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남승일,Hyun-Chul Kim,Atsushi Hosaka,Daisuke Jido,Tetsuo Hyodo 한국물리학회 2004 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.45 No.3
We investigate the dependences of the s-wave meson-baryon scattering amplitudes on dierent regularizations within the framework of the chiral unitary model. We employ two dierent regularization schemes, i.e., dimensional and form-factor regularizations, to tame the divergences in the model. We also use those regularization schemes to study the analytic structures of the T-matrices. We nd that while the form-factor regularizaion produces almost the same results as the dimensional regularization does, the on-shell approximation is to some extent limited in the case of the form-factor regularization. Having chosen parameters properly, we show that the regularization dependences can be minimized.