tau -> pi pi pi nu_tau decays and the a_1(1260) off-shell width revisited

Details tau -> pi pi pi nu_tau decays and the a_1(1260) off-shell width revisited tau -> pi pi pi nu_tau decays and the a_1(1260) off-shell width revisited

2009-11-23

arxiv.org/abs/0911.4436v2

Phys.Lett.B685:158-164,2010

Physics

High Energy Physics

High Energy Physics - Phenomenology

15 pages, 3 figures

Scientific paper

10.1016/j.physletb.2010.01.059

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-Nc expansion, this process has been studied in Ref.[1]. 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.

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