Archivio Istituzionale della RicercaThe 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.
An analysis of the contribution of isospin two ππ resonant states in the -np -> π+π+π- annihilation reaction / A., Filippi; Agnello, Michelangelo; M., Astrua; E., Botta; T., Bressani; D., Calvo; S., Costa; F., D'Isep; A., Feliciello; Iazzi, Felice; S., Marcello; Minetti, Bruno; N., Mirfakhraee; F., Balestra; L., Busso; O., Denisov; L., Ferrero; R., Garfagnini; A., Grasso; A., Maggiora; A., Panzarasa; D., Panzieri; F., Tosello; A., Bertin; M., Bruschi; F., Cannata; M., Capponi; S., De Castro; R., Donà; D., Galli; B., Giacobbe; U., Marconi; I., Massa; M., Piccinini; M., Poli; N., Semprini Cesari; R., Spighi; V., Vagnoni; S., Vecchi; M., Villa; A., Vitale; A., Zoccoli; A., Bianconi; G., Bonomi; M. P., Bussa; E., Lodi Rizzini; L., Venturelli; A., Zenoni; C., Cicalò; A., De Falco; A., Masoni; G., Puddu; S., Serci; G., Usai; O. E., Gorchakov; S. N., Prakhov; A. M., Rozhdestvenskyg; V. I., Tretyak; P., Gianotti; C., Guaraldo; A., Lanaro; V., Lucherini; C., Petrascu; V., Filippini; A., Fontana; P., Montagna; A., Rotondi; P., Salvini; S., Tessaro. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 495:3-4(2000), pp. 284-288. [10.1016/S0370-2693(00)01276-4]
An analysis of the contribution of isospin two ππ resonant states in the -np -> π+π+π- annihilation reaction
AGNELLO, MICHELANGELO;IAZZI, Felice;MINETTI, Bruno;
2000
Abstract
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.
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https://hdl.handle.net/11583/1407382
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