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Investigation of the ηη system in π-p interactions at a momentum of 32.5 GeV/c at the GAMS-4π spectrometer

par Binon, Freddy ;Stroot, Jean-Pierre ;Blik, A.;Donskov, Sergey;Kolosov, V.;Lednev, Andrey;Lishin, V.;Mikhailov, Yu;Polyakov, V.;Sadovsky, Sergey S.A.;Samoilenko, V.D. V.D.;Sobol, Andrei;Sugonyaev, Valentine;Khaustov, G.;Inaba, Susumu;Tsuru, Tsuneaki;Fujii, I.;Yasu, Yasushi;Peigneux, Jean Pierre;Takamatsu, Kunio;Shimizu, Hajime
Référence Physics of atomic nuclei, 68, 6, page (960-973)
Publication Publié, 2005

Article révisé par les pairs

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Résumé :

The ηη system produced in charge-exchange π-p interaction at a momentum of 32.5 GeV/c is studied in an experiment performed with the GAMS-4π spectrometer at the 70-GeV accelerator of the Institute for High-Energy Physics (IHEP, Protvino). A partial-wave analysis is performed in the mass range between 1.1 and 3.9 GeV for -t < 0.2 (GeV/c)2, S, D, G, and J waves being taken into account in this analysis. The S wave has a complicated structure, displaying peaks at about 1.5 and 1.7 GeV. These peaks are associated with the f0(1500) and f0(1710) mesons. One of the solutions (preferable one) involves the f0(2200) and f 2(1950) resonances. The mass region above 2.4 GeV is dominated by the G wave. A broad state of mass about 3 GeV and width 0.7 GeV is found in the J wave. The parameters of the resonances in question and their production cross sections are measured.© 2005 Pleiades Publishing, Inc.