par Donskov, Sergey;Inyakin, Alexandre A.V.;Kachanov, Vasilij V.A.;Khaustov, G.;Kulik, Alexei A.V.;Lednev, Andrey;Polovnikov, Sergey S.A.;Prokoshkin, Yu Y.D.;Sadovsky, Sergey S.A.;Samoylenko, Vladimir;Shagin, Petr P.M.;Shtannikov, A.V. A.V.;Singovsky, Alexandre A.V.;Sugonyaev, Valentine;Bricman, Charles 
;Stroot, Jean-Pierre ;Gouanère, M.;Peigneux, Jean Pierre;Poulet, Maurice;Alde, D.;Knapp, Edward E.A.;Inaba, Susumu;Kobayashi, Makoto;Tsuru, Tsuneaki;Binon, Freddy ;Kinashi, Tomoko;Boutemeur, Madjid;Nakamura, Teruo;Takamatsu, Kunio; [et al.]
Référence Physics of atomic nuclei, 60, 3, page (386-390)
Publication Publié, 1997-03
;Stroot, Jean-Pierre ;Gouanère, M.;Peigneux, Jean Pierre;Poulet, Maurice;Alde, D.;Knapp, Edward E.A.;Inaba, Susumu;Kobayashi, Makoto;Tsuru, Tsuneaki;Binon, Freddy ;Kinashi, Tomoko;Boutemeur, Madjid;Nakamura, Teruo;Takamatsu, Kunio; [et al.]Référence Physics of atomic nuclei, 60, 3, page (386-390)
Publication Publié, 1997-03
Article révisé par les pairs
| Résumé : | The spin-parity of the ηπ0π0 system from the charge-exchange transition π-p → ηπ0π0n is analyzed for mass values up to 1.9 GeV. Data used in this analysis come from the GAMS-4000 multiphoton spectrometer irradiated by a 100-GeV/c π- beam of the SPS accelerator at CERN. Experimental mass spectra show distinct signals from the pseudoscalar mesons η(1295) and ι/η(1440) and from the axial-vector meson D/f1(1285). The values found for their masses and widths agree well with the world-average values. The cross sections for the production of the above mesons are measured, and the relative branching fractions for some of their decays are estimated. The decay η(1295) → ηπ0π is found to be dominated by the a0(980)π0 channel. On the other hand, the decay ι/η(1440) → a0(980)π0 is dominated by the η(π0π0)S channel, whereas the a0(980)π0 contribution is small. This suggests that t is an exotic meson with a significant component of valence gluons. |
