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- the PHENIX Collaboration 7 (%)
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- Csernai, L. P. 6 (%)
- Greiner, W. 6 (%)
- Biró, Tamás S. 5 (%)

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## On the coherent inelastic processes in collisions of elementary particles with nuclei at ultrarelativistic energies

### Acta Physica Hungarica Series A, Heavy Ion Physics (2006-02-01) 27: 347-350 , February 01, 2006

The coherent inelastic processes of the type *a* → *b*, which may take place in the interaction of hadrons and γ quanta with nuclei at very high energies (the nucleus remains the same), are theoretically investigated. Analytical formulas for the effective cross-section σ_{coh}(*a*→*b*) are obtained.

## Results from PHENIX: Year-1 and outlook

### Acta Physica Hungarica Series A, Heavy Ion Physics (2003-02-01) 17: 191-196 , February 01, 2003

The Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory had its first physics run Summer 2000 colliding Au+Au ions at √^{s}*NN*=130 GeV energy. The PHENIX experiment measured global observables of the collision, spectra of electrons and identified hadrons as well as pair correlations. This talk gives an overview of the PHENIX results as presented at the *Budapest'02 Workshop on Quark and Hadron Dynamics*, Budapest, Hungary, March 3–7, 2002.

## Partonic effects in heavy ion collisions at RHIC

### Acta Physica Hungarica Series A, Heavy Ion Physics (2003-02-01) 17: 219-228 , February 01, 2003

Effects of partonic interactions in heavy ion collisions at RHIC are studied in a multiphase transport model (AMPT) that includes both initial partonic and final hadronic interactions. It is found that a large parton scattering cross section is needed to understand the measured elliptic flow of pions and two-pion correlation function.

## Quark-gluon plasma signatures in nucleus-nucleus collisions at CERN SPS

### Acta Physica Hungarica Series A, Heavy Ion Physics (2001-01-01) 14: 141-148 , January 01, 2001

Two signatures of the quark-gluon plasma—strangeness ‘enhancement’ and *J/ψ* ‘suppression’—in nucleus-nucleus collisions at the SPS energies are critically discussed.

## A study of semi-classical processes in the elastic scattering of 32S by 64Ni and 58Ni by 27Al

### Acta Physica Hungarica Series A, Heavy Ion Physics (2003-01-01) 17: 151-160 , January 01, 2003

In order to determine the extent of the presence of semi-classical phenomena such as Fresnel and Fraunhofer patterns etc., we have analyzed the elastic scattering of ^{32}S by ^{64}Ni and ^{58}Ni by ^{27}Al using the McIntyre parametrization at several energies. The theoretical approach can reasonably account for the general pattern of the data, thus allowing us to extract the parameters pertinent to these semi-classical processes. The scattering of ^{58}Ni by ^{27}Al at 220, 185, 170, 160 and 155 MeV laboratory energies, exhibits features expected from the strong absorption model (SAM). However, the features of the scattering of ^{32}S by ^{64}Ni at 150, 108, 98, 93, 91, 88 and 82 MeV laboratory energies have significant deviation from the expected pattern of SAM.

## Jet-medium interactions: Wakes in the QCD medium

### Acta Physica Hungarica Series A, Heavy Ion Physics (2006-02-01) 27: 267-270 , February 01, 2006

We calculate the wake induced in a hot, dense QCD medium by a fast parton in the framework of linear response theory. We discuss two different scenarios: i) a weakly coupled quark gluon plasma (pQGP) described by hardthermal loop (HTL) perturbation theory and ii) a scenario where the plasma has the properties of a quantum liquid. We show that a Mach cone can appear in the second scenario, but not in the first one.

## Application and extrapolation of mean-field models in the heavy and superheavy regions

### Acta Physica Hungarica Series A, Heavy Ion Physics (2004-01-01) 19: 149-154 , January 01, 2004

Mean-field models have been quite successful in the description of bulk nuclear properties and the shell structure, so that they provide an attractive basis for the extrapolation of nuclear structure to the boundaries of the periodic system. We have investigated the performance of both Skyrmeforce and relativistic mean-field models for a larger sample of experimentally well known nuclei by comparing the predictions of various parameter sets corresponding to different versions of the models or simply distinguished by the data used for their fitting. This allows a critical evaluation of the uncertainty of extrapolation. The calculations show that while all parametrizations produce acceptable results in known nuclei, even the major magic shells predicted for the superheavy region depend on the choice of parameter set. The exact formulation and strength of the spin-orbit force appear to be the decisive factor. In addition a new formulation and parametrization of the relativistic point-coupling model with derivative and nonlinear terms is also discussed.

## Charge correlation in near-side hadron—Hadron jets at √s NN =200 GeV in PHENIX

### Acta Physica Hungarica Series A, Heavy Ion Physics (2006-02-01) 27: 241-244 , February 01, 2006

We analyze the relative azimuthal (Δϕ) distribution of same-charge and opposite-charge particle pairs. We then remove elliptic flow background using the ZYAM method. Comparisons between near angle Δϕ peak widths are presented for various centralities.

## Editors’ preface

### Acta Physica Hungarica Series A, Heavy Ion Physics (2006-02-01) 27: 187 , February 01, 2006

## Uncertainty relations expressed by means of information energies

### Acta Physica Hungarica Series A, Heavy Ion Physics (2003-01-01) 17: 19-26 , January 01, 2003

In this paper, we consider an alternative form of the uncertainty relation for quantum observables of discrete spectrum which makes use of socalled “information energy” as the measure of ancertainty. Then we apply this form of uncertainty relation to the particular case of two mutually orthogonal components of the spin-1/2 operator. We show that the use of this non-standard uncertainty measure simplifies the expression for spreads of observables and for the construction of the corresponding uncertainty relation.