A high-statistics experiment on the reaction π-p→π+π-π0n at 8.06 GeV/c has been performed using a spectrometer detecting both charged particles and gamma rays. A partial-wave analysis based on the isobar model has been carried out for π+π-π0 data in the mass range between 0.86 and 1.50 GeV for four t′ regions: 0.0-0.1, 0.1-0.25, 0.25-0.45 and 0.45-0.95 (GeV/c2). Two axial-vector resonances, a1(1260) and h1(1170), were observed in the analysis. The masses and widths of a1 and h1 were determined to be M(a1 = 1121 ± 8 MeV, Λ(a1 = 239± 11 MeV, M(h1 = 1168±4 MeV and Λ(h1 = 345±6 MeV, respectively, by fitting the Breit-Wigner formula to the partial wave amplitude. A fit including the Deck type background was also tried in each t′ region. The results showed a small effect on these resonance parameters and were consistent with those obtained by the simple Breit-Wigner fitting.
ASJC Scopus subject areas
- Nuclear and High Energy Physics