Zhongxin, China
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Hwa R.C.,University of Oregon | Zhu L.,Hua Zhong Normal University
Physical Review C - Nuclear Physics | Year: 2010

The azimuthal angular dependence of the nuclear modification factor RAA(pT,Φ,Npart) recently obtained by PHENIX is related at low pT to the trigger Φ dependence of the ridge yield as measured by STAR in a framework in which the azimuthal anisotropy is driven by semihard scattering near the surface. Careful consideration of the initial geometry leads to the determination of a surface segment in which the production of semihard partons are responsible for the Φ dependence of the inclusive distribution on the one hand and for the angular correlation in ridge phenomenology on the other. With v2 also being well reproduced along with RAA and ridge yield, all relevant Φ dependencies in heavy-ion collisions can now be understood in a unified description that emphasizes the ridge production whether or not a trigger is used. © 2010 The American Physical Society.

Hwa R.C.,University of Oregon | Yang C.B.,University of Oregon | Yang C.B.,Hua Zhong Normal University
Physical Review C - Nuclear Physics | Year: 2010

For heavy-ion collisions at the BNL Relativistic Heavy Ion Collider (RHIC) a scaling behavior is found in the dependencies on azimuthal angle 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 ξ(,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 ξ 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 ξ scaling. Furthermore, the large value of RAA that exceeds 1 can become a striking signature of such a hadronization process at high energy. © 2010 The American Physical Society.

Hwa R.C.,University of Oregon | Yang C.B.,University of Oregon | Yang C.B.,Hua Zhong Normal University
Physical Review C - Nuclear Physics | Year: 2011

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 p T and multiplicity dependencies are well reproduced. Some predictions are made about other observables. © 2011 American Physical Society.

Jin M.,Hua Zhong Normal University | Urban M.,University Paris - Sud | Schuck P.,University Paris - Sud | Schuck P.,CNRS Physics and Models in Condensed Media Laboratory
Physical Review C - Nuclear Physics | Year: 2010

The effect of nucleon-nucleon correlations in symmetric nuclear matter at finite temperature is studied beyond BCS theory. Starting from a Hartree-Fock description of nuclear matter with the Gogny effective interaction, we add correlations corresponding to the formation of preformed pairs and scattering states above the superfluid critical temperature within the in-medium T-matrix approach, which is analogous to the Nozières-Schmitt-Rink theory. We calculate the critical temperature for a BEC superfluid of deuterons, of a BCS superfluid of nucleons, and in the crossover between these limits. The effect of the correlations on thermodynamic properties (equation of state, energy, entropy) and the liquid-gas phase transition is discussed. Our results show that nucleon-nucleon correlations beyond BCS play an important role for the properties of nuclear matter, especially in the low-density region. © 2010 The American Physical Society.

Shu S.,Hubei University | Li J.,Hua Zhong Normal University
Physical Review C - Nuclear Physics | Year: 2010

The Friedberg-Lee (FL) model is studied at finite temperature and density. The soliton solutions of the FL model in the deconfinement phase transition are solved and thoroughly discussed for certain boundary conditions. We indicate that the solitons before and after the deconfinement have different physical meanings: the soliton before deconfinement represents hadrons, while the soliton after the deconfinement represents the bound state of quarks which leads to a strongly interacting quark-gluon plasma phase. The corresponding phase diagram is given. © 2010 The American Physical Society.

Vitev I.,Los Alamos National Laboratory | Zhang B.-W.,Hua Zhong Normal University
Physical Review Letters | Year: 2010

We demonstrate that jet observables are highly sensitive to the characteristics of the vacuum and the in-medium QCD parton showers and propose techniques that exploit this sensitivity to constrain the mechanism of quark and gluon energy loss in strongly interacting plasmas. As a first example, we calculate the inclusive jet cross section in high-energy nucleus-nucleus collisions to O(αs3). Theoretical predictions for the medium-induced jet broadening and the suppression of the jet production rate due to cold and hot nuclear matter effects in Au+Au and Cu+Cu reactions at RHIC are presented. © 2010 The American Physical Society.

Chen M.-H.,Hua Zhong Normal University | Zhang G.-P.,Wuhan University of Science and Technology
2010 3rd International Symposium on Knowledge Acquisition and Modeling, KAM 2010 | Year: 2010

Tacit knowledge forms foundation and source of core-competitiveness and can play more significant role on technology innovation of firms. Firms need to develop tacit knowledge to gain competitive advantage. However, merely possession of knowledge does not guarantee an edge in competition. Quantity of tacit knowledge holders is smaller in intra-organization. To increase the quantity of tacit knowledge holders, tacit knowledge must be transferred in intra-organization. In this paper, we put forward categorizations of tacit knowledge and various transference model of tacit knowledge, and analyze relation of between disseminative capacity of knowledge senders and absorptive capacity of knowledge recipients in intra-organization. Theoretical analysis and simulation results convince us that pull-model applied to tacit knowledge flows to transfer, star-model and tree-model applied to socialization and externalization of tacit knowledge. © 2010 IEEE.

Li H.,Hua Zhong Normal University | Liu F.,Hua Zhong Normal University | Ma G.-L.,CAS Shanghai Institute of Applied Physics | Wang X.-N.,Hua Zhong Normal University | And 2 more authors.
Physical Review Letters | Year: 2011

Medium excitation by jet shower propagation inside a quark-gluon plasma is studied within a linear Boltzmann transport and a multiphase transport model. Contrary to the naive expectation, it is the deflection of both the jet shower and the Mach-cone-like excitation in an expanding medium that is found to give rise to a double-peak azimuthal particle distribution with respect to the initial jet direction. Such a deflection is the strongest for hadron-triggered jets which are often produced close to the surface of a dense medium due to trigger bias and travel against or tangential to the radial flow. Without such trigger bias, the effect of deflection on γ-jet showers and their medium excitation is weaker. Comparative study of hadron and γ-triggered particle correlations can therefore reveal the dynamics of jet-induced medium excitation in high-energy heavy-ion collisions. © 2011 The American Physical Society.

Feng Y.,South-Central University for Nationalities | Li W.,Hua Zhong Normal University
Journal of Physics: Conference Series | Year: 2015

We studied a network of pulse-coupled Hindmarsh-Rose neurons and discovered that all that matters for the onset of complete synchrony is the number of signals, k, received by each neuron. This is independent of all other details of the network structure. © Published under licence by IOP Publishing Ltd.

Peng R.,Hua Zhong Normal University | Peng R.,Wuhan University of Science and Technology | Yang C.B.,Hua Zhong Normal University
Nuclear Physics A | Year: 2010

We first determine c and c̄ 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/ψ production in Au+Au collisions at √sNN=200 GeV, energy loss effect is taken into account for J/ψ 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

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