A practical guide to unravel time-like transition form factors

Details A practical guide to unravel time-like transition form factors A practical guide to unravel time-like transition form factors

2008-07-09

arxiv.org/abs/0807.1399v1

Eur.Phys.J.A38:331-343,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

20 pages, 15 eps figures

Scientific paper

10.1140/epja/i2008-10668-4

A method to determine masses, widths and coupling constants of vector mesons, like phi(1020), omega(782) and rho0(770) recurrences is defined. Starting from data on decay rates and cross sections for the processes: phi -> M_I gamma, phi -> M_I e+e- and e+e- -> M_I phi, where M_I is a pseudoscalar or scalar meson with isospin I=0,1, the time-like transition form factors, which describe the vertex phi-gamma-M_I, are parametrized 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.

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