Three channel model of meson-meson scattering and scalar meson spectroscopy

• Published in: Physics letters. B Vol. 413; no. 1; pp. 130 - 136
• Main Authors: Kamiński, R., Leśniak, L., Loiseau, B.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 06-11-1997; Elsevier
• ISSN: 0370-2693; 1873-2445
• DOI: 10.1016/S0370-2693(97)01090-3

New solutions on the scalar-isoscalar ππ phase shifts are analysed together with previous
K
K
results using a separable potential model of three coupled channels (ππ,
K
K
and an effective 2π2π system). Model parameters are fitted to two sets of solutions obtained in a recent analysis of the CERN-Cracow-Munich measurements of the
π
−
p
↑ →
π
+
π
−
n reaction on a polarized target. A relatively narrow (90–180 MeV) scalar resonance
f
0(1400–1460) is found, in contrast to a much broader (Γ ≈ 500 MeV) state emerging from the analysis of previous unpolarized target data.