Research project

My main current research project with my group is about the derivation of low energy hadrons couplings and properties such as averaged quadratic radii or form factors more focused in the framework of the Constituent quark model from QCD level calculations.  Polarization processes, by considering typical QCD-processes such as one-gluon exchange, are used to investigate the manifestation of flavor symmetry breaking in the effective level of hadrons. Effects of form factors (derived analytically) for nucleon and nuclear potentials are investigated in the vacuum and under finite energy density, such as in external magnetic fields. For that, the one meson exchange processes are also analyzed under finite energy density, i.e. magnetic fields. Descriptions of the type of the Nambu-Jona-Lasinio (NJL) model - and other effective models - are also obtained and articulated. Among these effects, different mechanisms for quarks and mesons mixings are obtained and analyzed. Due to mixings, it is possible to describe some strangeness, charm and beauty content in the sea quarks of light mesons such as the pion.  Effective three meson interactions that break UA(1) symmetry are employed to investigate (strong) light meson decays that may lead to CP violation. Besides that, aspects of structure and interactions of mesons with quarks charm and b/anti-b (beauty or bottom) are also considered by verifying to what extent NJL-like models are able to describe them. These subjects are considered both in the vacuum and under finite energy density, eg. finite background electromagnetic fields, weak or strong. The emergence of non-renormalized models derived from renormalizable theories are also addressed. Besides these issues, new solutions for the classical Yang-Mills equations, SU(Nc=3 or 2) are under work for different configurations of the color-charge distribution. Their possible relevance for the full quantum system is also under scrutiny.