Resonances in p̄p→ηπ+π−π+π− at rest

✍ Scribed by A.V. Anisovich; D.V. Bugg; N. Djaoshvili; C. Hodd; J. Kisiel; L. Montanet; A.V. Sarantsev; B.S. Zou

• Publisher: Elsevier Science
• Year: 2001
• Tongue: English
• Weight: 347 KB
• Volume: 690
• Category: Article
• ISSN: 0375-9474
• DOI: 10.1016/s0375-9474(01)00349-9

✦ Synopsis

Data on pp → ηπ + π -π + π -at rest show two resonant processes: (a) f 0 (1370)η, f 0 (1370) → σ σ and ρρ, (b) η( 1440)σ , η(1440) → ηπ + π -. The branching ratio BR[f 0 (1370) → ρρ]/ BR[f 0 (1370) → σ σ ] = 0.98 ± 0.25 in the mass range available here. Using data on pp → ηπ 0 π 0 , the ratio Γ 4π /Γ 2π 5 for f 0 (1370). The effects of the strongly s-dependent width of f 0 (1370) are discussed in some detail.

The η( 1440) is observed decaying to ησ and a 0 (980)π, with strong destructive interference between them. In its decay to a 0 (980)π, a narrow peak appears in the ηπ mass spectrum, but 30-50 MeV above that usually attributed to a 0 (980) 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 a 0 (980) to ηπ above the KK threshold.