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Pacetti, S.
The European physical journal. A, Hadrons and nuclei, 12/2008, Letnik: 38, Številka: 3Journal Article
A method to determine masses, widths and coupling constants of vector mesons, like (1020) , (782) and (770) recurrences is defined. Starting from data on decay rates and cross-sections for the processes: → M I , → M I e + e - and e + e - → M I , where M I is a pseudoscalar or scalar meson with isospin I = 0, 1 , the time-like transition form factors, which describe the vertex M I , are parameterized using a vector-meson-propagators description in the low-energy region ( < 3-4 GeV), the quark-counting rule prescription for the high-energy behavior, and the analyticity imposed by means of the dispersion relations.
