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Study of the centrally producer ?? andK $$\bar K$$ systems at 85 and 300 GeV/c

1991; Springer Nature; Volume: 51; Issue: 3 Linguagem: Inglês

10.1007/bf01548557

1431-5858

T. A. Armstrong, M. Benayoun, W. Beusch, I.J. Bloodworth, J.N. Carney, R. Childs, C. Evangelista, B.R. French, B. Ghidini, M. Girone, A. Jachołkowski, J. Kâhane, J.B. Kinson, A. Kirk, K. Knudson, V. Lenti, Ph. Leruste, A. Malamant, J.L. Narjoux, F. Navach, A. Palano, E. Quercigh, N. Redaelli, E. Rossi, Manibrata Sen, Rajarshi Sen, M. Stassinaki, M.T. Trainor, G. Vassiliadis, O. Villalobos Baillie, M.F. Votruba,

High-Energy Particle Collisions Research

We have studied the ππ andK $$\bar K$$ systems centrally produced in proton proton collisions at 300 GeV/c and π+/p proton collisions at 85 GeV/c using the CERN Ω spectrometer. Clear evidence forS */f o(975) production is observed. An analysis performed on the π+ π− mass spectrum in the 1.0 GeV region, using a coupled channel formalism, shows that it is possible to describe theS */f o(975) effect with one single resonance once interference of theS */f o(975) with theS-wave background is introduced. The resultingS */f o(975) parameters arem o =979±4MeV,g π =0.28±0.04,g K =0.56±0.18 corresponding to a pole position on sheet II at (1001±2)−i(36±4) MeV. Evidence is also found for a structure having a mass of 1472±12 MeV and a width of 195±33 MeV.