Resonance Chiral Lagrangian analysis of τ<SUP>-</SUP>→η<SUP>(′)</SUP>π<SUP>-</SUP>π<SUP>0</SUP>ν<SUB>τ</SUB>

The hadronization structure of τ<SUP>-</SUP>→η<SUP>(′)</SUP>π<SUP>-</SUP>π<SUP>0</SUP>ν<SUB>τ</SUB> decays is analyzed using chiral perturbation theory with resonances, considering only the contribution of the lightest meson resonances at l...

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Detalles Bibliográficos
Autores principales:	Gómez Dumm, Daniel Alberto, Roig, P.
Formato:	Articulo
Lenguaje:	Inglés
Publicado:	2012
Materias:	Física Quantum chromodynamics Chiral symmetry Decays of the tau lepton
Acceso en línea:	http://sedici.unlp.edu.ar/handle/10915/96144 https://ri.conicet.gov.ar/11336/74540 https://journals.aps.org/prd/abstract/10.1103/PhysRevD.86.076009
Aporte de:	SEDICI (UNLP) de Universidad Nacional de La Plata

Descripción
Sumario:	The hadronization structure of τ<SUP>-</SUP>→η<SUP>(′)</SUP>π<SUP>-</SUP>π<SUP>0</SUP>ν<SUB>τ</SUB> decays is analyzed using chiral perturbation theory with resonances, considering only the contribution of the lightest meson resonances at leading order in the 1/N C expansion. After imposing the asymptotic behavior of vector spectral functions ruled by QCD, unknown effective couplings are determined by fitting the τ<SUP>-</SUP>→η<SUP>(′)</SUP>π<SUP>-</SUP>π<SUP>0</SUP>ν<SUB>τ</SUB> branching ratio and decay spectrum to recent data. Predictions for the partner decay τ<SUP>-</SUP>→η<SUP>(′)</SUP>π<SUP>-</SUP>π<SUP>0</SUP>ν<SUB>τ</SUB> and the low-energy behavior of the cross section σ(e+e -→ηπ +π -) are also discussed.