Details of the analysis of the ηπ- system studied in the reaction π-p→ηπ-p at 18 GeV/c are given. Separate analyses for the 2γ and π+π-π0 decay modes of the η are presented. An amplitude analysis of the data indicates the presence of interference between the a2-(1320) and a JPC=1-+ wave between 1.2 and 1.6 GeV/c2. The phase difference between these waves shows a phase motion not attributable solely to the a2-(1320). The data can be fitted by interference between the a2-(1320) and an exotic 1-+ resonance with M=(1370±16-30+50) MeV/c2 and Γ=(385±40-105+65) MeV/c2. Our results are compared with those of other experiments.
|Original language||English (US)|
|Number of pages||24|
|Journal||Physical Review D - Particles, Fields, Gravitation and Cosmology|
|State||Published - Nov 1 1999|
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)