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arXiv · hep-ex/9712009

Study of the $ηπ^o$ system in the mass range up to 1200 MeV

D. Alde·F. G. Binon·M. Boutemeur·C. Bricman·S. V. Donskov·M. Gouanere·A. V. Inyakin·S. Inaba·V. A. Kachanov·G. V. Khaustov·E. A. Knapp·A. A. Kondashov·A. A. Lednev·V. A. Lishin·J. P. Peigneux·M. Poulet·Yu. D. Prokoshkin·S. A. Sadovsky·V. D. Samoylenko·P. M. Shagin·A. V. Singovsky·A. E. Sobol·J. P. Stroot·V. P. Sugonyaev·K. Takamatsu·T. Tsuru
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Abstract

The reaction $π^-p \to ηπ^o n$ has been studied with GAMS-2000 spectrometer in the secondary 38 GeV/c $π^-$-beam of the IHEP U-70 accelerator. Partial wave analysis of the reaction has been performed in the $ηπ^o$ mass range up to 1200 MeV. The $a_0(980)$-meson is seen as a sharp peak in S-wave. The $t$-dependence of $a_0(980)$ production cross section has been studied. Dominant production of the $a_0(980)$ at a small transfer momentum $t$ confirms the hypothesis of Achasov and Shestakov about significant contribution of the $ρ_2$ exchange ($I^GJ^{PC}=1^+2^{--}$) in the mechanism of $a_0(980)$ meson production in $t$-channel of the reaction.

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D. Alde, F. G. Binon, M. Boutemeur, C. Bricman, S. V. Donskov, M. Gouanere, A. V. Inyakin, S. Inaba, V. A. Kachanov, G. V. Khaustov, E. A. Knapp, A. A. Kondashov, A. A. Lednev, V. A. Lishin, J. P. Peigneux, M. Poulet, Yu. D. Prokoshkin, S. A. Sadovsky, V. D. Samoylenko, P. M. Shagin, A. V. Singovsky, A. E. Sobol, J. P. Stroot, V. P. Sugonyaev, K. Takamatsu, T. Tsuru. 1997-12-10. Study of the $ηπ^o$ system in the mass range up to 1200 MeV. https://doi.org/10.1063/1.56089

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