Estudo do decaimento e da fotoprodução de f1 (1285)

Abstract

The resonance f 1 (1285), with quantum numbers I G (J PC ) = 0 + (1 ++ ), mass 1281; 9 0; 5 MeV=c 2 and total decay width 22; 7 1; 1 MeV, has been the subject of many studies, both in the experimental and theoretical points of view. In this context, both radioactive decay and meson photoproduction are useful tools to investigate the properties of these hadrons, especially their internal structure. For this purpose, we use the Regge Theory to calculate the photoproduction cross section p ! f (1285)p: In this formalism is foreseen the exchange of reggeons between the particles involved in the collision. In the process in study the reggeons to be exchanged are the vector mesons (V ) and !. The information on the internal structure of the f 1 1 (1285) resonance is related to the coupling of the f V vertex, which, in turn, can be related to the radioactive decay of f (1285) ! V . The radioactive decay of f 1 1 (1285) is obtained through a non-relativistic model. As a result, we obtained the rate of radioactive decay f 1 !

= 1608; 11 keV and = 214; 00 keV and, based on these results, we estimate the internal structure of f 1 f 1 !

(1285). The results for the photoproduction cross section did not agree with the CLAS data, which suggests that we should consider other contributions to the cross section, such as the particle exchange in the u-channel.