The <f>κ</f> resonance in <f>s</f> wave <f>πK</f> scatterings

A new unitarization approach incorporated with chiral symmetry is established and applied to study the <f>πK</f> elastic scatterings. We demonstrate that the <f>κ</f> resonance exists, if the scattering length parameter in the <f>I=1/2</f>, <f>J=0</f> channel does not deviate much from its value predicted by chiral perturbation theory. The mass and width of the <f>κ</f> resonance is found to be <f>Mκ=594±79</f> MeV, <f>Γκ=724±332</f> MeV, obtained by fitting the LASS data up to 1430 MeV. Better determination to the pole parameters is possible if the chiral predictions on scattering lengths are taken into account. [Copyright &y& Elsevier]