Investigation of the {eta}{eta} System in {pi}{sup -}p Interactions at a Momentum of 32.5 GeV/c at the GAMS-4{pi} Spectrometer

• Published in: Physics of atomic nuclei 2005-06, Vol.68 (6)
• Main Authors: Binon, F., Stroot, J.P., Blik, A.M., Donskov, S.V., Kolosov, V.N., Lednev, A.A., Lishin, V.A., Mikhailov, Yu.V., Polyakov, V.A., Sadovsky, S.A., Samoilenko, V.D., Sobol, A.E., Sugonyaev, V.P., Khaustov, G.V., Inaba, S., Tsuru, T., Fujii, I., Yasu, Y., Peigneux, J.P., Takamatsu, K.
• Format: Article
• Language: English
• Subjects: CHARGE EXCHANGE; CROSS SECTIONS; ETA MESONS; F0-1590 MESONS; F0-1730 MESONS; F2-2010 MESONS; GEV RANGE; MULTIPARTICLE SPECTROMETERS; PARTICLE WIDTHS; PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; PION MINUS REACTIONS; PION-PROTON INTERACTIONS; PIONS MINUS; RESONANCE PARTICLES; REST MASS; S WAVES
• ISSN: 1063-7788; 1562-692X
• DOI: 10.1134/1.1954822

The {eta}{eta} system produced in charge-exchange {pi}{sup -}p interaction at a momentum of 32.5 GeV/c is studied in an experiment performed with the GAMS-4{pi} 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){sup 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 f{sub 0}(1500) and f{sub 0}(1710) mesons. One of the solutions (preferable one) involves the f{sub 0}(2200) and f{sub 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.