期刊
PHYSICS LETTERS B
卷 685, 期 2-3, 页码 158-164出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physletb.2010.01.059
关键词
Hadron tau decays; Chiral Lagrangians; QCD; 1/N expansion
资金
- FPU
- DFG cluster of excellence 'Origin and Structure of the Universe'
- Marie Curie ESR
- EU [MRTN-CT-2006-035482]
- MEC (Spain) [FPA2007-60323]
- Spanish Consolider-Ingenio 2010 Programme CPAN [CSD2007-00042]
- Generalitat Valenciana [PROM ETEO/2008/069]
- CONICET
- ANPCyT (Argentina) [PIP6009, PIP02495, PICT04-03-25374, PICT07-03-00818]
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. (c) 2010 Elsevier B.V. All rights reserved.
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