Resonances in p̄p→ηπ+π−π+π− at rest Original Research Article

Data on View the MathML source at rest show two resonant processes: (a) View the MathML source and ρρ, (b) η(1440)σ, η(1440)→ηπ+π−. The branching ratio View the MathML source in the mass range available here. Using data on View the MathML source, the ratio View the MathML source for View the MathML source. The effects of the strongly s-dependent width of View the MathML source are discussed in some detail. The η(1440) is observed decaying to ησ and View the MathML source, with strong destructive interference between them. In its decay to View the MathML source, a narrow peak appears in the ηπ mass spectrum, but 30–50 MeV above that usually attributed to View the MathML source and significantly above the KK threshold. This effect is explained naturally by a two-step process: η(1440)→K∗(890)K followed by rescattering of the two kaons through View the MathML source to ηπ above the KK threshold.