Study of the $K^{+}K^{-} \pi^{+}\pi^{-}\pi^{0}$ final state in antiproton annihilation at rest in gaseous hydrogen at NTP with the OBELIX spectrometer

A spin-parity analysis of a sample of pp to K/sup +/K/sup -/ pi /sup +/ pi /sup -/ pi /sup 0/ annihilation events taken at rest in gaseous H/sub 2/ at NTP is reported. The invariant mass spectrum of the K/sup +/K/sup -/ pi /sup 0/ system shows the presence of the E/t resonance pattern at 1.42 GeV. T...

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Detalles Bibliográficos
Autores principales: Nichitiu, F, Agnello, M, Balestra, F, Bertin, A, Bonomi, G, Botta, E, Bressani, Tullio, Bruschi, M, Bussa, M P, Busso, L, Calvo, D, Capponi, M, Cerello, P G, Cicalò, C, Costa, S, D'Isep, D, De Castro, S, De Galco, A, Denisov, O, Donzella, A, Feliciello, A, Filippi, A, Filippini, V, Fontana, A, Galli, D, Garfagnini, R, Giacobbe, B, Gianotti, P, Gorchakov, O E, Grasso, A, Guaraldo, C, Iazzi, F, Lanaro, A, Lodi-Rizzini, E, Lucherini, V, Maggiora, A, Marcello, S, Marconi, U, Masoni, A, Massa, I, Mauro, S, Minetti, B, Mirfakhraee, N, Montagna, P, Panzarasa, A, Panzieri, D, Petrascu, C, Piccinini, M, Poli, M, Prakhov, S N, Puddu, G, Rosca, A, Rotondi, A, Rozhdestvensky, A M, Salvini, P, Semprini-Cesari, N, Spighi, R, Tessaro, S, Tosello, F, Tretyak, V I, Usai, G L, Vagnoni, V M, Vecchi, S, Venturelli, L, Villa, M, Vitale, A, Zenoni, A, Zoccoli, A
Lenguaje:eng
Publicado: 2002
Materias:
Particle Physics - Experiment
Acceso en línea:https://dx.doi.org/10.1016/S0370-2693(02)02547-9
http://cds.cern.ch/record/722164
Descripción
Sumario:A spin-parity analysis of a sample of pp to K/sup +/K/sup -/ pi /sup +/ pi /sup -/ pi /sup 0/ annihilation events taken at rest in gaseous H/sub 2/ at NTP is reported. The invariant mass spectrum of the K/sup +/K/sup -/ pi /sup 0/ system shows the presence of the E/t 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+or-0.002 and 1.460+or-0.012 GeV with widths 0.051+or-0.004 and 0.120+or-0.015 GeV, respectively. The pp system in the /sup 3/P/sub 1/ wave shows also a signal corresponding to the axial vector f/sub 1/ (1420) decaying to K*K with mass 1.420+or-0.003 GeV and width 0.061+or-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/sup +/K /sup -/ pi /sup +/ pi /sup -/ system. The isobar decomposition of this resonant state is mainly f/sub 0/(1370)( pi pi )/sub S/, its parameters are: J/sup PC/=0/sup ++/, m=1.670+or-0.02 GeV and width 0.267+or-0.036 GeV. This signal can be probably identified with another decay mode of the f/sub 0/(1710). (24 refs).

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