Chiral Perturbation Theory(?PT)is an effective theory to study the low energy dynamics of QCD and it is based on the global symmetry of QCD.As a consequence,the results from XPT are automatically consistent with the symmetries dictated by QCD.In this thesis,within the framework of the effective Lagrangian approach,we perform a thorough analysis of the J/?(?')?PV,J/?(?')? P?(?*),V?P?(?*),P?V?(?*)and P ???(?*)processes,where V stand for light vector resonances,P stand for light pseudoscalar mesons,and ?*decays into lepton pairs.It should be noted that the processes with light pseudoscalar mesons ? and ?' are studied within the two-mixing-angle scheme.By making a global fit of the above processes,we update the four mixing parameters,both in singlet-octet and quark-flavor bases,and discuss the interplay between electromagnetic and strong transitions in the J/?(?')? PV decays. |