1998/02/28 by N. N. Achasov, G. N. Shestakov · 1 citation
Physics and Astronomy · #Atomic and Subatomic Physics Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex #hep-ph
paper · pdf · doi:10.1103/physrevd.58.054011
published as Phys.Rev.D58:054011,1998 · 20 pages (RevTex), 5 figures (PS), minor typos corrected (in particular in Fig. 4), replaced to match the version accepted in Phys. Rev. D
arxiv created 1998/07/14 · openalex publication_date 1998/08/05 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
The observed alteration of the S-wave \ensuremathπ0\ensuremathπ0 mass spectrum in the reaction \ensuremathπ^\ensuremath-\stackrel\ensuremath→p\ensuremathπ0\ensuremathπ0n with increasing \ensuremath-t, i.e., the disappearance of a dip and the appearance of a peak in the region of the f0(980) resonance as \ensuremath-t increases, is explained by the contribution of the \ensuremathπ^\ensuremath-\stackrel\ensuremath→pf0(980)n reaction amplitude with the quantum numbers of the a1 Regge pole in the t channel. It is very interesting that nontrivial evidence for the a1 exchange mechanism in the reaction \ensuremathπ^\ensuremath-\stackrel\ensuremath→p\ensuremathπ0\ensuremathπ0n follows for the first time from the experiment on an unpolarized target. The explanation of the GAMS results suggested by us is compared with that reported previously. Two ways of experimentally testing these explanations are pointed out.