Artículo
Dispersive representation of the pion vector form factor in τ→ππν τ decays
Fecha de publicación:
08/2013
Editorial:
Springer
Revista:
European Physical Journal C: Particles and Fields
ISSN:
1434-6044
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
We propose a dispersive representation of the charged pion vector form factor that is consistent with chiral symmetry and fulfills the constraints imposed by analyticity and unitarity. Unknown parameters are fitted to the very precise data on τ-→π- π0 ντ decays obtained by Belle, leading to a good description of the corresponding spectral function up to a ππ squared invariant mass s≃1.5 GeV2. We determine the ρ(770) mass and width pole parameters and obtain the values of low-energy observables. The significance of isospin-breaking corrections is also discussed. For larger values of s, this representation is complemented with a phenomenological description to allow its implementation in the new TAUOLA hadronic currents.
Palabras clave:
Tau Lepton Decays
,
Chiral Symmetry
,
Vector Meson Physics
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Articulos(IFLP)
Articulos de INST.DE FISICA LA PLATA
Articulos de INST.DE FISICA LA PLATA
Citación
Gomez Dumm, Daniel Alberto; Roig, P.; Dispersive representation of the pion vector form factor in τ→ππν τ decays; Springer; European Physical Journal C: Particles and Fields; 73; 8; 8-2013; 2528-2528
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