E/IOTA DECAYS TO K(K)OVER-BAR-PI IN (P)OVER-BARP ANNIHILATION AT REST

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. RI Galli, Domenico/A-1606-2012; Iazzi, Felice/F-4490-2012; Botta, Elena/G-9742-2012; Villa, Mauro/C-9883-2009; Fontana, Andrea/I-4375-2012