Study of pN annihilations into five pions Original Research Article

The preliminary analysis of four high statistic 5π data sets taken with the Crystal Barrel detector shows that at least two scalar states are needed to describe the data, the f0(1370) with m = 1395 ± 40 MeV/c2, Γ = 275 ± 55 MeV/c2 and the f0(1500) with mass and width compatible with previous findings. The first one decays dominantely into σσ and ϱϱ, the second one into σσ and π∗(1300)π. In addition to the dominant scalar intensity the π∗(1300) plays an important role in the 5π-dynamics. We found a mass of m = 1375 ± 40 MeV/c2 and a width of Γ = 268 ± 50 MeV/c2 with a dominat decay into ϱπ. The (ππ)sπ decay of the π∗(1300) is less than 15% of its ϱπ decay as expected for a radial excitation of the π.