Author/Authors :
OBELIX Collaboration، نويسنده , , A. Bertin، نويسنده , , Simone M. Bruschi، نويسنده , , B. Cereda، نويسنده , , S. De Castro، نويسنده , , A. Ferretti، نويسنده , , D. Galli، نويسنده , , B. Giacobbe، نويسنده , , U. Marconi، نويسنده , , M. Poli، نويسنده , , M. Piccinini، نويسنده , , N. Semprini-Cesari، نويسنده , , R. Spighi، نويسنده , , S. Vecchi، نويسنده , , A. Vezzani، نويسنده , , F. Vigotti، نويسنده , , M. Villa، نويسنده , , A. Vitale، نويسنده , , A. Zoccoli، نويسنده , , M. Corradini، نويسنده , , et al.، نويسنده ,
Abstract :
The results of the analysis of 3940 (KKπ)ππ events from a sample of 18 millions pp annihilations in the liquid hydrogen target of the OBELIX spectrometer at LEAR (CERN) are presented. The presence of two pseudoscalar states at 1.416±0.002GeV/c2, with width 0.050±0.004GeV/c2, and at 1.46±0.01GeV/c2, with width 0.105±0.015GeV/c2, is established. The lighter mass resonance decays mainly to KKπ, possibly with final state interactions and a small contribution coming from a0π. The higher mass 0−+ state, which is seen for the first time in pp annihilation at rest, decays only to K∗K. Masses, widths and decay modes are in agreement with the analysis of JΨ 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.
