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Zhu X. | Zhu J. | Zhu K. | Zhu K. J. | Zhu X. L. | Zhu Z. A. | Zhu Y. C. | Zhu Y. S. | Zhu Shi-Lin | Zhu S.

L | L Navaneet K | L Smitha M. | L Srikanth P | L Aashiha Priyadarshni. | L Alex F Estupiñán | L Alex F. Estupiñán | L Altamirano-Dévora | L Arun S | L Berdinskiy V.

L | L Navaneet K | L Smitha M. | L Srikanth P | L Aashiha Priyadarshni. | L Alex F Estupiñán | L Alex F. Estupiñán | L Altamirano-Dévora | L Arun S | L Berdinskiy V.

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Description of Charged Particle Pseudorapidity Distributions in Pb+Pb Collisions with Tsallis Thermodynamics

Gao Y., Zheng H., Zhu L. L., Bonasera A.
09 Jun 2017 nucl-th hep-ph arxiv.org/abs/1706.03693

The centrality dependence of pseudorapidity distributions for charged particles produced in Au+Au collisions at $\sqrt{s_{NN}}=130$ GeV and 200 GeV at RHIC, and in Pb+Pb collisions at $\sqrt{s_{NN}}=2.76$ TeV at LHC are investigated in the fireball model, assuming that the rapidity axis is populated with fireballs following one distribution function. We assume that the particles in the fireball fulfill the Tsallis distribution. The theoretical results are compared with the experimental measurements and a good agreement is found. Using these results, the pseudorapidity distributions of charged particles produced in Pb+Pb central collisions at $\sqrt{s_{NN}}=5.02$ TeV and 10 TeV are predicted.

Search For the Origin of the Away-side Double-humped Structure of jets in Heavy Ion Collisions

Zheng H., Zhu L. L., Yang C. B.
09 Jul 2009 nucl-th arxiv.org/abs/0907.1700

A model is constructed for the origin of the double-humped structure found in the di-hahron azimuthal correlation on the away-side in heavy ion collisions. The parameters in the model are determined by fitting $\Delta\phi$ azimuthal distribution in central Au+Au collisions at RHIC given by STAR collaboration when the trigger momentum is in $3-4\rm {GeV/c}$ and the associated particle momentum is in $1.3-1.8\rm{GeV/c}$. Then we apply our model to the semi-central and peripheral Au+Au collisions at RHIC and the responding $\triangle \phi$ azimuthal distribution are reproduced respectively. Our results show that the transverse flow effect plays an essential role in the experimentally observed di-hadron azimuthal distribution structure. The spread of the hard parton creation point and initial moving direction is also necessary for the double-humped structure.

Scaling Behavior of Transverse Kinetic Energy Distributions in Au+Au Collisions at $\sqrt{s_{\rm NN}}=200$ GeV

Zhu L. L., Zheng H., Yang C. B.
14 Jan 2008 nucl-th arxiv.org/abs/0801.2195

With the experimental data from STAR on the centrality dependence of transverse momentum $p_T$ spectra of pions and protons in Au+Au collisions at $\sqrt{s_{NN}}=200 {\rm GeV}$, we investigate the scaling properties of transverse energy $E_T$ distributions at different centralities. In the framework of cluster formation and decay mechanism for particle production, the universal transverse energy distributions for pion and proton can be described separately but not simultaneously.

Strange hadron yields and ratios in heavy ion collisions at RHIC energy

Hamar G., Zhu L. L., Csizmadia P., Levai P.
25 Oct 2007 nucl-th arxiv.org/abs/0710.4730

Recent experimental data support the presence of quark coalescence in heavy ion collisions at RHIC energies. Hadronization of quark matter and hadron formation in heavy ion collisions can be described by the coalescence process, and measured data are reproduced successfully. On the other hand, the theoretical coalescence calculations are based on a non-relativistic description. Here we investigate the robustness of the coalescence description, using different wave-function overlap during hadron formation.

