A spin-parity analysis of a sample of (p) over barp --> K(+)K(-)pi(+)pi(-)pi(0) annihilation events taken at rest in gaseous H-2 at NTP is reported. The invariant mass spectrum of the K(+)K(-)n(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 +/- 0.002 and 1.460 +/- 0.012 GeV with widths 0.051 +/- 0.004 and 0.120 +/- 0.015 GeV, respectively. The (p) over barp system in the P-3(1) wave shows also a signal corresponding to the axial vector f(1) (1420) decaying to (KK)-K-* 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(-)pi(+)pi(-) system. The isobar decomposition of this resonant state is mainly f(0)(1370)(pipi)S, its parameters are: J(PC) = 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). (C) 2002 Elsevier Science B.V. All rights reserved.
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
DE FALCO, ALESSANDRO;PUDDU, GIOVANNA;USAI, GIANLUCA;
2002-01-01
Abstract
A spin-parity analysis of a sample of (p) over barp --> K(+)K(-)pi(+)pi(-)pi(0) annihilation events taken at rest in gaseous H-2 at NTP is reported. The invariant mass spectrum of the K(+)K(-)n(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 +/- 0.002 and 1.460 +/- 0.012 GeV with widths 0.051 +/- 0.004 and 0.120 +/- 0.015 GeV, respectively. The (p) over barp system in the P-3(1) wave shows also a signal corresponding to the axial vector f(1) (1420) decaying to (KK)-K-* 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(-)pi(+)pi(-) system. The isobar decomposition of this resonant state is mainly f(0)(1370)(pipi)S, its parameters are: J(PC) = 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). (C) 2002 Elsevier Science B.V. All rights reserved.
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