作者机构：
[Yang, C. B.] 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.
通讯机构：
[Yang, C. B.] C;Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Peoples R China.
摘要：
In this paper, yields of strange hadrons in relativistic heavy-ion collisions are investigated in the framework of the recombination model. Yield ratios of strange to nonstrange hadrons are studied. Strangeness enhancement is shown stronger for higher initial quark densities and for hadrons with more strange quarks.
作者机构：
[Yang, C. B.; Wang, X.] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.
通讯机构：
[Yang, C. B.] C;Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.
关键词：
Detrended fluctuation analysis (DFA);multifractal DFA;phase space;UrQMD model
摘要：
Nonstatistical dynamical fluctuations by means of the detrended fluctuation analysis (DFA) and multifractal DFA are studied. We used a two-dimensional algorithm for the analyses. By choosing different particles generated by UrQMD code, we show that different particles all have good scaling behaviors with bin size. The correlation between different identified particles are also discussed.
作者机构：
[Yang, C. B.] 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.
通讯机构：
[Yang, C. B.] C;Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Peoples R China.
摘要：
The effect of multiplicity correlation between two bins to the dynamical fluctuations is investigated for a second-order phase transition from quark–gluon plasma (QGP) to hadrons, within the Ginzburg–Landau description for the transition. Normalized factorial correlators are used to characterize the dynamical fluctuations. A scaling behavior among the correlators is found, and an approximate universal exponent is obtained with very weak dependence on the details of the phase transition.
期刊：
JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS,2013年40(7):075103 ISSN：0954-3899
通讯作者：
Wang, X.
作者机构：
[Yang, C. B.; Wang, X.] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.;[Yang, C. B.; Wang, X.] Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, Wuhan 430077, Peoples R China.
通讯机构：
[Wang, X.] C;Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.
摘要：
The colliding energy and centrality dependence of the net-proton distributions in Cu+Cu collisions are studied in a simple model based on baryon stopping and pair production effects in the processes. Predictions are presented for Cu+Cu collisions for the net-proton distributions at different centralities and different energies.
摘要：
The principle governing the evolution of transportation network is discussed.It is argued that new edges should be added in the network to increase the network efficiency as much as possible.The evolution of some properties of the network is considered, including the degree distributions, number of paths with different distances, the moments of the spectrum distributions.
期刊：
Journal of Physics: Conference Series,2012年394(1) ISSN：1742-6588
通讯作者：
Qian, W. Y.
作者机构：
[Qian, W. Y.] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.;Minist Educ, Key Lab Quark & Lepton Phys CCNU, Beijing, Peoples R China.
通讯机构：
[Qian, W. Y.] C;Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.
会议名称：
3rd International Workshop on Statistical Physics and Mathematics for Complex Systems (SPMCS)
会议时间：
AUG 25-30, 2012
会议地点：
Kazan Fed Univ, Volga Reg, Kazan, RUSSIA
会议主办单位：
Kazan Fed Univ, Volga Reg
会议论文集名称：
Journal of Physics Conference Series
摘要：
The critical fluctuation properties of fitness distribution in the one-dimensional Bak-Sneppen model are studied in terms of the normalized factorial moments, erraticity moments and the factorial correlators. For a fitness window below the gap intermittent behaviors are observed. The scaling exponent for the BS model is different from that in two dimensional Ising model for second order phase transition. There is no correlation between fluctuations in two windows separated by the critical gap.
作者机构：
[Yang, C. B.; Hwa, Rudolph C.] Univ Oregon, Inst Theoret Sci, Eugene, OR 97403 USA;[Yang, C. B.; Hwa, Rudolph C.] Univ Oregon, Dept Phys, Eugene, OR 97403 USA;[Yang, C. B.] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China
通讯机构：
[Hwa, Rudolph C.] U;Univ Oregon, Inst Theoret Sci, Eugene, OR 97403 USA.
