PT Journal
AU Gomez Dumm, D
   Roig, P
   Pich, A
   Portoles, J
TI tau -> pi pi pi nu(tau) decays and the a(1)(1260) off-shell width revisited
SO Physics Letters B
JI Phys. Lett. B
PY 2010
BP 158
EP 164
VL 685
IS 2-3
DI 10.1016/j.physletb.2010.01.059
LA English
DE Hadron tau decays; Chiral Lagrangians; QCD; 1/N expansion
AB 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 knowledge.
ER