Estudo da fotoprodução e decaimento de f2(1270)

Abstract

The resonance f2(1270) of mass 1275.5 ± 0.8 MeV, quantum numbers IG(JPC) = 0+(2++) and width of total decay 186.6+2.8 −2.2 MeV, is considered, according to the quark model, a simple q¯q pair, however it is found in literature several other models for its structure. In this context, in this master’s work, we use radioactive decay and photoproduction of mesons as tools to investigate the internal structure of the f2(1270) meson. We use the Regge Model to calculate the cross section, considering the photoproduction process γp → f2(1270)p, where we consider that the main contribution to the cross section for −t ≤ 1, 2GeV2 is related to the exchange of vector mesons ρ (of quantum numbers IG(JPC) = 1+(1−−) and mass 775, 26 ± 0, 23 MeV) and ω (from quantum numbers IG(JPC) = 0−(1−−) and mass 782, 66 ± 0, 13 MeV) in the t channel. Radioactive decay is obtained through a non-relativistic model. We calculated the decay of the f2(1270) meson into the ρ and ϕ mesons and obtained as a result Γf2→γρ0 = 566, 24 KeV and Γf2→γϕ = 150, 88 KeV.