8,177 research outputs found
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
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