E/iota Decays To K(k)over-bar-pi In (p)over-barp Annihilation At Rest

Bertin, A.; Bruschi, M.; Cereda, B.; Decastro, S.; Ferretti, A.; Galli, D.; Giacobbe, B.; Marconi, U.; Poli, M.; Piccinini, M.; Semprinicesari, N.; Spighi, R.; Vecchi, S.; Vezzani, A.; Vigotti, F.; Villa, M.; Vitale, A.; Zoccoli, A.; Corradini, M.; Donzella, A.; Rizzini, E. L.; Venturelli, L.; Zenoni, A.; Cicalo, C.; Lai, A.; Masoni, A.; Musa, L.; Puddu, G.; Serci, S.; Temnikov, P. P.; Usai, G.; Ableev, V. G.; Denisov, O. Y.; Rozhdestvensky, A. M.; Sapozhnikov, M. G.; Tretyak, V. I.; Gianotti, P.; Guaraldo, C.; Lanaro, A.; Lucherini, V.; Nichitiu, F.; Petrascu, C.; Rosca, A.; Cavion, C.; Gastaldi, U.; Maron, G.; Morando, M.; Bendiscioli, G.; Filippini, V.; Fontana, A.; Montagna, P.; Rotondi, A.; Saino, A.; Salvini, P.; Balestra, Ferruccio; Botta, Elena; Bressani, Tullio; Bussa, Maria Pia; Busso, Luigi; Calvo, D.; Cerello, P.; Costa, Sergio; Feliciello, A.; Ferrero, Livio; Filippi, A.; Garfagnini, Raffaello; Grasso, Antonino; Maggiora, A.; Marcello, Simonetta; Mirfakhrai, N.; Panzieri, Daniele; Parena, D.; Rossetto, E.; Tosello, F.; Zosi, Gianfranco; Agnello, M.; Iazzi, F.; Minetti, B.; Pauli, G.; Tessaro, S.; Santi, L.

doi:10.1016/0370-2693(95)01136-E

The results of the analysis of 3940 (K (K) over bar pi)pi pi events from a sample of 18 millions (p) over bar p annihilations in the liquid hydrogen target of the OBELIX spectrometer at LEAR (CERN) are presented. The presence of two pseudoscalar states at 1.416 +/- 0.002 GeV/c(2), with width 0.050 +/- 0.004 GeV/c(2), and at 1.46 +/- 0.01 GeV/c(2), with width 0.105 +/- 0.015 GeV/c(2), is established. The lighter mass resonance decays mainly to K (K) over bar pi, possibly with final state interactions and a small contribution coming from a(0) pi. The higher mass 0(-+) state, which is seen for the first time in (p) over bar p annihilation at rest, decays only to K+(K) over bar. Masses, widths and decay modes are in agreement with the analysis of J/psi radiative decay performed by the Mark III Collaboration. From the fit the G-parity was determined to be +1. The dominant three-body decay mode of the lighter pseudoscalar is observed for the first time in this measurement.