Experimental study of the axial-vector resonances of a1 and h1 in the π-p charge exchange reaction

A. Ando, K. Imai, S. Inaba, T. Inagaki, Y. Inagaki, A. Itano, S. Kobayashi, A. Murakami, T. Nakamura, K. Ohmi, H. Okuno, A. Sasaki, T. Sato, J. Shirai, K. Takamatsu, R. Takashima, N. Tamura, T. Tsuru, Y. Yasu

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8 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)496-502
Number of pages7
JournalPhysics Letters B
Issue number4
Publication statusPublished - 1992 Oct 1
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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