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Study of the ηπ+π? system centrally producedin the reactionpp→p f (ηπ+π?)p s at 300 GeV/c |
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| Authors: | T A Armstrong R P Barnes M Benayoun W Beusch I J Bloodworth J N Carney D Di Bari C J Dodenhoff D Evans B R French B Ghidini M Girone A Jacholkowski J B Kinson A Kirk K Knudson V Lenti V Manzari F Navach A Palano E Quercigh M Sené R Sené G Vassiliadis O Villalobos Baillie M F Votruba |
| Institution: | 1. CERN, European Organization for Nuclear Research, Geneva, Switzerland 3. Physics Department, University of Birmingham, Birmingham, UK 4. Collège de France, Paris, France 5. Dipartimento di Fisica dell'Università and Sezione INFN, Bari, Italy 6. Nuclear Physics Department, Athens University, Athens, Greece |
| Abstract: | The reactionpp→p f (ηπ+π?)p s where the ηπ+π? system is centrally produced has been studied at 300 GeV/c incident momentum at the CERN Ω spectrometer. The ηπ± mass spectrum shows a strong δ/a 0(980) signal having a mass of 984±4 and Γ=95±14 MeV. The ηπ+π? mass spectrum shows η′ andf 1(1285) signals over little background. A spin-parity analysis of the ηπ+π? system shows evidence for aJ PC =1++ peak at thef 1(1285) mass but no evidence for the pseudoscalar states η(1270) andl/η(1440). No evidence is found for the ηππ decay of theE/f 1(1420) meson for which we set an upper limit BR(E/f 1(1420)→ηππ)<0.1 at 95% cl. |
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