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IHEP 98 - 23
D.Alde, E.A.Knapp (LANL, Los Alamos USA), F.G.Binon (ULB, Brussels, Belgium), M.Boutemeur (CERN, Geneva, Switzerland), C.Bricman, J.P.Stroot (IISN, Brussels, Belgium), S.V.Donskov, A.V.Inyakin, V.A.Kachanov, G.V.Khaustov, A.A.Kondashov, A.A.Lednev, V.A.Lishin, Yu.D.Prokoshkin, S.A.Sadovsky, V.D.Samoilenko, P.M.Shagin, A.V.Sin'govsky, V.P.Sugonyaev ( IHEP, Protvino, Russia), M.Gouanere, J.P.Peigneux, M.Poulet (LAPP, Annecy, France), S.Inaba, T.Tsuru (KEK, Tsukuba, Japan), K.Takamatsu (MU, Miyazaki, Japan)
Study of the pi0 pi0 -system with the GAMS-4000 spectrometer at 100 GeV/c
Protvino, 1998.- p.24, figs. 11, refs.:25.

The pi0 pi0 -system produced in the charge exchange pi- p -reaction at 100 GeV/c has been studied. The experiment was performed at the CERN SPS accelerator with the multiphoton hodoscope spectrometer GAMS-4000. A partial wave analysis was carried out in the mass range from 0.8 GeV to 3.0 GeV at -t < 0.2 (GeV/c)**2 with the S, D, G and J waves. The S -wave exhibited rather complicated behaviour with a series of four bumps separated by three dips, at 1 GeV, 1.5 GeV and 2 GeV, which give the evidence for several scalar resonances. Clear peaks corresponding to the f_2(1270), f_4(2050) and f_6(2510) mesons were seen in the higher waves. All the three mesons were produced via a dominating one pion t -channel exchange. The parameters and production cross sections of these mesons were measured.

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