Searcharxiv⌕ Search

arXiv subjects

A. Z. Dubnickova

Publications and source records attributed to A. Z. Dubnickova.

23 records · Page 2Linked to original sources
arXiv2002

Asymptotic conditions for electromagnetic form factors of hadrons represented by VMD model

A system of linear homogeneous algebraic equations for coupling constant ratios of vector-mesons to hadrons is derived by imposing an asymptotic behaviuor upon the VMD pole parametrization of an hadron electromagnetic form factor. A similar system of equations with a simpler structure of coefficients, taken as even powers of vector-meson masses, is derived by means of integral superconvergent sum rules for the imaginary part of the considered from factor using its appropriate delta function approximation. Although both systems have been derived starting from different properties of the electromagnetic form factor and they look each in its own way, it is shown explicitly that they are fully equivalent.

hep-ph↗
arXiv2001

Strange Vector Form Factor of Kaons

Starting from the $ω$-$ϕ$ mixing, further assuming the coupling of the quark-current of some flavour to be of universal strenth exclusively to the component of vector-meson wave function with the same flavour and finally taking numerical values of the coupling constant ratios $(f_{ωK \bar K}/f_ω^e)$, $(f_{ϕK\bar K/f_ϕ^e)$ from the isoscalar part of a realistic six-resonance unitary and analytic model of the kaon electromagnetic structure, the strange-quark vector current form factor behaviour of K-mesons in space-like and time-like regions is predicted.

hep-ph↗
arXiv2001

Unitary and Analytic Models in Particle Physics Phenomenology

After two decades of a development of the unitary and analytic models of the electromagnetic structure of hadrons and nuclei their main principles are briefly formulated, then a general scheme of their applications to the electromagnetic, weak and strong interaction processes are traced out and finally, some results of their successful applications are reviewed.

hep-ph↗
arXiv2000

Non-Standard Model of the Nucleon Electromagnetic Structure and its Predictability

Unitary and analytic ten-resonance model of the nucleon electromagnetic (e.m.) structure with canonical normalizations and asymptotics is constructed on a four-sheeted Riemann surface. It describes well all existing experimental space-like and time-like data on the nucleon e.m. form factors (ff's), including also FENICE (Frascati) results on the neutron, for the first time. This is achieved without any external constraints on the isovector spectral functions following from the piN-scattering data and pion e.m. ff behaviour through the unitarity condition. Just opposite, the model itself predicts a pronounced effect of the two-pion continuum on the isovector spectral functions revealing the strong enhancement of the left wing of the rho(770)-resonance close to two-pion threshold. The existence of the fourth excited state of the rho(770) meson with parameters mass and width equal to 2506 MeV and 700 MeV, respectively. The isoscalar spectral function behaviours are predicted by the presented model.

hep-ph↗