Regular Series

Vol. 26 (1995), No. 5, pp. 875 – 974


An Embedding of a Schwarzschild Black Hole in Terms of Elementary Functions

Acta Phys. Pol. B 26, 875 (1995)

page 875 •

abstract

We give a six dimensional embedding for the Schwarzschild solution which is described by elementary functions only.


The Moyal Deformation of the Second Heavenly Equation

Acta Phys. Pol. B 26, 889 (1995)

page 889 •

abstract

Some technique of reduction of the sdiff(\({\mit \Sigma }^2\)) SDYM equations to the second heavenly equation is proposed. Then it is shown that the same technique leads from the Moyal SDYM equations to the Moyal deformation of the second heavenly equation. The iterative solution of this latter equation is discussed.


The BRST Analysis of the Stückelberg Formalism

Acta Phys. Pol. B 26, 903 (1995)

page 903 •

abstract

The Stückelberg formalism can be regarded as a field-enlarging transformation that introduces an additional gauge symmetry to the considered model. We define and calculate the appropriate BRST charge. The physical state condition, demanding that a physical state is to be annihilated by the BRST charge, is shown to be equivalent to the Stückelberg physical state condition. Several applications of the approach to the formalism are presented. The comparison with the BFV procedure is given.


From Unpolarized to Polarized Quark Distributions in the Nucleon

Acta Phys. Pol. B 26, 913 (1995)

page 913 •

abstract

Starting from Martin, Roberts and Stirling fit for unpolarized deep inelastic structure functions and using experimental data on spin asymmetries we get a fit which provides polarized quark distributions. We analyze the behaviour of such functions near \(x\) equal to 1. The first moments of these distributions are also discussed. Our fit prefers combination of proton and neutron data versus proton-deuteron one.


Testing the Vector Condensate Model of Electroweak Interactions at High Energy \(e^+e^-\) Colliders

Acta Phys. Pol. B 26, 921 (1995)

page 921 •

abstract

The vector condensate model is a version of the standard model where the symmetry is broken dynamically by introducing a doublet of vector fields leading to massive spin-one particles (\(B^{\pm }, B^0, \overline {B^0}\)) and preserving the main features of the standard model. The \(B\)-particles are heavy (\(m_B \gtrsim 42.7\) GeV) and the model has a low momentum scale (\(\lesssim 2.6\) TeV). In the present note we point out that \(B\)-particles are copiously produced in \(e^+e^- \to B \bar B, B \bar B Z\) at LEP 200 and high energy \(e^+e^-\) colliders almost in the whole possible mass range.


Possible Enhancement of Interferometry Methods in Heavy Ion Collisions

Acta Phys. Pol. B 26, 925 (1995)

page 925 •

abstract

Interferometry methods have become a well established technique in heavy ion collisions experiments. We present the method for obtaining a more comprehensive information about the spatial structure of source emitting identical particles. It is shown that this information can be extracted by a one dimensional Fourier analysis of the filtered correlation function. Further possible enhancement of the method is sketched. Some technical aspects of the proposed technique are discussed.


Spectroscopy of Positrons from Heavy-Ion Atom Collisions at Coulomb Barrier Energies

Acta Phys. Pol. B 26, 939 (1995)

page 939 •

abstract

The EPOS experiments at the UNILAC accelerator of GSI are reviewed as an example of the development of positron spectroscopy in heavy-ion collisions. The phenomenon of anomalous lines observed in inclusive positron spectra and in electron-positron sum energy spectra as well as the derivation of background of nuclear and atomic positrons is discussed. The article closes with an outlook on a new generation of the experiments currently started with considerably upgraded instruments.


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