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Title

Hadronic off-shell width of meson resonances

AuthorsGómez Dumm, D.; Pich, Antonio CSIC ORCID; Portolés, Jorge CSIC ORCID
Issue DateJul-2000
PublisherAmerican Physical Society
CitationPhysical review D 62(5): 054014 (2000)
AbstractWithin 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 ππ scattering to obtain the off-shell width of the ρ0 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.
Description6 páginas, 4 figuras.-- PACS number(s): 12.39.Fe, 12.38.Aw, 12.38.Cy, 12.40.Vv
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevD.62.054014
URIhttp://hdl.handle.net/10261/33207
DOI10.1103/PhysRevD.62.054014
ISSN0556-2821
Appears in Collections:(IFIC) Artículos




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