The Hadronic off-shell width of meson resonances

DANIEL GOMEZ DUMM; ANTONIO PICH; JORGE PORTOLES

PHYSICAL REVIEW D - PARTICLE AND FILDS

The American Physical Society

Lugar: Ridge, N. Y.; Año: 2000 vol. 62 p. 54014 - 54014

0556-2821

Within the resonance chiral effective theory we study the dressed propagators of the spin-1 fields, which arise from a Dyson-Schwinger resummation perturbatively constructed from loop diagrams with absorptive contributions in the s channel. We apply the procedure to the vector pion form factor and elastic pi - pi scattering to obtain the off-shell width of the  rho0  meson. We adopt a definition of the off-shell width of spin-1 meson resonances that satisfies the requirements of analyticity, unitarity, chiral symmetry, and asymptotic behavior ruled by QCD. To satisfy these constraints the resummation procedure cannot consist only of self-energy diagrams. Our width definition is shown to be independent of the formulation used to describe the spin-1 meson resonances.