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Title

tau -> (3 pions) nu_tau decays in the Resonance Effective Theory

AuthorsGómez Dumm, D.; Pich, Antonio CSIC ORCID; Portolés, Jorge CSIC ORCID
Issue DateApr-2004
PublisherAmerican Physical Society
CitationPhysical review D 69(7): 073002 (2004)
Abstracttau -> (3 pions) nu_tau decays are analysed within the framework of the resonance effective theory of QCD. We work out the relevant Lagrangian that describes the axial-vector current hadronization contributing to these processes, in particular the local a_1(1260)-rho(770)-Goldstone interactions. The new coupling constants are constrained by imposing the asymptotic behaviour of the corresponding spectral function within QCD. Hence we compare the theoretical framework with the experimental data, obtaining a good quality fit from the ALEPH spectral function and branching ratio. We also get values for the mass and on-shell width of the a_1(1260) resonance. In this way we are able to provide the structure functions that have been measured by OPAL and CLEO-II and we find an excellent agreement.
Description13 páginas, 7 figuras, 1 tabla.-- PACS number(s): 13.35.Dx, 11.30.Rd, 11.40.2q, 14.60.Fg.
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevD.69.073002
URIhttp://hdl.handle.net/10261/33113
DOI10.1103/PhysRevD.69.073002
ISSN0556-2821
Appears in Collections:(IFIC) Artículos

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