TY - JOUR
T1 - Experimental study of the axial-vector resonances of a1 and h1 in the π-p charge exchange reaction
AU - Ando, A.
AU - Imai, K.
AU - Inaba, S.
AU - Inagaki, T.
AU - Inagaki, Y.
AU - Itano, A.
AU - Kobayashi, S.
AU - Murakami, A.
AU - Nakamura, T.
AU - Ohmi, K.
AU - Okuno, H.
AU - Sasaki, A.
AU - Sato, T.
AU - Shirai, J.
AU - Takamatsu, K.
AU - Takashima, R.
AU - Tamura, N.
AU - Tsuru, T.
AU - Yasu, Y.
PY - 1992/10/1
Y1 - 1992/10/1
N2 - 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.
AB - 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.
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U2 - 10.1016/0370-2693(92)91410-B
DO - 10.1016/0370-2693(92)91410-B
M3 - Article
AN - SCOPUS:0001086294
SN - 0370-2693
VL - 291
SP - 496
EP - 502
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
IS - 4
ER -