A knowledge of the radial distributions of quarks inside hadrons could lead to a better understanding of the QCD description of these hadrons and possibly suggest forms for phenomenological models. As a step in this direction, we have measured the charge (vector) and matter (scalar) densities of a heavy-light meson. More explicitly, the heavy-light meson is simplified to being an infinitely hea...

The cross sections for J/c absorption by p and r mesons are studied in a meson-exchange model that includes not only pseudoscalar-pseudoscalar-vector-meson couplings but also three-vector-meson and fourpoint couplings. We find that they are much larger than in a previous study where only pseudoscalarpseudoscalar-vector-meson couplings were considered. Including form factors at interaction verti...

The strange-quark vector current ρ-to-π meson transition form factor is computed at one-loop order using strange meson intermediate states. A comparison is made with a φ-meson dominance model estimate. We find that one-loop contributions are comparable in magnitude to those predicted by φ-meson dominance. It is possible that the one-loop contribution can make the matrix element as large as thos...

We report on progress in the development of a microscopic model for the hyperon-nucleon interaction within the meson-exchange framework, which incorporates both one-meson as well as correlated two-meson exchange contributions. The main new feature of the model is the exchange of two correlated pions or kaons, both in the scalar-isoscalar and the vector-isovector channels. In the scalar channel ...

The intrinsic electromagnetic nuclear meson exchange charge and current operators arising from a separation of the center-of-mass motion are derived for a one-boson-exchange model for the nuclear interaction with scalar, pseu-doscalar and vector meson exchange including leading order relativistic terms. Explicit expressions for the meson exchange operators corresponding to the different meson t...

In this work we give a theoretical description of the elastic vector meson production in diffractive DIS developed within the kt-factorization formalism. Since the kt-factorization scheme does not require large values of Q+mV , we conduct an analysis that is applicable to all values of Q from photoup to highly virtual production of vector mesons. The basic quantity in this approach — the uninte...

We study the structure of the nuclear force by using a path-integral hadronization approach in a chiral quark-diquark model. After the construction of the chiral quark-diquark model, we hadronize it to obtain a meson-baryon Lagrangian. The effective meson-baryon Lagrangian incorporates chiral symmetry and the composite description of the mesons and baryons. Using the effective meson-baryon Lagr...

The prominent feature of the η meson is that it couples dominantly to the N(1535) (S11) resonance at threshold energies. The low-momentum η meson would then mainly excite N–nucleon-hole (N-h) states in nuclear matter. Therefore the η meson nuclear dynamics is sensitive to modifications of nucleon and N properties in medium. If some medium effects and/or a density increase bring the N-h state do...

In the heavy quark limit inclusive production rate of a heavy meson can be factorized, in which the nonperturbative effect related to the heavy meson can be characterized by matrix elements defined in the heavy quark effective theory. Using this factorization, predictions for the full spin density matrix of a spin-1 and spin-2 meson can be obtained and they are characterized only by one coeffic...