Role of the rho meson in the description of pion electroproduction experiments at JLab

We study the p(e,e' pi+)n reaction in the framework of an effective Lagrangian approach including nucleon, pi and rho meson degrees of freedom and show the importance of the rho-meson t-pole contribution to sigmaT, the transverse part of cross section. We test two different field representations of the rho meson, vector and tensor, and find that the tensor representation of the rho meson is more reliable in the description of the existing data. In particular, we show that the rho-meson t-pole contribution, including the interference with an effective non-local contact term, sufficiently improves the description of the recent JLab data at invariant mass W less 2.2 GeV and Q2 less 2.5 GeV2/c2. A ``soft'' variant of the strong piNN and rhoNN form factors is also found to be compatible with these data. On the basis of the successful description of both the sigmaL and sigmaT parts of the cross section we discuss the importance of taking into account the sigmaT data when extracting the charge pion form factor Fpi from sigmaL.Comment: 23 pages, 6 figures, accepted for publication in Phys. Rev.

POLLUTION OF THE ATMOSPHERE OF RUSSIA IN 2017

The need to study emissions of pollutants into the air of the constituent entities of the Russian Federation is determined by the importance of this resource for ensuring the life of citizens

DEVELOPMENT OF UX DESIGN METHODS WITHIN THE QT FRAMEWORK

A new approach to the development of graphical application interfaces is proposed, synchronizing three processes: design, prototyping and software implementation. In addition, a method for visualizing a UX project using UML elements is proposed