The results of a search for a possible evidence of a pi (+)pi (+) resonant state in the (n) over barp --> pi (+)pi (+)pi (-) annihilation reaction with data collected by the OBELIX Experiment are presented. The study has been performed by means of a partial wave analysis in the frame of the isobar model. Production fractions for a possible pi (+)pi (+) resonance have been evaluated. The observed effects at the pi (+)pi (+) threshold may be described reasonably well by the contributions of f(2)(1270), f(0)(1500), f(2)(1565) and rho (1450) states and their interferences, but a meaningful statistical indication for a pi (+)pi (+) scalar state at about 1400 MeV emerges from the analysis. (C) 2000 Published by Elsevier Science B.V.

An analysis of the contribution of isospin two pi pi resonant states in the (n)over-barp -> pi(+)pi(+)pi(-) annihilation reaction

DE FALCO, ALESSANDRO;USAI, GIANLUCA;
2000

Abstract

The results of a search for a possible evidence of a pi (+)pi (+) resonant state in the (n) over barp --> pi (+)pi (+)pi (-) annihilation reaction with data collected by the OBELIX Experiment are presented. The study has been performed by means of a partial wave analysis in the frame of the isobar model. Production fractions for a possible pi (+)pi (+) resonance have been evaluated. The observed effects at the pi (+)pi (+) threshold may be described reasonably well by the contributions of f(2)(1270), f(0)(1500), f(2)(1565) and rho (1450) states and their interferences, but a meaningful statistical indication for a pi (+)pi (+) scalar state at about 1400 MeV emerges from the analysis. (C) 2000 Published by Elsevier Science B.V.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11584/109258
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