The results of the analysis of 3940 (KKsr)wr events from a sample of 18 millions 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/c2, with width 0.050f0.004GeV/c2, andat 1.46+-0.01 GeV/c2, with width 0.105+-0.015 GeV/c2, is established. The lighter mass resonance decays mainly to Ki?n, possibly with final state interactions and a small contribution coming from mr. The higher mass O-+ state, which is seen for the first time in pp annihilation at rest, decays only to K*J?. 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.
E/iota decays to K anti-K pi in anti-p p annihilation at rest
FONTANA, ANDREA;MONTAGNA, PAOLO MARIA;ROTONDI, ALBERTO;
1995-01-01
Abstract
The results of the analysis of 3940 (KKsr)wr events from a sample of 18 millions 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/c2, with width 0.050f0.004GeV/c2, andat 1.46+-0.01 GeV/c2, with width 0.105+-0.015 GeV/c2, is established. The lighter mass resonance decays mainly to Ki?n, possibly with final state interactions and a small contribution coming from mr. The higher mass O-+ state, which is seen for the first time in pp annihilation at rest, decays only to K*J?. 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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
