The results of a search for a possible evidence of a π+π+ resonant state in the annihilation reaction with data collected by the OBELIX Experiment are presented. The study has been performed by means of a partial wave analysis in the frame of the isobar model. Production fractions for a possible π+π+ resonance have been evaluated. The observed effects at the π+π+ threshold may be described reasonably well by the contributions of f2(1270), f0(1500), f2(1565) and ρ(1450) states and their interferences, but a meaningful statistical indication for a π+π+ scalar state at about 1400 MeV emerges from the analysis.
|Titolo:||An analysis of the contribution of isospin two ππ resonant states in the -np -> π+π+π- annihilation reaction|
|Data di pubblicazione:||2000|
|Digital Object Identifier (DOI):||10.1016/S0370-2693(00)01276-4|
|Appare nelle tipologie:||1.1 Articolo in rivista|