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

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

2003-12-15

arxiv.org/abs/hep-ph/0312183v1

Phys.Rev.D69:073002,2004

Physics

High Energy Physics

High Energy Physics - Phenomenology

24 pages, 7 figures

Scientific paper

10.1103/PhysRevD.69.073002

tau -> (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.

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