Mesons and tetraquarks

por Francisco Fernández (Universidad de Salamanca)

jueves 29 abr. 2004 16:00 → 17:00 Europe/Madrid

Sala Seminarios (Dpto. de Física Teórica (UVEG))

The exciting scenario created by the new data obtained at BaBar, CLEO, FOCUS and Belle claims for a comprehensive study where two and four-quark states are simultaneously addressed in a trial to disentangle the quark structure of the new experimental data. The work we present is based in a quark-quark interaction obtained from basic properties of QCD that allows for a study of the whole meson spectra and multiquark states preserving the description of the NN interaction and the baryon spectrum. We show results for the meson spectra, from the light pseudoscalars to bottomonium, including open-flavor mesons. We show also results for tetraquark structures made of $qq\bar q \bar q$, $Qq\bar q\bar q$ and $qq\bar Q\bar Q$,where q stands for a light or strange quark and Q for charm or bottom. Comparison to data allows an identification of non well-established states.