Determination of the strangeness content of light-flavour isoscalars from their production rates in hadronic Z decays at LEP

A new phenomenological approach is suggested for determining the strangeness content of light-flavour isoscalars. This approach is based on phenomenological laws of hadron production related to the spin, isospin, strangeness content and mass of the particles. From the total production rates per hadronic Z decay of all light-flavour hadrons, measured so far at LEP, the values of the nonstrange-strange mixing angles are found to be |\phi_P| = 42.3^{\circ} \pm 3.5^{\circ}, |\phi_V| = 10^{\circ} \pm 8^{\circ}, |\phi_T| = 16^{\circ} \pm 11^{\circ} and |\phi_S| = 13^{\circ} \pm 9^{\circ}. Our results on the \eta-\eta^{\prime}, \omega-\phi and f_2-f_2^{\prime} isoscalar mixing are consistent with the present experimental evidence. The strangeness content obtained for the f_0(980) scalar/isoscalar is not consistent with the values supported by recent model studies and is discussed further in the framework of our approach and the K-matrix analysis.Comment: Talk given at the 9th International Conference on Hadron Spectroscopy (Protvino, 2001), 4 pages with 2 figure

Study of charge multiplicity in hadronic three-jet Z decays at LEP

The mean charge multiplicity in hadronic three-jet Z decays has been measured with the DELPHI detector as a function of the event topology and compared with recent theoretical calculations. The QCD colour factor ratio C_A/C_F was determined, and the gluon contribution to this multiplicity was extracted giving a measurement of the mean charge multiplicity of a two-gluon colour-singlet system as a function of the effective c.m. energy covering the range from 16 to 52 GeV.Comment: Talk given at the 32nd International Symposium on Multiparticle Dynamics (ISMD 2002), Alushta, Ukraine, September 7 - 13, 2002; 4 pages with 2 eps-figure

Analyzing Parallel Computation of the Functions Created with R-operations in CUDA

Brief overview of the recent general tasks for parallel computation on graphics processing units is represented. Adequacy of the parallel computation approach for single analytic function constructed with R-operations is carried out. Brief overview of ray tracing technique and its connection with constructive apparatus of R-functions is considered. Sample comparison calculations to show the benefits of CUDA are provided

Algorithms and JavaScript Programs in Calculation of R-Functions and Producing Their Two- and Three-Dimensional Charts

Usage of HTML5 canvas element suitable for two- and three-dimensional charts of the function is unveiled. Appliance of JavaScript dynamics to this element is implemented. R-functions and level curves construction details are specified. Two- and three-dimension function charts are represented

Object recognition using infrared cameras

The need in effective computer vision capable of recognizing objects in any environment and condition is rapidly increasing. Thermal imaging cameras with active elimination can provide much better object recognition results in in the dark or general poor visibility conditions, such as fog, snow, rain or dust. Applying regular neural network image recognition algorithms on IR camera systems can yield very promising results

N=2 supersymmetric Yang-Mills theory and the superparticle: twistor transform and kappa-symmetry

Lagrangian and Hamiltonian dynamics of de Azcarraga-Lukierski N=2 massive superparticle is considered in the framework of twistor-like Lorentz-harmonic approach. The emphasis is on the study of the interaction with external Abelian gauge superfield. The requirement of preservation of all gauge symmetries of the free model including kappa-symmetry yields correct expressions for the superfield strength constraints and determines the form of nonminimal interaction. We also show that for de Azcarraga-Lukierski N=2 massive superparticle the pullback of field strength 2-superform to the superworld line is not integrable in contrast to the massless superparticle.Comment: 16 pages, LaTe

GPS навигация для мобильных робототехнических систем

There is a multitude of ways in which mobile robotic system can orient itself in a