We compute the electromagnetic charged kaon form factor in time-like region by employing a Poincar\'e covariant formalism of Bethe-Salpeter equation to study quark-antiquark bound states conjunction with Schwinger-Dyson for quark propagator. Following recent kindred calculation pion factor, we include most relevant intermediate composite particles permitted their quantum numbers interaction ker...

The strong decays of the π quark-antiquark states are investigated in the framework of the 3 P 0 meson decay model. It is found that the π(2070), η(2100), and η(2225) appear to be the convincing 4 1 S 0 q ¯ q states while the assignment of the η(2010) and η(2190) as the 4 1 S 0 isoscalar states is not favored by their widths. In the presence of the π(2070), η(2100), and η(2225) being the member...

We propose to use the KLOE data collected during the DAΦNE run at √ s = 1 GeV to search the σ(500) meson in γγ → ππ taking advantage of the reduction of Kaon backgrounds. Preprint No. FNT/T/2006-02

Using constituent quark model constraints we calculate the gluon and sea content of pions solely in terms of their valence density and the known sea and gluon densities of the nucleon. The resulting small-x predictions for g(x,Q) and q̄(x,Q) are unique and parameter free, being entirely due to QCD dynamics. Similar ideas are applied for calculating the gluon and sea content of kaons which, for o...

The pentaquarks are exotic baryons formed of four quarks and an antiquarks. Their existence has been discussed in the literature over the last 30 years or more, first in connection with kaon nucleon scattering data. The subject has been revived by the end of 2002 when experimental evidence of a narrow baryon of strangeness S = + 1, and mass M ≃ 1530 MeV has been found. This is interpreted as th...