The total and differential cross sections of high-energy pion-proton pion-pion scattering are investigated in a holographic QCD model, focusing on the Regge regime which Pomeron exchange gives dominant contribution to those sections. is described by Reggeized spin-2 particle propagator, hadron-Pomeron couplings given gravitational form factors hadrons, obtained from bottom-up AdS/QCD models. Si...

We calculate the electromagnetic form factor of the pion in quenched lattice QCD. The non-perturbatively improved Sheikoleslami-Wohlert lattice action is used together with the consistently O(a) improved current. We calculate the pion form factor for masses down to mπ = 360 M eV , extract the charge radius, and extrapolate toward the physical pion mass. In the second part, we discuss results fo...

We consider Gribov’s equation for inverse quark Green function with and without pion correction. With polar parametrization of inverse quark Green function, we relate the dynamical mass function without pion correction, M0(q ) and with pion correction, M(q) at low momentum. A graph is plotted for M(q) and M0(q ) with q for low momentum. It is found that at low momenta pion corrections are small...

By using chiral perturbation theory and the Uehling-Uhlenbeck equation we compute the viscosity of a pion gas, in the low temperature and low density regime, in terms of the temperature and the pion fugacity. The viscosity turns out to be proportional to the square root of the temperature over the pion mass. Next to leading corrections are proportional to the temperature over the pion mass to 3/2.

We study the behavior of the pion dispersion relation in a pion medium at finite density and temperature, introducing a chemical potential to describe the finite pion number density. Such description is particularly important during the hadronic phase of a relativistic heavy-ion collision, between chemical and thermal freeze-out, where the pion number changing processes, driven by the strong in...

We discuss two applications of the Virtuality Distribution Amplitudes (VDA) formalism developed in our recent papers. We start with an overview of the main properties of the pion distribution amplitude emphasizing the quantitative measures of its width, and possibility to access them through the pion transition form factor studies. We formulate the basic concepts of the VDA approach and introdu...

The feasibility of measuring the pion and kaon structure functions has been investigated. A high luminosity electron-proton collider would make these measurements feasible. Also, it appears feasible to measure these structure functions in a nuclear medium. Simulations using the RAPGAP Monte Carlo of a possible pion structure function measurement are presented. Understanding hadron structure fro...

We consider bosonisation of the low-energy QCD based on integrating the anomaly of the extended chiral (Eχ) transformation which depends both on pseudoscalar meson and scalar diquark fields as parameters. The relationship between extended chiral and usual chiral anomalies and related anomalous actions is studied. The effective action for the extended chiral field U depending on complete set of ...