Evidence for exotic J(PC)=1(-+) meson production in the reaction pi(-)p -> eta pi(-)p at 18 GeV/cстатья
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Аннотация:Details of the analysis of the eta pi(-) system studied in the reaction pi(-)p-->eta pi(-) p at 18 GeV/c are given. Separate analyses for the 2 gamma and pi(+) pi(-) pi(0) decay modes of the eta are presented. An amplitude analysis of the data indicates the presence of interference between the a(2)(-)(1320) and a J(PC) = 1(-+) wave between 1.2 and 1.6 GeV/c(2). The phase difference between these waves shows a phase motion not attributable solely to the a(2)(-)(1320). The data can be fitted by interference between the a(2)(-)(1320) and an exotic 1(-+) resonance with M = (1370+/-16(-30)(+50)) MeV/c(2) and Gamma = (385+/-40(-105)(+65)) MeV/c(2). Our results are compared with those of other experiments. [S0556-2821(99)06119-6].