E ι decay to KKπ in pp annihilation at rest

A. Bertin, M. Bruschi, B. Cereda, S. De Castro, A. Ferretti, D. Galli, B. Giacobbe, U. Marconi, M. Poli, M. Piccinini, N. Semprini-Cesari, R. Spighi, S. Vecchi, A. Vezzani, F. Vigotti, M. Villa, A. Vitale, A. Zoccoli, M. Corradini, A. DonzellaE. Lodi Rizzini, L. Venturelli, A. Zenoni, C. Cicaló, A. Lai, A. Masoni, L. Musa, G. Puddu, S. Serci, P. P. Temnikov, G. Usai, V. G. Ableev, O. Yu Denisov, A. M. Rozhdestvensky, M. G. Sapozhnikov, V. I. Tretyak, P. Gianotti, C. Guaraldo, A. Lanaro, V. Lucherini, F. Nichitiu, C. Petrascu, A. Rosca, C. Cavion, U. Gastaldi, G. Maron, M. Morando, G. Bendiscioli, V. Filippini, A. Fontana, P. Montagna, A. Rotondi, A. Saino, P. Salvini, F. Balestra, E. Botta, T. Bressani, M. P. Bussa, L. Busso, D. Calvo, P. Cerello, S. Costa, A. Feliciello, L. Ferrero, A. Filippi, R. Garfagnini, A. Grasso, A. Maggiora, S. Marcello, N. Mirfakhrai, D. Panzieri, D. Parena, E. Rossetto, F. Tosello, G. Zosi, M. Agnello, F. Iazzi, B. Minetti, G. Pauli, S. Tessaro, L. Santi

Research output: Contribution to journalArticlepeer-review

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 J Ψ 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.

Original languageEnglish
Pages (from-to)187-198
Number of pages12
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume361
Issue number1-4
DOIs
Publication statusPublished - 2 Nov 1995
Externally publishedYes

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