An analysis of the contribution of isospin two ππ resonant states in the n̄p → π+π+π- annihilation reaction

A. Filippi, M. Agnello, M. Astrua, E. Botta, T. Bressani, D. Calvo, S. Costa, F. D'Isep, A. Feliciello, F. Iazzi, S. Marcello, B. Minetti, N. Mirfakhraee, F. Balestra, L. Busso, O. Denisov, L. Ferrero, R. Garfagnini, A. Grasso, A. MaggioraA. 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. Rozhdestvensky, 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

Research output: Contribution to journalArticlepeer-review

Abstract

The results of a search for a possible evidence of a π+π+ resonant state in the n̄p → π+π+π- 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. (C) 2000 Published by Elsevier Science B.V.

Original languageEnglish
Pages (from-to)284-288
Number of pages5
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume495
Issue number3-4
DOIs
Publication statusPublished - 14 Dec 2000
Externally publishedYes

Keywords

  • Antineutron-proton annihilation in flight in three charged pions
  • Isobar model
  • Isospin 2 resonant states
  • qq̄ exotic states

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