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Título

Tau -> pi pi pi nu(tau) decays and the a(1)(1260) off-shell width revisited

AutorPich, Antonio ; Portolés, Jorge ; Roig, Pablo ; Gómez Dumm, D.
Palabras claveHadron tau decays
Chiral Lagrangians
1/N Expansion
QCD
Fecha de publicación1-mar-2010
EditorElsevier
CitaciónPhysics Letters - Section B 685 (2-3): 158-164 (2010)
ResumenThe 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 knowledge.
Versión del editorhttp://dx.doi.org/ 10.1016/j.physletb.2010.01.059
URIhttp://hdl.handle.net/10261/23200
DOI10.1016/j.physletb.2010.01.059
ISSN0370-2693
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