An analysis of the contribution of isospin two $\pi \pi$ resonant states in the n.bar.p to $\pi^{+}\pi^{+}\pi^{-}$ annihilation reaction

The results of a search for a possible evidence of a pi /sup +/ pi /sup +/ resonant state in the np to pi /sup +/ pi /sup +/ pi /sup -/ 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 t...

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Detalles Bibliográficos
Autores principales: Filippi, A, Agnello, M, Astrua, M, Botta, E, Bressani, Tullio, Calvo, D, Costa, S, D'Isep, F, Feliciello, A, Iazzi, F, Marcello, S, Minetti, B, Mirfakhraee, N, Balestra, F, Busso, L, Denisov, O Yu, Ferrero, L, Garfagnini, R, Grasso, A, Maggiora, A, Panzarasa, A, Panzieri, D, Tosello, F, Bertin, A, Bruschi, M, Cannata, F, Capponi, M, De Castro, S, Donà, R, Galli, D, Giacobbe, B, Marconi, U, Massa, I, Piccinini, M, Poli, M, Cesari, N S, Spighi, R, Vagnoni, V M, Vecchi, S, Villa, M, Vitale, A, Zoccoli, A, Bianconi, A, Bonomi, G, Bussa, M P, Lodi-Rizzini, E, Venturelli, L, Zenoni, A, Cicalò, C, De Falco, A, Masoni, A, Puddu, G, Serci, S, Usai, G L, Gorchakov, O E, Prakhov, S N, Rozhdestvensky, A M, Tretyak, V I, Gianotti, P, Guaraldo, C, Lanaro, A, Lucherini, V, Petrascu, C, Filippini, V, Fontana, A, Montagna, P, Rotondi, A, Salvini, P, Tessaro, S
Lenguaje:eng
Publicado: 2000
Materias:
Particle Physics - Experiment
Acceso en línea:https://dx.doi.org/10.1016/S0370-2693(00)01276-4
http://cds.cern.ch/record/504124
Descripción
Sumario:The results of a search for a possible evidence of a pi /sup +/ pi /sup +/ resonant state in the np to pi /sup +/ pi /sup +/ pi /sup -/ 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 pi /sup +/ pi /sup +/ resonance have been evaluated. The observed effects at the pi /sup +/ pi /sup +/ threshold may be described reasonably well by the contributions of f/sub 2/(1270), f /sub 0/(1500), f/sub 2/(1565) and rho (1450) states and their interferences, but a meaningful statistical indication for a pi /sup +/ pi /sup +/ scalar state at about 1400 MeV emerges from the analysis. (14 refs).

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