0000000000176614
AUTHOR
J. Portoles
tau -> pi pi pi nu(tau) decays and the a(1)(1260) off-shell width revisited
The tau -> pi pi pi nu(tau) decay is driven by the hadronization of the axial-vector current. Within the resonance chiral theory, and considering the large-N-C expansion, this process has been studied in Ref. [1] (D. Gomez Dumm, A. Pich, J. Portoles, 2004). In the light of later developments we revise here this previous work by including a new off-shell width for the lightest a(1) resonance that provides a good description of the tau -> pi pi pi nu(tau) spectrum and branching ratio. We also consider the role of the rho(1450) resonance in these observables. Thus we bring in an overall description of the tau -> pi pi pi nu(tau) process in excellent agreement with our present experimental know…
The Green function and SU(3) breaking in Kl3 decays
18 páginas, 1 figura, 1 tabla.-- arXiv:hep-ph/0503108v3
Phenomenology of the Green's function within the Resonance Chiral Theory
4 páginas, 1 figura.-- Comunicación presentada en la 10ª High-Energy International Conference on Quantum ChromoDynamics celebrada del 2 al 8 de Julio de 2003 en Montpellier (Francia).-- arXiv:hep-ph/0309345v1