[en] We discuss the possibility of a nonvanishing spin tensor in relativistic hydrodynamics and its relevance to the description of Quark-Gluon-Plasma evolution in relativistic heavy ion collisions. After a short historical introduction, we report on some recent theoretical results for fully equilibrated fluids

[en] Ultrarelativistic gold-gold and proton-proton collisions are investigated in the experiments of the Relativistic Heavy Ion Collider (RHIC). In the last several years large amount of results were revealed about the matter created in these collisions. The latest PHENIX results for femtoscopy and correlations are reviewed in this paper. Bose-Einstein correlations of charged kaons in 200 GeV Au + Au collisions and of charged pions in 200 GeV p + p collisions are shown. They are both compatible with previous measurements of charged pions in gold-gold collisions, with respect to transverse mass or number of participants scaling

[en] We consider R-matrices, corresponding to the central (projective) extensions of orthogonal and symplectic groups, called Metagonal and Metaplectic groups, respectively.

[en] We present a summary of technological developments and tests of the MCP-based large-area detector aimed at precise timing and charged particles multiplicity measurements. Results obtained in the course of the development of isochronous (simultaneity) precise signal readout, passive summation of 1 ns signals, fast (1 GHz) front-end electronics, miniature vacuum systems, etc. could be potentially interesting for a number of future applications in different fields.

[en] We propose a description of the Higgs boson as top-antitop quark bound state within a nonlocal relativistic quark model of Nambu-Jona-Lasinio type. In contrast to models with local four-fermion interaction, in the nonlocal generalization the mass of the scalar bound state can be lighter than the sum of its constituents. A simultaneous description of the experimentally determined values for both, the top quark mass and the scalar Higgs boson mass, is achieved by adjusting the interaction range and the value of the coupling constant.

[en] We have studied the forward-backward correlations of charged-particle multiplicities in symmetric bins in pseudorapidity space in order to gain insight into the underlying correlations structure of particle production in case of ring-like and jet-like events of "1"6O-AgBr interactions at 60A GeV. The variance σ_c"2 of a suitably defined forward-backward asymmetry variable C has been determined. The experimental results confirm correlations of the produced particles in the forward and backward pseudorapidity regions for both ring-like and jet-like events.

[en] The masses of the recently reported by LHCb two pentaquark charmonium states P_c"∗(4380) and P_c"∗ (4450), which are supposed to have the configuration (uudcc"-), have been estimated in the framework of the quasiparticle model of diquarks considering [ud][uc]c-bar configuration. The masses are reproduced very well, which indicates that the description of a diquark as a quasiparticle is very useful for describing multiquark state and understanding the dynamics of it.

[en] We study inclusive χ_c_J production with definite polarizations in polarized proton-proton collisions at √s = 200 and 500 GeV at RHIC by using non-relativistic QCD (NRQCD) color-octet mechanism. We present results of rapidity distribution of χ_c_0, χ_c_1 and χ_c_2 production with specific polarizations in polarized p-p collisions at RHIC within the PHENIX detector acceptance range. We also present the corresponding results for the spin asymmetries.

[en] The problem of a new physical model test using observed experimental data is a typical one for modern experiments in high energy physics (HEP). A solution of the problem may be provided with two alternative statistical formalisms, namely frequentist and Bayesian, which are widely spread in contemporary HEP searches. A characteristic experimental situation is modeled from general considerations, and both the approaches are utilized in order to test a new model. The results are juxtaposed, which demonstrates their consistency in this work. An effect of a systematic uncertainty treatment in the statistical analysis is also considered.

[en] Earlier the 2-dimensional charge transport with parallel (in plane) magnetic field was considered from the theoretical point of view showing explicitly that the specific form of the emergent equation enforces the respective field solution to fulfil the Majorana condition. In this paper we review, explain and analyze these important results in the context of the generated physical effects, namely, the quantum ring as spin filter, the quantum Hall effect and a new one of pure topological origin (as described by the Aharonov-Casher theorems). The link with supersymmetrical models is briefly discussed.