A spin-parity analysis of a sample of 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 system in the wave shows also a signal corresponding to the axial vector f1(1420) decaying to 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 antiproton annihilation at rest in gaseous hydrogen at NTP with the OBELIX spectrometer / F., Nichitiu; 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., Rozhdestvensky; 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., Grasso; A., Maggiora; A., Panzarasa; D., Panzieri; F., Tosello; E., Botta; T., Bressani; D., Calvo; S., Costa; D., D'Isep; A., Feliciello; A., Filippi; S., Marcello; Agnello, Michelangelo; Iazzi, Felice; Minetti, Bruno; N., Mirfakhrai; S., Tessaro. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 545:3-4(2002), pp. 261-271. [10.1016/S0370-2693(02)02547-9]

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

AGNELLO, MICHELANGELO;IAZZI, Felice;MINETTI, Bruno;
2002

Abstract

A spin-parity analysis of a sample of 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 system in the wave shows also a signal corresponding to the axial vector f1(1420) decaying to 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).
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11583/1845789
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