Study of the π+π+π-π- system centrally 0 produced by incident π+ andp beams at 85 GeV/c期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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Study of the π+π+π-π- system centrally 0 produced by incident π+ andp beams at 85 GeV/c

Authors:	T A Armstrong I J Bloodworth J N Carney B R French B Ghidini J B Kinson A Kirk V Lenti A Palano I C Print G Vassiliadis O Villalobos Baillie M F Votruba G Zito R Zitoun WA Collaboration

Institution:	1. CERN, CH-1211, Geneva 23, Switzerland 3. Physics Department, University of Birmingham, Birmingham, UK 4. Dip. di Fisica dell'Università and Sez. INFN, Bari, Italy 5. Nuclear Physics Department, Athens University, Athens, Greece 6. LPNHE, Universités de Paris VI et VII, Paris, France

Abstract:	The reactions π⁺ p→π⁺(π⁺π⁺π^-π^-)p andpp→p(π⁺π⁺π^-π^-)p, where the (π⁺ π⁺ π^- π^-) system is centrally produced have been studied at 85 GeV/c. The π⁺π⁺π^-π^- mass spectrum shows evidence for thef ₁ (1285) meson with a mass of 1278±2 MeV and width 41±12 MeV which decays mainly through ρ⁰(770)π⁺π^-. Thef ₁(1285) is also observed in the ηπ⁺π^- channel. There is no significant evidence for ηππ or 4π decay modes of thef ₁(1420). The ρ⁰ρ⁰ production is found to be small. A Dalitz plot analysis of the 3π system shows evidence fora ₂ (1320) production and for a large contribution of theJ ^PC=1⁺⁺ ρπ wave.

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