383 research outputs found
The - and -vertices in light cone QCD
We study - and -vertices in the framework
of the light cone QCD sum rules and we estimate the coupling constants g and g utilizing -mixing. We
compare our results with the previous estimations of these coupling constants
in the literature obtained from phenomenological considerations.Comment: 8 pages, RevTex, 2 figure
The decay and the role of -meson
We study the radiative decay within the
framework of a phenomenological approach in which the contributions of
-meson and -meson intermediate states and of the pion-loops are
considered. We conclude that the -meson amplitude provides the dominant
contribution.Comment: 12 pages, LATEX, 3 PS figure
The -vertex in light cone QCD sum rules
We investigate the -vertex in the framework of light cone QCD sum
rules. We estimate the coupling constant g which is an essential
ingredient in the analysis of physical processes involving meson.
Our result is somewhat larger than the previous determinations of this coupling
constant.Comment: 8 pages, 1 figur
The -vertex in light cone QCD sum rules
We investigate the -vertex and estimate the coupling
constant g in the framework of the light cone QCD sum
rules. We compare our result with the values of this coupling constant deduced
from a phenomenological analysis of decays.Comment: 5 pages, RevTex, 1 Figur
The coupling constants g_{\rho\pi\gamma} and g_{\omega\pi\gamma} as derived from QCD sum rules}
We employ QCD sum rules to calculate the coupling constants
g and g by studying the three point
- and -correlation functions. Our results
for the decay widths and calculated using the obtained coupling constants are in good
agreement with the experimental values of these decay widths
Collisional Effects in Isovector Response Function of Nuclear Matter at Finite Temperature
The dipole response function of nuclear matter at zero and finite
temperatures is investigated by employing the linearized version of the
extended TDHF theory with a non-Markovian binary collision term. Calculations
are carried out for nuclear dipole vibrations by employing the
Steinwedel-Jensen model and compared with experimental results for
and .Comment: 14 pages, RevTex, 3 PS figure
Collisional Damping of Giant Monopole and Quadrupole Resonances
Collisional damping widths of giant monopole and quadrupole excitations for
Sn and Pb at zero and finite temperatures are calculated within
Thomas-Fermi approximation by employing the microscopic in-medium
cross-sections of Li and Machleidt and the phenomenological Skyrme and Gogny
forces, and are compared with each other. The results for the collisional
widths of giant monopole and quadrupole vibrations at zero temperature as a
function of the mass number show that the collisional damping of giant monopole
vibrations accounts for about 30-40% of the observed widths at zero
temperature, while for giant quadrupole vibrations it accounts for only 20-30%
of the observed widths of zero temperature.Comment: RevTex, 12 pages, 6 PS figure
Evaluation of social personalized adaptive E-Learning environments : end-user point of view
The use of adaptations, along with the social affordances of collaboration and networking, carries a great potential for improving e-learning experiences. However, the review of the previous work indicates current e-learning systems have only marginally explored the integration of social features and adaptation techniques. The overall aim of this research, therefore, is to address this gap by evaluating a system developed to foster social personalized adaptive e-learning experiences. We have developed our first prototype system, Topolor, based on the concepts of Adaptive Educational Hypermedia and Social E-Learning. We have also conducted an experimental case study for the evaluation of the prototype system from different perspectives. The results show a considerably high satisfaction of the end users. This paper reports the evaluation results from end user point of view, and generalizes our method to a component-based evaluation framework
On growth of spinodal instabilities in nuclear matter-II:asymmetric matter
As an extension of our previous work, the growth of density fluctuations in
the spinodal region of charge asymmetric nuclear matter is investigated in the
basis of the stochastic mean-field approach in the non-relativistic framework.
A complete treatment of density correlation functions are presented by
including collective modes and non-collective modes as well.Comment: 20 pages, 6 figures, Accepted by Physical Review
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