摘要：
In central Pb-Pb collisions at the Large Hadron Collider the multiplicity of particles produced is so high that it should become feasible to examine the nature of transition from the deconfined quark-gluon state to the confined hadron state by methods that rely on the availability of high-multiplicity events. We consider four classes of the transition process ranging from critical behavior to totally random behavior, depending on whether there is clustering of quarks and whether there is contraction of dense clusters owing to confinement. Fluctuations of bin multiplicities in each event are quantified, and then the event-by-event fluctuations of spatial patterns are analyzed. A sequence of measures is proposed and is shown to be effective in capturing the essence of the differences among the classes of simulated events. It is demonstrated that a specific index has a low value for critical transition but a larger value if the hadronization process is random.
期刊：
EUROPEAN PHYSICAL JOURNAL B,2012年85(5):154-null ISSN：1434-6028
通讯作者：
Xiao, S. S.
作者机构：
[Xiao, S. S.] Cent China Normal Univ, Dept Comp Sci, Wuhan 430079, Peoples R China.;[Yang, C. B.] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.;[Yang, C. B.] Minist Educ, Key Lab Quark & Lepton Phys CCNU, Wuhan 430079, Peoples R China.
通讯机构：
[Xiao, S. S.] C;Cent China Normal Univ, Dept Comp Sci, Wuhan 430079, Peoples R China.
作者机构：
[Wang, X.] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.;Minist Educ, Key Lab Quark & Lepton Phys CCNU, Wuhan 430079, Peoples R China.
通讯机构：
[Wang, X.] C;Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.
摘要：
The higher order moments of the net-baryon distributions in relativistic heavy ion collisions are useful probes for the QCD critical point and fluctuations. Within a simple model we study the colliding energy and centrality dependence of the net-proton distributions in the central rapidity region. The model is based on considering the baryon stopping and pair production effects in the processes. Based on some physical reasoning, the dependence is parameterized. Predictions for the net-proton distributions for Au+Au and Pb+Pb collisions at different centralities at sNN=39 and 2760 GeV, respectively, are presented from the parametrizations for the model parameters. A possible test of our model is proposed from investigating the net-proton distributions in the noncentral rapidity region for different colliding centralities and energies.
摘要：
The origin of power-law distributions in self-organized criticality is investigated by treating the variation of the number of active sites in the system as a stochastic process. An avalanche is mapped to a first-return random-walk process in a one-dimensional lattice. In order to understand the reason of variant exponents for the power-law distributions in different self-organized critical systems, we introduce the correlations among evolution steps. Power-law distributions of the lifetime and spatial size are found when the random walk is unbiased with equal probability to move in opposite directions. It is found that the longer the correlation length, the smaller values of the exponents for the power-law distributions.
摘要：
In the frame of the quark recombination model, we study the momentum distributions and correlations of constituent quarks in jets by analyzing the final state hadrons generated by PYTHIA for the hard parton fragmentation processes in vacuum. Parameterizations for the distributions are tabulated.
期刊：
International Journal of Modern Physics E,2011年20(5):1213-1226 ISSN：0218-3013
通讯作者：
Peng, R.
作者机构：
[Yang, C. B.; Peng, R.] Hua Zhong Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.;[Yang, C. B.; Peng, R.] Minist Educ, Key Lab Quark & Lepton, Wuhan 430079, Peoples R China.;[Peng, R.] Wuhan Univ Sci & Technol, Coll Sci, Wuhan 430065, Peoples R China.
通讯机构：
[Peng, R.] H;Hua Zhong Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.
关键词：
Recombination model;fragmentation function;shower parton distribution;heavy flavored meson production
摘要：
We find the distributions of shower partons initiated by heavy quarks c and b by studying the fragmentation functions in the framework of the recombination model. The transverse momentum spectra of heavy flavored mesons are predicted with these distributions. We find that the contribution from the recombination of thermal-shower partons is an important part in the total spectrum for the mesons. We predict the heavy flavored meson productions for different centralities with the heavy quark fugacities fitted by the experimental data of J/ψ transverse momentum spectra in Au+Au collisions.
作者机构：
[Yang, C. B.; Hwa, Rudolph C.] Univ Oregon, Inst Theoret Sci, Eugene, OR 97403 USA.;[Yang, C. B.; Hwa, Rudolph C.] Univ Oregon, Dept Phys, Eugene, OR 97403 USA.;[Yang, C. B.] Hua Zhong Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.
通讯机构：
[Hwa, Rudolph C.] U;Univ Oregon, Inst Theoret Sci, Eugene, OR 97403 USA.
