Pion and kaon electromagnetic form factors in a SU_L(3) direct X SU_R(3) effective Lagrangian

摘要

A SU(2) effective Lagrangian is extended to a SU_L(3) direct X SU_R(3) by including the vector and axial vector meson. With this effective Lagrangian, electromagnetic form factors of charged pion and kaon are calculated in both time- and space-like regions. The pseudoscalar meson loops are taken into account. Good agreement with experimental data is obtained for those form factors and charged pseudoscalar meson radii. Decay widths of ρ → ππ and φ → K~+K~- are also calculated and shown to agree with experimental data very well.