τ → πππντ decays and the a1(1260) off-shell width revisited

被引：85

作者：

Gomez Dumm, D. ^{[2
]}

Roig, P. ^{[3
]}

Pich, A. ^{[1
]}

Portoles, J. ^{[1
]}

机构：

[1] Univ Valencia, CSIC, Dept Fis Teor, IFIC, E-46071 Valencia, Spain

[2] Univ Nacl La Plata, Dpto Fis, CONICET, IFLP, RA-1900 La Plata, Argentina

[3] Univ Paris 11, Phys Theor Lab, UMR 8627, F-91405 Orsay, France

来源：

PHYSICS LETTERS B | 2010年 / 685卷 / 2-3期

关键词：

Hadron tau decays; Chiral Lagrangians; QCD; 1/N expansion; CHIRAL PERTURBATION-THEORY; HADRONIC DECAYS; FORM-FACTORS; SUM-RULES; LEPTON; CONSTANTS; CURRENTS; VECTOR; PION;

D O I：

10.1016/j.physletb.2010.01.059

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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.

引用

页码：158 / 164

页数：7

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