A spin-parity analysis of a sample of Image annihilation events taken at rest in gaseous H2 at NTP is reported. The invariant mass spectrum of the K+K−π0 system shows the presence of the E/ι resonance pattern at 1.42 GeV. The analysis of this signal confirms the results obtained by the OBELIX Collaboration in previous works, namely: the existence of two pseudoscalar states at 1.413 ± 0.002 and 1.460±0.012 GeV with widths 0.051 ± 0.004 and 0.120±0.015 GeV, respectively. The Image system in the 3P1 wave shows also a signal corresponding to the axial vector f1(1420) decaying to Image with mass 1.420±0.003 GeV and width 0.061±0.005 GeV. A study of the incoherent phase space background shows that its origin is mostly due to the reflection of a resonant state in the K+K−π+π− system. The isobar decomposition of this resonant state is mainly f0(1370)(ππ)S, its parameters are: JPC=0++, m=1.670±0.02 GeV and width 0.267±0.036 GeV. This signal can be probably identified with another decay mode of the f0(1710).

Study of the K+ K- pi+ pi- pi0 final state in anti-proton annihilation at rest in gaseous hydrogen at NTP with the OBELIX spectrometer.

GRASSO, Antonino;MARCELLO, Simonetta;BUSSA, Maria Pia;BALESTRA, Ferruccio;BUSSO, Luigi;GARFAGNINI, Raffaello;PANZIERI, Daniele;BOTTA, Elena;BRESSANI, Tullio;COSTA, Sergio;
2002-01-01

Abstract

A spin-parity analysis of a sample of Image annihilation events taken at rest in gaseous H2 at NTP is reported. The invariant mass spectrum of the K+K−π0 system shows the presence of the E/ι resonance pattern at 1.42 GeV. The analysis of this signal confirms the results obtained by the OBELIX Collaboration in previous works, namely: the existence of two pseudoscalar states at 1.413 ± 0.002 and 1.460±0.012 GeV with widths 0.051 ± 0.004 and 0.120±0.015 GeV, respectively. The Image system in the 3P1 wave shows also a signal corresponding to the axial vector f1(1420) decaying to Image with mass 1.420±0.003 GeV and width 0.061±0.005 GeV. A study of the incoherent phase space background shows that its origin is mostly due to the reflection of a resonant state in the K+K−π+π− system. The isobar decomposition of this resonant state is mainly f0(1370)(ππ)S, its parameters are: JPC=0++, m=1.670±0.02 GeV and width 0.267±0.036 GeV. This signal can be probably identified with another decay mode of the f0(1710).
2002
545
261
271
A. GRASSO; F. NICHITIU, S. MARCELLO; P. Gianotti; C. Guaraldo, A. Lanaro, V. Lucherini, C. Petrascu, A. Rosca, G. Bonomi, M. P. Bussa, A. Donzella, E. Lodi Rizzini, L. Venturelli, A. Zenoni, A. Bertin, M. Bruschi, M. Capponi, S. De Castro, D. Galli, B. Giacobbe, U. Marconi, I. Massa, M. Piccinini, N. Semprini-Cesari, R. Spighi, S. Vecchi, V. Vagnoni, M. Villa, A. Vitale, A. Zoccoli, C. Cicalò, A. De Falco, A. Masoni, S. Mauro, G. Puddu, G. Usai, O. E. Gorchakov, S. N. Prakhov, A. M. Rozhdestvenske, V. I. Tretyak, M. Poli, V. Filippini, A. Fontana, P. Montagna, A. Rotondi, P. Salvini, F. Balestra, L. Busso, P. Cerello, O. Denisov, R. Garfagnini, A. Maggiora, A. Panzarasa, D. Panzieri, F. Tosello, E. Botta, T. Bressani, D. Calvo, S. Costa, D. D'Isep, A. Feliciello, A. Filippi, M. Agnello, F. Iazzi, B. Minetti, N. Mirfakhrai; S. Tessaro
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/36759
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