation of interacting system. The Tsallis statistics can describe the temperature fluctuation and the degree of non-equilibrium. The results calculated by the two-Boltzmann distribution and the Tsallis statistics are in agreement with the experimental data available at the LHC energies. In some cases, the two-Boltzmann distribution degenerates to (single) Boltzmann distribution.