Scaling p_T distributions for p and \bar{p} produced in Au+Au collisions at RHIC

Zhang W. C., Zeng Y., Nie W. X., Zhu L. L., Yang C. B.
09 Apr 2007 nucl-th arxiv.org/abs/0704.1062

With the experimental data from STAR and PHENIX on the centrality dependence of the $p_T$ spectra of protons and anti-protons produced at mid-rapidity in Au+Au collisions at 200 GeV, we show that for protons and anti-protons there exists a scaling distribution independent of the colliding centrality. The scaling functions can also describe data from BRAHMS for both proton and anti-proton spectra at $y=2.2$ and 3.2. The scaling behaviors are shown to be incompatible with the usual string fragmentation scenario for particle production.

Universal Scaling of $p_T$ Distribution of Particles in Relativistic Nuclear Collisions

Zhu L. L., Yang C. B.
05 Aug 2006 nucl-th arxiv.org/abs/nucl-th/0608016

With the experimental data from STAR, PHENIX and BRAHMS on the centrality and rapidity dependence of the $p_T$ spectrum in Au+Au and d+Au collisions, we show that there exists a scaling distribution which is independent of the colliding system, centrality and rapidity. The parameter for the average transverse momentum $$ increases from peripheral to central d+Au collisions. This increase accounts for the enhancement of particle production in those collisions. A non-extensive entropy is used to derive the scaling function.

Particle distribution and nuclear stopping in Au-Au collisions at $\sqrt{s_{NN}}$=200 GeV

Zhu L. L., Yang C. B.
18 May 2006 nucl-th arxiv.org/abs/nucl-th/0605038

The transverse momentum distribution of produced charged particles is investigated for gold-gold collisions at $\sqrt{s_{NN}}=200$ GeV. A simple parameterization is suggested for the particle distribution based on the nuclear stopping effect. The model can fit very well both the transverse momentum distributions at different pseudo-rapidities and the pseudo-rapidity distributions at different centralities. The ratio of rapidity distributions for peripheral and central collisions is calculated and compared with the data.

A New visita to the SU(N) gauge field confinement

Zhu Z. K., Feng D. H.
31 Aug 1993 hep-lat arxiv.org/abs/hep-lat/9308022

Based on our exact effective spin model, the zero temperature $SU(N)$ gauge field confinement has been studied by the deconfinement-confinement phase transition order parameter, i.e. the Wilson line, rather than the quark antiquark potential. The procedure would allow one to study the confinement in the true continuum limit. For the $(1+1)$ $SU(2)$ gauge field, the confinement and a linear zero temperature Polyakov quark antiquark potential were shown. It is also shown, for the first time, that the Polyakov and Wilson potentials are identical.

Determining the order of SU(3) deconfining phase transition

Zhu Z. K., Feng D. H
31 Aug 1993 hep-lat arxiv.org/abs/hep-lat/9308023

An effective spin model for the finite temperature non-abelian lattice gauge theory is derived. The outcome is the surprising result that only nearest neighbor coupling survives, thus confirming the well known numerical results that the deconfining phase transition of the (3+1)-dimensional $SU(3)$ pure gauge theory is first order.

Evidence for Color Fluctuations in Hadrons from Coherent Nuclear Diffraction}

Frankfurt L., l , Miller G. A., Strikman M.
17 Sep 1993 hep-ph nucl-th arxiv.org/abs/hep-ph/9309285

A QCD-based treatment of projectile size fluctuations is used to compute inelastic diffractive cross sections $\sigma_{diff}$ for coherent hadron-nuclear processes. We find that fluctuations near the average size give the major contribution to the cross section with $ \le few \%$ contribution from small size configurations. The computed values of $\sigma_{diff}$ are consistent with the limited available data. The importance of coherent diffraction studies for a wide range of projectiles for high energy Fermilab fixed target experiments is emphasized. The implications of these significant color fluctuations for relativistic heavy ion collisions are discussed.