摘要：
An interpretation of the ridge phenomenon found in pp collisions at 7 TeV is given in terms of enhancement of soft partons due to energy loss of semihard jets. A description of ridge formation in nuclear collisions can directly be extended to pp collisions since hydrodynamics is not used and azimuthal anisotropy is generated by semihard scattering. The observed ridge structure is then understood as a manifestation of soft-soft transverse correlation induced by semihard partons without long-range longitudinal correlation. Both the pT and multiplicity dependencies are well reproduced. Some predictions are made about other observables.
摘要：
We study the correlation between the trigger π and the associated J/ψ on near and away sides in Au+Au collisions at √sNN = 200 GeV. In the region of trigger momentum pt > 4 GeV/c, the π spectrum is composed of thermal-shower and shower-shower recombinations in the frame work of the recombination model. We consider the azimuthal anisotropy in the quenched hard parton distribution and then calculate the elliptic flow parameter v2 of charmed mesons (J/&160, D~0 and Ds) for different centralities
作者机构：
[Yang, C. B.] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.;Minist Educ, Key Lab Quark & Lepton Phys CCNU, Beijing, Peoples R China.
通讯机构：
[Yang, C. B.] C;Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.
摘要：
The higher order moments of the net-baryon distributions in relativistic heavy ion collisions are useful probes for the QCD critical point and fluctuations. We study the net-proton distributions and their moments in a simple model which considers the baryon stopping and pair production effects in the processes. It is shown that a single emission source model can explain the experimental data well. The centrality dependence and the energy dependence of the distributions and higher moments are discussed.
作者机构：
[Yang, C. B.; Peng, R.] Hua Zhong Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.;[Peng, R.] Wuhan Univ Sci & Technol, Coll Sci, Wuhan 430065, Peoples R China.
通讯机构：
[Peng, R.] H;Hua Zhong Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.
关键词：
Recombination model;Fragmentation function;Shower parton distribution;Charmed meson production
摘要：
We first determine c and (c) over bar shower parton distributions in jets induced by light and charm hard partons in the framework of the recombination model from relevant fragmentation functions. The shower parton distributions can be used to calculate other fragmentation functions and study charmed hadron production in other collisions. When the distributions are applied to reproduce the J/psi production in Au + Au collisions at root(NN)-N-s = 200 GeV, energy loss effect is taken into account for J/psi production due to its momentum loss in traversing the dense medium. We find that the contribution of thermal shower parton recombination dominates over other mechanisms of hadronization in the region of 3.3 < PT < 5.8 GeV/c. The calculated J/psi transverse momentum spectrum is in good agreement with the experimental data. (C) 2010 Elsevier B.V. All rights reserved.
作者机构：
[Yang, C. B.; Hwa, Rudolph C.] Univ Oregon, Inst Theoret Sci, Eugene, OR 97403 USA.;[Yang, C. B.; Hwa, Rudolph C.] Univ Oregon, Dept Phys, Eugene, OR 97403 USA.;[Yang, C. B.] Hua Zhong Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.
通讯机构：
[Hwa, Rudolph C.] U;Univ Oregon, Inst Theoret Sci, Eugene, OR 97403 USA.
摘要：
For heavy-ion collisions at the BNL Relativistic Heavy Ion Collider (RHIC) a scaling behavior is found in the dependencies on azimuthal angle ϕ and impact parameter b for pion production at high pT essentially independent of the hadronization process. The scaling variable is in terms of a dynamical path length ξ that takes into account detailed properties of geometry, medium density, and probability of hard scattering. It is shown in the recombination model how the nuclear modification factor depends on the average ξ̄(ϕ,b). The data for π0 production at pT=4–5 and 7–8 GeV/ c at RHIC are shown to exhibit the same scaling behavior as found in the model calculation. Extension to back-to-back dijet production has been carried out, showing the existence of ξ̄ scaling also in the away-side yield per trigger. At the CERN Large Hadron Collider the hard-parton density can be high enough to realize the likelihood of recombination of shower partons arising from neighboring jets. It is shown that such two-jet recombination can cause strong violation of ξ̄ scaling. Furthermore, the large value of RAA that exceeds 1 can become a striking signature of such a hadronization process at high energy.
