Resonances in pp¯ → ηπ+π−π+π− at rest

Data on pbarp-> eta pi sup +pi sup -pi sup +pi sup - at rest show two resonant processes: (a) f sub 0 (1370)eta,f sub 0 (1370)-> sigma sigma and rho rho, (b) eta(1440)sigma, eta(1440)-> eta pi sup +pi sup -. The branching ratio BR[f sub 0 (1370)-> rho rho]/BR[f sub 0 (1370)-> sigma sigma]=0.98+-0.25 in the mass range available here. Using data on pbarp-> eta pi sup 0 pi sup 0 , the ratio GAMMA sub 4 subpi/GAMMA sub 2 subpi>=5 for f sub 0 (1370). The effects of the strongly s-dependent width of f sub 0 (1370) are discussed in some detail. The eta(1440) is observed decaying to eta sigma and a sub 0 (980)pi, with strong destructive interference between them. In its decay to a sub 0 (980)pi, a narrow peak appears in the eta pi mass spectrum, but 30-50 MeV above that usually attributed to a sub 0 (980) and significantly above the KK threshold. This effect is explained naturally by a two-step process: eta(1440)->K sup * (890)K followed by rescattering of the two kaons through a sub 0 (980) to eta pi above the KK threshold.